From 8a734d58d9cd7dda46e5c7402335a817d9225b60 Mon Sep 17 00:00:00 2001
From: Gregor Klevze <gregor@klevze.si>
Date: Sat, 15 Aug 2026 17:59:18 +0200
Subject: [PATCH] Add Shorts wizard and v4 video-style pipeline

Turn the Shorts tab into a step-by-step wizard and port
amigadb-short-fx-v4.sh: Video background style, auto/manual crop,
source fade-in, and blur/opacity/margin settings.
---
 AmiReel.Tests/Models/ShortWizardTests.cs      |  92 ++
 AmiReel.Tests/Services/ShortsPipelineTests.cs | 169 ++++
 App.xaml                                      |   6 +
 MainPage.xaml                                 | 332 ++++---
 MainPage.xaml.cs                              | 268 +++++-
 Models/AppSettings.cs                         |  20 +
 Models/ShortSettings.cs                       |  22 +-
 Models/ShortWizard.cs                         |  63 ++
 Services/ShortsPipeline.cs                    | 180 +++-
 amigadb-short-fx-v4.sh                        | 904 ++++++++++++++++++
 10 files changed, 1911 insertions(+), 145 deletions(-)
 create mode 100644 AmiReel.Tests/Models/ShortWizardTests.cs
 create mode 100644 Models/ShortWizard.cs
 create mode 100644 amigadb-short-fx-v4.sh

diff --git a/AmiReel.Tests/Models/ShortWizardTests.cs b/AmiReel.Tests/Models/ShortWizardTests.cs
new file mode 100644
index 0000000..c8719cd
--- /dev/null
+++ b/AmiReel.Tests/Models/ShortWizardTests.cs
@@ -0,0 +1,92 @@
+using AmiReel.Models;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace AmiReel.Tests.Models;
+
+[TestClass]
+public class ShortWizardTests
+{
+    [TestMethod]
+    public void StepsFor_BrandStyle_IncludesEffectSettingsPage()
+    {
+        // Act
+        IReadOnlyList<ShortWizardStep> steps = ShortWizard.StepsFor(ShortStyle.Brand);
+
+        // Assert
+        CollectionAssert.AreEqual(
+            new[]
+            {
+                ShortWizardStep.Clip,
+                ShortWizardStep.Effect,
+                ShortWizardStep.StyleOptions,
+                ShortWizardStep.Titles,
+                ShortWizardStep.Encode,
+            },
+            steps.ToArray());
+    }
+
+    [TestMethod]
+    public void StepsFor_VideoStyle_IncludesEffectSettingsPage()
+    {
+        // Act
+        IReadOnlyList<ShortWizardStep> steps = ShortWizard.StepsFor(ShortStyle.Video);
+
+        // Assert
+        Assert.IsTrue(steps.Contains(ShortWizardStep.StyleOptions));
+        Assert.AreEqual(5, steps.Count);
+    }
+
+    [TestMethod]
+    public void StepsFor_CropStyle_SkipsEffectSettingsPage()
+    {
+        // Act
+        IReadOnlyList<ShortWizardStep> steps = ShortWizard.StepsFor(ShortStyle.Crop);
+
+        // Assert
+        CollectionAssert.AreEqual(
+            new[]
+            {
+                ShortWizardStep.Clip,
+                ShortWizardStep.Effect,
+                ShortWizardStep.Titles,
+                ShortWizardStep.Encode,
+            },
+            steps.ToArray());
+    }
+
+    [TestMethod]
+    public void NeedsStyleOptions_OnlyBrandAndVideo_ReturnsTrue()
+    {
+        // Assert
+        Assert.IsTrue(ShortWizard.NeedsStyleOptions(ShortStyle.Brand));
+        Assert.IsTrue(ShortWizard.NeedsStyleOptions(ShortStyle.Video));
+        Assert.IsFalse(ShortWizard.NeedsStyleOptions(ShortStyle.Pixel));
+        Assert.IsFalse(ShortWizard.NeedsStyleOptions(ShortStyle.Spectrum));
+    }
+
+    [TestMethod]
+    public void Description_ForEveryStyle_IsNonEmpty()
+    {
+        foreach (ShortStyle style in Enum.GetValues<ShortStyle>())
+        {
+            // Act
+            string description = ShortWizard.Description(style);
+
+            // Assert
+            Assert.IsFalse(string.IsNullOrWhiteSpace(description), $"{style} is missing a description.");
+        }
+    }
+
+    [TestMethod]
+    public void Title_ForEveryStep_IsNonEmpty()
+    {
+        foreach (ShortWizardStep step in Enum.GetValues<ShortWizardStep>())
+        {
+            // Act
+            string title = ShortWizard.Title(step);
+
+            // Assert
+            Assert.IsFalse(string.IsNullOrWhiteSpace(title), $"{step} is missing a title.");
+        }
+    }
+}
diff --git a/AmiReel.Tests/Services/ShortsPipelineTests.cs b/AmiReel.Tests/Services/ShortsPipelineTests.cs
index 941f950..59deb24 100644
--- a/AmiReel.Tests/Services/ShortsPipelineTests.cs
+++ b/AmiReel.Tests/Services/ShortsPipelineTests.cs
@@ -186,6 +186,74 @@ public class ShortsPipelineTests
         ShortsPipeline.Validate(settings);
     }
 
+    [TestMethod]
+    public void Validate_VideoStyleWithoutBackgroundVideo_ThrowsFileNotFoundException()
+    {
+        // Arrange
+        string directory = CreateTempDirectory();
+        string input = Path.Combine(directory, "clip.mp4");
+        File.WriteAllText(input, "data");
+        string font = Path.Combine(directory, "font.ttf");
+        File.WriteAllText(font, "data");
+        ShortSettings settings = ValidSettings(input, font, ShortStyle.Video);
+
+        // Act & Assert
+        Assert.ThrowsExactly<FileNotFoundException>(() => ShortsPipeline.Validate(settings));
+    }
+
+    [TestMethod]
+    public void Validate_VideoStyleWithBackgroundVideo_DoesNotThrow()
+    {
+        // Arrange
+        string directory = CreateTempDirectory();
+        string input = Path.Combine(directory, "clip.mp4");
+        File.WriteAllText(input, "data");
+        string font = Path.Combine(directory, "font.ttf");
+        File.WriteAllText(font, "data");
+        string background = Path.Combine(directory, "bg.mp4");
+        File.WriteAllText(background, "data");
+        ShortSettings settings = ValidSettings(input, font, ShortStyle.Video) with { BackgroundVideo = background };
+
+        // Act & Assert (no exception)
+        ShortsPipeline.Validate(settings);
+    }
+
+    [TestMethod]
+    public void Validate_VideoOpacityAboveOne_ThrowsArgumentException()
+    {
+        // Arrange
+        string directory = CreateTempDirectory();
+        string input = Path.Combine(directory, "clip.mp4");
+        File.WriteAllText(input, "data");
+        string font = Path.Combine(directory, "font.ttf");
+        File.WriteAllText(font, "data");
+        string background = Path.Combine(directory, "bg.mp4");
+        File.WriteAllText(background, "data");
+        ShortSettings settings = ValidSettings(input, font, ShortStyle.Video) with
+        {
+            BackgroundVideo = background,
+            VideoOpacity = 1.2,
+        };
+
+        // Act & Assert
+        Assert.ThrowsExactly<ArgumentException>(() => ShortsPipeline.Validate(settings));
+    }
+
+    [TestMethod]
+    public void Validate_SourceMarginTooWide_ThrowsArgumentException()
+    {
+        // Arrange
+        string directory = CreateTempDirectory();
+        string input = Path.Combine(directory, "clip.mp4");
+        File.WriteAllText(input, "data");
+        string font = Path.Combine(directory, "font.ttf");
+        File.WriteAllText(font, "data");
+        ShortSettings settings = ValidSettings(input, font) with { SourceMarginX = 540 };
+
+        // Act & Assert
+        Assert.ThrowsExactly<ArgumentException>(() => ShortsPipeline.Validate(settings));
+    }
+
     [TestMethod]
     public void GetBaseFilter_ForEveryStyle_ReturnsAFilterEndingInBaseTag()
     {
@@ -220,4 +288,105 @@ public class ShortsPipelineTests
         StringAssert.Contains(result, "enable='gte(t,26.5)'");
         StringAssert.Contains(result, "[vout]");
     }
+
+    [TestMethod]
+    public void GetBaseFilter_VideoStyle_UsesBackgroundVideoInput()
+    {
+        // Act
+        string filter = ShortsPipeline.GetBaseFilter(ShortStyle.Video);
+
+        // Assert
+        StringAssert.Contains(filter, "[1:v]");
+        StringAssert.Contains(filter, "colorchannelmixer=aa=1");
+        StringAssert.Contains(filter, "[base]");
+        Assert.IsFalse(filter.Contains("gblur=", StringComparison.Ordinal));
+    }
+
+    [TestMethod]
+    public void BuildVideoBaseFilter_WithBlur_InsertsGblur()
+    {
+        // Act
+        string filter = ShortsPipeline.BuildVideoBaseFilter(
+            "crop=iw:ih:0:0", "scale=1000:-2:flags=lanczos", blur: 8, opacity: 0.65);
+
+        // Assert
+        StringAssert.Contains(filter, "gblur=sigma=8");
+        StringAssert.Contains(filter, "colorchannelmixer=aa=0.65");
+        StringAssert.Contains(filter, "crop=iw:ih:0:0,scale=1000:-2:flags=lanczos");
+    }
+
+    [TestMethod]
+    public void ApplySourceFade_WhenFadeIsZero_ReturnsOriginalFilter()
+    {
+        // Arrange
+        const string baseFilter = "[0:v]split=2[bg][fg]";
+
+        // Act
+        string result = ShortsPipeline.ApplySourceFade(baseFilter, 0);
+
+        // Assert
+        Assert.AreEqual(baseFilter, result);
+    }
+
+    [TestMethod]
+    public void ApplySourceFade_WhenFadeIsPositive_RewritesSourceLabel()
+    {
+        // Act
+        string result = ShortsPipeline.ApplySourceFade("[0:v]split=2[bg][fg];[0:a]anull[a]", 1.5);
+
+        // Assert
+        StringAssert.StartsWith(result, "[0:v]format=rgba,fade=t=in:st=0:d=1.5:alpha=1[srcfade];");
+        StringAssert.Contains(result, "[srcfade]split=2[bg][fg]");
+        StringAssert.Contains(result, "[0:a]anull[a]");
+        Assert.IsFalse(result.Contains("[0:v]split", StringComparison.Ordinal));
+    }
+
+    [TestMethod]
+    public void SelectMostCommonCropSpec_PicksTheMostFrequentSpec()
+    {
+        // Arrange
+        const string output =
+            "crop=800:480:100:0\n" +
+            "crop=780:480:120:0\n" +
+            "crop=780:480:120:0\n" +
+            "crop=760:480:140:0";
+
+        // Act
+        string? spec = ShortsPipeline.SelectMostCommonCropSpec(output);
+
+        // Assert
+        Assert.AreEqual("crop=780:480:120:0", spec);
+    }
+
+    [TestMethod]
+    public void TryBuildAutoHorizontalCrop_AppliesEvenSafetyInset()
+    {
+        // Act
+        bool ok = ShortsPipeline.TryBuildAutoHorizontalCrop(800, 100, out int width, out int x);
+
+        // Assert
+        Assert.IsTrue(ok);
+        Assert.AreEqual(792, width);
+        Assert.AreEqual(104, x);
+    }
+
+    [TestMethod]
+    public void BuildManualCropFilter_UsesEdgeInsets()
+    {
+        // Act
+        string filter = ShortsPipeline.BuildManualCropFilter(120, 80, 10, 20);
+
+        // Assert
+        Assert.AreEqual("crop=iw-120-80:ih-10-20:120:10", filter);
+    }
+
+    [TestMethod]
+    public void SourceTargetWidth_SubtractsBothMargins()
+    {
+        // Act
+        int width = ShortsPipeline.SourceTargetWidth(40);
+
+        // Assert
+        Assert.AreEqual(1000, width);
+    }
 }
diff --git a/App.xaml b/App.xaml
index d853aa0..0788879 100644
--- a/App.xaml
+++ b/App.xaml
@@ -181,6 +181,12 @@
                 <Setter Property="CornerRadius" Value="10" />
             </Style>
 
+            <Style x:Key="TabButtonStyle" TargetType="Button" BasedOn="{StaticResource DefaultButtonStyle}">
+                <Setter Property="Padding" Value="16,9" />
+                <Setter Property="FontSize" Value="13" />
+                <Setter Property="CornerRadius" Value="10" />
+            </Style>
+
             <Style x:Key="PrimaryButtonStyle" TargetType="Button">
                 <Setter Property="Background" Value="{ThemeResource AccentBrush}" />
                 <Setter Property="Foreground" Value="{ThemeResource PrimaryTextBrush}" />
diff --git a/MainPage.xaml b/MainPage.xaml
index bf598f9..c980103 100644
--- a/MainPage.xaml
+++ b/MainPage.xaml
@@ -9,16 +9,24 @@
 
     <Grid x:Name="RootGrid" Padding="20" RowSpacing="16" Background="{ThemeResource PageBrush}">
         <Grid.RowDefinitions>
-            <RowDefinition Height="Auto" />
-            <RowDefinition Height="Auto" />
-            <RowDefinition Height="Auto" />
             <RowDefinition Height="*" />
             <RowDefinition Height="Auto" />
         </Grid.RowDefinitions>
 
+        <ScrollViewer Grid.Row="0"
+                      VerticalScrollBarVisibility="Auto"
+                      HorizontalScrollBarVisibility="Disabled">
+        <Grid RowSpacing="16">
+        <Grid.RowDefinitions>
+            <RowDefinition Height="Auto" />
+            <RowDefinition Height="Auto" />
+            <RowDefinition Height="Auto" />
+            <RowDefinition Height="Auto" />
+        </Grid.RowDefinitions>
+
         <StackPanel Grid.Row="0" Orientation="Horizontal" Spacing="8">
             <Button x:Name="VideoTabButton" Content="Video" Click="VideoTab_Click" Style="{StaticResource PrimaryButtonStyle}" MinWidth="120" />
-            <Button x:Name="ShortsTabButton" Content="Shorts" Click="ShortsTab_Click" MinWidth="120" />
+            <Button x:Name="ShortsTabButton" Content="Shorts" Click="ShortsTab_Click" Style="{StaticResource TabButtonStyle}" MinWidth="120" />
         </StackPanel>
 
         <Grid Grid.Row="1" ColumnSpacing="16" x:Name="VideoContentPanel">
@@ -78,103 +86,189 @@
             </Border>
         </Grid>
 
-        <Grid Grid.Row="1" RowSpacing="16" x:Name="ShortsContentPanel" Visibility="Collapsed">
-            <Grid.RowDefinitions>
-                <RowDefinition Height="Auto" />
-                <RowDefinition Height="Auto" />
-            </Grid.RowDefinitions>
+        <Border Grid.Row="1" Padding="18" Style="{StaticResource CardBorderStyle}" x:Name="ShortsContentPanel" Visibility="Collapsed">
+            <StackPanel Spacing="14">
+                <StackPanel Spacing="4">
+                    <TextBlock x:Name="ShortWizardTitleText" Text="Source clip" Style="{StaticResource SectionTitleStyle}" />
+                    <TextBlock x:Name="ShortWizardStepText" Text="Step 1 of 4" Style="{StaticResource MutedTextStyle}" />
+                    <ProgressBar x:Name="ShortWizardProgress" Minimum="0" Maximum="4" Value="1" Height="6" />
+                </StackPanel>
 
-            <Grid ColumnSpacing="16">
-                <Grid.ColumnDefinitions>
-                    <ColumnDefinition Width="*" />
-                    <ColumnDefinition Width="*" />
-                </Grid.ColumnDefinitions>
-
-                <Border Grid.Column="0" Padding="18" Style="{StaticResource CardBorderStyle}">
-                    <StackPanel Spacing="12">
-                        <TextBlock Text="Short source and clip" Style="{StaticResource SectionTitleStyle}" />
-                        <Grid ColumnSpacing="10" RowSpacing="10">
-                            <Grid.ColumnDefinitions>
-                                <ColumnDefinition Width="*" />
-                                <ColumnDefinition Width="Auto" />
-                            </Grid.ColumnDefinitions>
-                            <Grid.RowDefinitions>
-                                <RowDefinition Height="Auto" />
-                                <RowDefinition Height="Auto" />
-                            </Grid.RowDefinitions>
-                            <TextBox x:Name="ShortInputBox" Grid.Row="0" MinHeight="40" ToolTipService.ToolTip="Source video for this Short" />
-                            <Button Grid.Row="0" Grid.Column="1" Content="Browse..." Click="BrowseShortInput_Click" VerticalAlignment="Stretch" MinWidth="120" />
-                            <TextBox x:Name="ShortOutputBox" Grid.Row="1" MinHeight="40" ToolTipService.ToolTip="Output .mp4 path" />
-                            <Button Grid.Row="1" Grid.Column="1" Content="Browse..." Click="BrowseShortOutput_Click" VerticalAlignment="Stretch" MinWidth="120" />
-                        </Grid>
-                        <Grid ColumnSpacing="10">
-                            <Grid.ColumnDefinitions>
-                                <ColumnDefinition Width="*" />
-                                <ColumnDefinition Width="*" />
-                            </Grid.ColumnDefinitions>
-                            <StackPanel Grid.Column="0">
-                                <TextBlock Text="Start (HH:MM:SS)" Style="{StaticResource FieldLabelStyle}" />
-                                <TextBox x:Name="ShortStartBox" Text="00:00:00" />
-                            </StackPanel>
-                            <StackPanel Grid.Column="1">
-                                <TextBlock Text="Duration (seconds)" Style="{StaticResource FieldLabelStyle}" />
-                                <TextBox x:Name="ShortDurationBox" Text="30" />
-                            </StackPanel>
-                        </Grid>
-                        <Button x:Name="PreviewShortSourceButton" Content="Preview source" Click="PreviewShortSource_Click" HorizontalAlignment="Left" />
-                    </StackPanel>
-                </Border>
-
-                <Border Grid.Column="1" Padding="18" Style="{StaticResource CardBorderStyle}">
-                    <StackPanel Spacing="12">
-                        <TextBlock Text="Title card" Style="{StaticResource SectionTitleStyle}" />
-                        <TextBox x:Name="ShortTitleBox" Header="Title" ToolTipService.ToolTip="Production title, e.g. Ami-Back V1.04A" />
-                        <Grid ColumnSpacing="10">
-                            <Grid.ColumnDefinitions>
-                                <ColumnDefinition Width="*" />
-                                <ColumnDefinition Width="*" />
-                                <ColumnDefinition Width="*" />
-                            </Grid.ColumnDefinitions>
-                            <TextBox x:Name="ShortGroupBox" Grid.Column="0" Header="Group" />
-                            <TextBox x:Name="ShortYearBox" Grid.Column="1" Header="Year" />
-                            <TextBox x:Name="ShortTypeBox" Grid.Column="2" Header="Type" />
-                        </Grid>
-                        <TextBox x:Name="ShortHookBox" Header="Opening hook" />
-                        <TextBox x:Name="ShortWebsiteBox" Header="Closing website text" />
-                    </StackPanel>
-                </Border>
-            </Grid>
-
-            <Border Grid.Row="1" Padding="18" Style="{StaticResource CardBorderStyle}">
-                <StackPanel Spacing="12">
-                    <TextBlock Text="Style and encoding" Style="{StaticResource SectionTitleStyle}" />
+                <StackPanel x:Name="ShortStepClipPanel" Spacing="12">
+                    <TextBlock Text="Choose the Amiga clip and how much of it to use." Style="{StaticResource MutedTextStyle}" TextWrapping="WrapWholeWords" />
+                    <Grid ColumnSpacing="10" RowSpacing="10">
+                        <Grid.ColumnDefinitions>
+                            <ColumnDefinition Width="*" />
+                            <ColumnDefinition Width="Auto" />
+                        </Grid.ColumnDefinitions>
+                        <Grid.RowDefinitions>
+                            <RowDefinition Height="Auto" />
+                            <RowDefinition Height="Auto" />
+                        </Grid.RowDefinitions>
+                        <TextBox x:Name="ShortInputBox" Grid.Row="0" Header="Source video" MinHeight="40"
+                                 AutomationProperties.Name="Source video"
+                                 ToolTipService.ToolTip="Source video for this Short" />
+                        <Button Grid.Row="0" Grid.Column="1" Content="Browse..." Click="BrowseShortInput_Click"
+                                VerticalAlignment="Bottom" MinWidth="120"
+                                AutomationProperties.Name="Browse source video" />
+                        <TextBox x:Name="ShortOutputBox" Grid.Row="1" Header="Output file" MinHeight="40"
+                                 AutomationProperties.Name="Output file"
+                                 ToolTipService.ToolTip="Output .mp4 path. Leave blank to name it next to the source." />
+                        <Button Grid.Row="1" Grid.Column="1" Content="Browse..." Click="BrowseShortOutput_Click"
+                                VerticalAlignment="Bottom" MinWidth="120"
+                                AutomationProperties.Name="Browse output file" />
+                    </Grid>
                     <Grid ColumnSpacing="10">
                         <Grid.ColumnDefinitions>
                             <ColumnDefinition Width="*" />
                             <ColumnDefinition Width="*" />
                         </Grid.ColumnDefinitions>
-                        <ComboBox x:Name="ShortStyleBox" Grid.Column="0" Header="Style" SelectionChanged="ShortStyleBox_SelectionChanged" HorizontalAlignment="Stretch">
-                            <ComboBoxItem Content="Brand (title card image)" Tag="Brand" />
-                            <ComboBoxItem Content="Pixel" Tag="Pixel" />
-                            <ComboBoxItem Content="Mirror" Tag="Mirror" />
-                            <ComboBoxItem Content="Crop" Tag="Crop" />
-                            <ComboBoxItem Content="Workbench" Tag="Workbench" />
-                            <ComboBoxItem Content="Blur" Tag="Blur" />
-                            <ComboBoxItem Content="CRT" Tag="Crt" />
-                            <ComboBoxItem Content="Copper bars" Tag="Copper" />
-                            <ComboBoxItem Content="Stars" Tag="Stars" />
-                            <ComboBoxItem Content="Grid" Tag="Grid" />
-                            <ComboBoxItem Content="Tiles" Tag="Tiles" />
-                            <ComboBoxItem Content="Scanlines" Tag="Scan" />
-                            <ComboBoxItem Content="Starfield" Tag="Starfield" />
-                            <ComboBoxItem Content="Plasma" Tag="Plasma" />
-                            <ComboBoxItem Content="Rasterbars" Tag="Rasterbars" />
-                            <ComboBoxItem Content="VHS" Tag="Vhs" />
-                            <ComboBoxItem Content="Monitor" Tag="Monitor" />
-                            <ComboBoxItem Content="Split" Tag="Split" />
-                            <ComboBoxItem Content="Spectrum (needs audio)" Tag="Spectrum" />
+                        <TextBox x:Name="ShortStartBox" Grid.Column="0" Header="Start (HH:MM:SS)" Text="00:00:00"
+                                 AutomationProperties.Name="Start time" />
+                        <TextBox x:Name="ShortDurationBox" Grid.Column="1" Header="Duration (seconds)" Text="30"
+                                 AutomationProperties.Name="Duration in seconds" />
+                    </Grid>
+                    <Button x:Name="PreviewShortSourceButton" Content="Preview source" Click="PreviewShortSource_Click"
+                            HorizontalAlignment="Left" AutomationProperties.Name="Preview source" />
+                </StackPanel>
+
+                <StackPanel x:Name="ShortStepEffectPanel" Spacing="12" Visibility="Collapsed">
+                    <TextBlock Text="Pick a look. Extra settings appear on the next step only when that effect needs them."
+                               Style="{StaticResource MutedTextStyle}" TextWrapping="WrapWholeWords" />
+                    <ComboBox x:Name="ShortStyleBox" Header="Effect" SelectionChanged="ShortStyleBox_SelectionChanged"
+                              HorizontalAlignment="Stretch" AutomationProperties.Name="Visual effect">
+                        <ComboBoxItem Content="Brand (title card image)" Tag="Brand" />
+                        <ComboBoxItem Content="Pixel" Tag="Pixel" />
+                        <ComboBoxItem Content="Mirror" Tag="Mirror" />
+                        <ComboBoxItem Content="Crop" Tag="Crop" />
+                        <ComboBoxItem Content="Workbench" Tag="Workbench" />
+                        <ComboBoxItem Content="Blur" Tag="Blur" />
+                        <ComboBoxItem Content="CRT" Tag="Crt" />
+                        <ComboBoxItem Content="Copper bars" Tag="Copper" />
+                        <ComboBoxItem Content="Stars" Tag="Stars" />
+                        <ComboBoxItem Content="Grid" Tag="Grid" />
+                        <ComboBoxItem Content="Tiles" Tag="Tiles" />
+                        <ComboBoxItem Content="Scanlines" Tag="Scan" />
+                        <ComboBoxItem Content="Starfield" Tag="Starfield" />
+                        <ComboBoxItem Content="Plasma" Tag="Plasma" />
+                        <ComboBoxItem Content="Rasterbars" Tag="Rasterbars" />
+                        <ComboBoxItem Content="VHS" Tag="Vhs" />
+                        <ComboBoxItem Content="Monitor" Tag="Monitor" />
+                        <ComboBoxItem Content="Split" Tag="Split" />
+                        <ComboBoxItem Content="Spectrum (needs audio)" Tag="Spectrum" />
+                        <ComboBoxItem Content="Video (background clip)" Tag="Video" />
+                    </ComboBox>
+                    <TextBlock x:Name="ShortStyleDescriptionText" Text="" Style="{StaticResource MutedTextStyle}" TextWrapping="WrapWholeWords" />
+                    <TextBox x:Name="ShortFadeInBox" Header="Source fade-in (seconds)" Text="1.5"
+                             AutomationProperties.Name="Source fade-in seconds"
+                             ToolTipService.ToolTip="Fade only the Amiga clip in. The background stays visible from the first frame. Use 0 to disable." />
+                </StackPanel>
+
+                <StackPanel x:Name="ShortStepStyleOptionsPanel" Spacing="12" Visibility="Collapsed">
+                    <Grid x:Name="ShortBackgroundRow" ColumnSpacing="10">
+                        <Grid.ColumnDefinitions>
+                            <ColumnDefinition Width="*" />
+                            <ColumnDefinition Width="Auto" />
+                        </Grid.ColumnDefinitions>
+                        <TextBox x:Name="ShortBackgroundBox" Grid.Column="0" Header="Background image"
+                                 AutomationProperties.Name="Background image" />
+                        <Button Grid.Column="1" Content="Browse..." Click="BrowseShortBackground_Click"
+                                VerticalAlignment="Bottom" MinWidth="120"
+                                AutomationProperties.Name="Browse background image" />
+                    </Grid>
+
+                    <StackPanel x:Name="ShortVideoOptionsPanel" Spacing="12">
+                        <Grid ColumnSpacing="10">
+                            <Grid.ColumnDefinitions>
+                                <ColumnDefinition Width="*" />
+                                <ColumnDefinition Width="Auto" />
+                            </Grid.ColumnDefinitions>
+                            <TextBox x:Name="ShortBackgroundVideoBox" Grid.Column="0" Header="Background video"
+                                     AutomationProperties.Name="Background video" />
+                            <Button Grid.Column="1" Content="Browse..." Click="BrowseShortBackgroundVideo_Click"
+                                    VerticalAlignment="Bottom" MinWidth="120"
+                                    AutomationProperties.Name="Browse background video" />
+                        </Grid>
+                        <Grid ColumnSpacing="10">
+                            <Grid.ColumnDefinitions>
+                                <ColumnDefinition Width="*" />
+                                <ColumnDefinition Width="*" />
+                                <ColumnDefinition Width="*" />
+                            </Grid.ColumnDefinitions>
+                            <TextBox x:Name="ShortVideoBlurBox" Grid.Column="0" Header="Background blur" Text="0"
+                                     AutomationProperties.Name="Background video blur" />
+                            <TextBox x:Name="ShortVideoOpacityBox" Grid.Column="1" Header="Background opacity (0-1)" Text="1.0"
+                                     AutomationProperties.Name="Background video opacity" />
+                            <TextBox x:Name="ShortSourceMarginBox" Grid.Column="2" Header="Side margin (px)" Text="40"
+                                     AutomationProperties.Name="Source side margin" />
+                        </Grid>
+                        <ComboBox x:Name="ShortCropModeBox" Header="Source crop" HorizontalAlignment="Stretch"
+                                  AutomationProperties.Name="Source crop mode">
+                            <ComboBoxItem Content="Auto (remove left/right black borders)" Tag="Auto" />
+                            <ComboBoxItem Content="Center 4:3" Tag="Center" />
                         </ComboBox>
-                        <ComboBox x:Name="ShortPresetBox" Grid.Column="1" Header="x264 preset" HorizontalAlignment="Stretch">
+                        <TextBlock Text="Manual crop overrides auto/center. Leave at 0 to use the mode above."
+                                   Style="{StaticResource MutedTextStyle}" TextWrapping="WrapWholeWords" />
+                        <Grid ColumnSpacing="10">
+                            <Grid.ColumnDefinitions>
+                                <ColumnDefinition Width="*" />
+                                <ColumnDefinition Width="*" />
+                                <ColumnDefinition Width="*" />
+                                <ColumnDefinition Width="*" />
+                            </Grid.ColumnDefinitions>
+                            <TextBox x:Name="ShortCropLeftBox" Grid.Column="0" Header="Crop left" Text="0"
+                                     AutomationProperties.Name="Crop left pixels" />
+                            <TextBox x:Name="ShortCropRightBox" Grid.Column="1" Header="Crop right" Text="0"
+                                     AutomationProperties.Name="Crop right pixels" />
+                            <TextBox x:Name="ShortCropTopBox" Grid.Column="2" Header="Crop top" Text="0"
+                                     AutomationProperties.Name="Crop top pixels" />
+                            <TextBox x:Name="ShortCropBottomBox" Grid.Column="3" Header="Crop bottom" Text="0"
+                                     AutomationProperties.Name="Crop bottom pixels" />
+                        </Grid>
+                    </StackPanel>
+                </StackPanel>
+
+                <StackPanel x:Name="ShortStepTitlesPanel" Spacing="12" Visibility="Collapsed">
+                    <TextBlock Text="These lines appear as the opening hook and the closing title card."
+                               Style="{StaticResource MutedTextStyle}" TextWrapping="WrapWholeWords" />
+                    <TextBox x:Name="ShortTitleBox" Header="Title"
+                             AutomationProperties.Name="Title"
+                             ToolTipService.ToolTip="Production title, e.g. Ami-Back V1.04A" />
+                    <Grid ColumnSpacing="10">
+                        <Grid.ColumnDefinitions>
+                            <ColumnDefinition Width="*" />
+                            <ColumnDefinition Width="*" />
+                            <ColumnDefinition Width="*" />
+                        </Grid.ColumnDefinitions>
+                        <TextBox x:Name="ShortGroupBox" Grid.Column="0" Header="Group" AutomationProperties.Name="Group" />
+                        <TextBox x:Name="ShortYearBox" Grid.Column="1" Header="Year" AutomationProperties.Name="Year" />
+                        <TextBox x:Name="ShortTypeBox" Grid.Column="2" Header="Type" AutomationProperties.Name="Type" />
+                    </Grid>
+                    <TextBox x:Name="ShortHookBox" Header="Opening hook" AutomationProperties.Name="Opening hook" />
+                    <TextBox x:Name="ShortWebsiteBox" Header="Closing website text" AutomationProperties.Name="Closing website text" />
+                </StackPanel>
+
+                <StackPanel x:Name="ShortStepEncodePanel" Spacing="12" Visibility="Collapsed">
+                    <TextBlock Text="Encoding quality and the font used for the title card."
+                               Style="{StaticResource MutedTextStyle}" TextWrapping="WrapWholeWords" />
+                    <Grid ColumnSpacing="10">
+                        <Grid.ColumnDefinitions>
+                            <ColumnDefinition Width="*" />
+                            <ColumnDefinition Width="Auto" />
+                        </Grid.ColumnDefinitions>
+                        <TextBox x:Name="ShortFontBox" Grid.Column="0" Header="Bold font file (.ttf/.otf)"
+                                 AutomationProperties.Name="Bold font file" />
+                        <Button Grid.Column="1" Content="Browse..." Click="BrowseShortFont_Click"
+                                VerticalAlignment="Bottom" MinWidth="120"
+                                AutomationProperties.Name="Browse font file" />
+                    </Grid>
+                    <Grid ColumnSpacing="10">
+                        <Grid.ColumnDefinitions>
+                            <ColumnDefinition Width="*" />
+                            <ColumnDefinition Width="120" />
+                        </Grid.ColumnDefinitions>
+                        <ComboBox x:Name="ShortPresetBox" Grid.Column="0" Header="x264 preset"
+                                  HorizontalAlignment="Stretch" AutomationProperties.Name="x264 preset">
                             <ComboBoxItem Content="ultrafast" Tag="ultrafast" />
                             <ComboBoxItem Content="superfast" Tag="superfast" />
                             <ComboBoxItem Content="veryfast" Tag="veryfast" />
@@ -185,30 +279,19 @@
                             <ComboBoxItem Content="slower" Tag="slower" />
                             <ComboBoxItem Content="veryslow" Tag="veryslow" />
                         </ComboBox>
+                        <TextBox x:Name="ShortCrfBox" Grid.Column="1" Header="CRF" AutomationProperties.Name="CRF" />
                     </Grid>
-                    <Grid x:Name="ShortBackgroundRow" ColumnSpacing="10">
-                        <Grid.ColumnDefinitions>
-                            <ColumnDefinition Width="*" />
-                            <ColumnDefinition Width="Auto" />
-                        </Grid.ColumnDefinitions>
-                        <TextBox x:Name="ShortBackgroundBox" Grid.Column="0" Header="Background image (brand style)" />
-                        <Button Grid.Column="1" Content="Browse..." Click="BrowseShortBackground_Click" VerticalAlignment="Bottom" MinWidth="120" />
-                    </Grid>
-                    <Grid ColumnSpacing="10">
-                        <Grid.ColumnDefinitions>
-                            <ColumnDefinition Width="*" />
-                            <ColumnDefinition Width="Auto" />
-                            <ColumnDefinition Width="120" />
-                        </Grid.ColumnDefinitions>
-                        <TextBox x:Name="ShortFontBox" Grid.Column="0" Header="Bold font file (.ttf/.otf)" />
-                        <Button Grid.Column="1" Content="Browse..." Click="BrowseShortFont_Click" VerticalAlignment="Bottom" MinWidth="120" />
-                        <TextBox x:Name="ShortCrfBox" Grid.Column="2" Header="CRF" />
-                    </Grid>
+                    <TextBlock x:Name="ShortSummaryText" Text="" Style="{StaticResource MutedTextStyle}" TextWrapping="WrapWholeWords" />
                 </StackPanel>
-            </Border>
-        </Grid>
+            </StackPanel>
+        </Border>
 
-        <Border Grid.Row="2" Padding="18" Style="{StaticResource CardBorderStyle}">
+        <Border x:Name="RenderProgressPanel"
+                Grid.Row="2"
+                Padding="18"
+                Style="{StaticResource CardBorderStyle}"
+                Visibility="Collapsed"
+                AutomationProperties.Name="Render progress">
             <StackPanel Spacing="12">
                 <TextBlock Text="Render progress" Style="{StaticResource SectionTitleStyle}" />
                 <StackPanel Orientation="Horizontal" Spacing="6">
@@ -220,7 +303,12 @@
             </StackPanel>
         </Border>
 
-        <Border Grid.Row="3" Padding="18" Style="{StaticResource CardBorderStyle}">
+        <Border x:Name="FfmpegLogPanel"
+                Grid.Row="3"
+                Padding="18"
+                Style="{StaticResource CardBorderStyle}"
+                Visibility="Collapsed"
+                AutomationProperties.Name="FFmpeg log">
             <StackPanel Spacing="12">
                 <TextBlock Text="FFmpeg log" Style="{StaticResource SectionTitleStyle}" />
                 <TextBox x:Name="LogBox"
@@ -232,11 +320,14 @@
                          FontFamily="Consolas"
                          FontSize="12"
                          VerticalAlignment="Stretch"
-                         Height="260" />
+                         MinHeight="320" />
             </StackPanel>
         </Border>
 
-        <Grid Grid.Row="4">
+        </Grid>
+        </ScrollViewer>
+
+        <Grid Grid.Row="1">
             <Grid.ColumnDefinitions>
                 <ColumnDefinition Width="*" />
                 <ColumnDefinition Width="Auto" />
@@ -248,6 +339,11 @@
             </StackPanel>
 
             <StackPanel Grid.Column="1" Orientation="Horizontal" Spacing="10">
+                <Button x:Name="ShortBackButton" Content="Previous" Click="ShortBack_Click" Visibility="Collapsed"
+                        MinWidth="120" AutomationProperties.Name="Previous short step" />
+                <Button x:Name="ShortNextButton" Content="Next" Click="ShortNext_Click" Visibility="Collapsed"
+                        MinWidth="120" Style="{StaticResource PrimaryButtonStyle}"
+                        AutomationProperties.Name="Next short step" />
                 <Button x:Name="OpenSettingsButton" Content="&#xE713;" FontFamily="Segoe Fluent Icons, Segoe MDL2 Assets"
                         Click="OpenSettings_Click" Style="{StaticResource IconButtonStyle}"
                         ToolTipService.ToolTip="Settings" AutomationProperties.Name="Settings" />
diff --git a/MainPage.xaml.cs b/MainPage.xaml.cs
index b530a5f..2bc84a8 100644
--- a/MainPage.xaml.cs
+++ b/MainPage.xaml.cs
@@ -23,6 +23,10 @@ public sealed partial class MainPage : Page
     private string? _lastRenderedFile;
     private bool _logFlushScheduled;
     private bool _isShortsTab;
+    private bool _isRendering;
+    private bool _keepRenderOutput;
+    private List<ShortWizardStep> _wizardSteps = [.. ShortWizard.StepsFor(ShortStyle.Brand)];
+    private int _wizardIndex;
 
     public MainPage()
     {
@@ -48,12 +52,23 @@ public sealed partial class MainPage : Page
         ShortWebsiteBox.Text = _loadedSettings.ShortsWebsite;
         ShortCrfBox.Text = _loadedSettings.ShortsCrf;
         ShortBackgroundBox.Text = _loadedSettings.ShortsBackgroundImage;
+        ShortBackgroundVideoBox.Text = _loadedSettings.ShortsBackgroundVideo;
+        ShortVideoBlurBox.Text = _loadedSettings.ShortsVideoBlur;
+        ShortVideoOpacityBox.Text = _loadedSettings.ShortsVideoOpacity;
+        ShortSourceMarginBox.Text = _loadedSettings.ShortsSourceMarginX;
+        ShortFadeInBox.Text = _loadedSettings.ShortsSourceFadeIn;
+        ShortCropLeftBox.Text = _loadedSettings.ShortsCropLeft;
+        ShortCropRightBox.Text = _loadedSettings.ShortsCropRight;
+        ShortCropTopBox.Text = _loadedSettings.ShortsCropTop;
+        ShortCropBottomBox.Text = _loadedSettings.ShortsCropBottom;
         ShortFontBox.Text = string.IsNullOrWhiteSpace(_loadedSettings.ShortsFontFile)
             ? ShortsPipeline.FindDefaultFont() ?? ""
             : _loadedSettings.ShortsFontFile;
         SelectComboTag(ShortStyleBox, _loadedSettings.ShortsStyle);
         SelectComboTag(ShortPresetBox, _loadedSettings.ShortsPreset);
-        UpdateShortBackgroundVisibility();
+        SelectComboTag(ShortCropModeBox, _loadedSettings.ShortsSourceCropMode);
+        RefreshWizardSteps();
+        ShowWizardStep();
     }
 
     private void VideoTab_Click(object sender, RoutedEventArgs e) => SetActiveTab(shorts: false);
@@ -62,23 +77,135 @@ public sealed partial class MainPage : Page
 
     private void SetActiveTab(bool shorts)
     {
+        if (!_isRendering)
+            _keepRenderOutput = false;
         _isShortsTab = shorts;
-        VideoContentPanel.Visibility = shorts ? Visibility.Collapsed : Visibility.Visible;
-        ShortsContentPanel.Visibility = shorts ? Visibility.Visible : Visibility.Collapsed;
         Style primaryButtonStyle = (Style)Application.Current.Resources["PrimaryButtonStyle"];
-        VideoTabButton.Style = shorts ? null : primaryButtonStyle;
-        ShortsTabButton.Style = shorts ? primaryButtonStyle : null;
+        Style tabButtonStyle = (Style)Application.Current.Resources["TabButtonStyle"];
+        VideoTabButton.Style = shorts ? tabButtonStyle : primaryButtonStyle;
+        ShortsTabButton.Style = shorts ? primaryButtonStyle : tabButtonStyle;
         RenderButton.Content = shorts ? "Render short" : "Start render";
+        UpdateWorkspaceVisibility();
     }
 
-    private void ShortStyleBox_SelectionChanged(object sender, SelectionChangedEventArgs e) => UpdateShortBackgroundVisibility();
-
-    private void UpdateShortBackgroundVisibility()
+    private void ShortStyleBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
     {
-        bool isBrand = string.Equals(SelectedShortStyle(), nameof(ShortStyle.Brand), StringComparison.OrdinalIgnoreCase);
-        ShortBackgroundRow.Visibility = isBrand ? Visibility.Visible : Visibility.Collapsed;
+        if (!IsLoaded) return;
+        RefreshWizardSteps();
+        ShowWizardStep();
     }
 
+    private void ShortBack_Click(object sender, RoutedEventArgs e)
+    {
+        if (_wizardIndex <= 0) return;
+        _keepRenderOutput = false;
+        _wizardIndex--;
+        ShowWizardStep();
+    }
+
+    private async void ShortNext_Click(object sender, RoutedEventArgs e)
+    {
+        try
+        {
+            ValidateCurrentWizardStep();
+            if (_wizardIndex >= _wizardSteps.Count - 1) return;
+            _keepRenderOutput = false;
+            _wizardIndex++;
+            ShowWizardStep();
+        }
+        catch (Exception exception)
+        {
+            await ShowMessageAsync("Check this step", exception.Message);
+        }
+    }
+
+    private void RefreshWizardSteps()
+    {
+        ShortWizardStep current = _wizardSteps[Math.Clamp(_wizardIndex, 0, _wizardSteps.Count - 1)];
+        _wizardSteps = [.. ShortWizard.StepsFor(SelectedShortStyleEnum())];
+        int index = _wizardSteps.IndexOf(current);
+        _wizardIndex = index >= 0 ? index : Math.Min(_wizardIndex, _wizardSteps.Count - 1);
+    }
+
+    private void ShowWizardStep()
+    {
+        ShortWizardStep step = _wizardSteps[Math.Clamp(_wizardIndex, 0, _wizardSteps.Count - 1)];
+        ShortWizardTitleText.Text = ShortWizard.Title(step);
+        ShortWizardStepText.Text = $"Step {_wizardIndex + 1} of {_wizardSteps.Count}";
+        ShortWizardProgress.Maximum = _wizardSteps.Count;
+        ShortWizardProgress.Value = _wizardIndex + 1;
+
+        ShortStepClipPanel.Visibility = VisibleIf(step == ShortWizardStep.Clip);
+        ShortStepEffectPanel.Visibility = VisibleIf(step == ShortWizardStep.Effect);
+        ShortStepStyleOptionsPanel.Visibility = VisibleIf(step == ShortWizardStep.StyleOptions);
+        ShortStepTitlesPanel.Visibility = VisibleIf(step == ShortWizardStep.Titles);
+        ShortStepEncodePanel.Visibility = VisibleIf(step == ShortWizardStep.Encode);
+
+        ShortStyle style = SelectedShortStyleEnum();
+        ShortStyleDescriptionText.Text = ShortWizard.Description(style);
+        ShortBackgroundRow.Visibility = VisibleIf(style == ShortStyle.Brand);
+        ShortVideoOptionsPanel.Visibility = VisibleIf(style == ShortStyle.Video);
+
+        if (step == ShortWizardStep.Encode)
+            ShortSummaryText.Text = BuildShortSummary();
+
+        UpdateWizardNavigation();
+    }
+
+    private void UpdateWizardNavigation()
+    {
+        bool shorts = _isShortsTab && !_isRendering;
+        bool lastStep = _wizardIndex >= _wizardSteps.Count - 1;
+        ShortBackButton.Visibility = VisibleIf(shorts);
+        ShortNextButton.Visibility = VisibleIf(shorts && !lastStep);
+        ShortBackButton.IsEnabled = shorts && _wizardIndex > 0;
+        ShortNextButton.IsEnabled = shorts;
+        RenderButton.Visibility = VisibleIf(!_isRendering && (!shorts || lastStep));
+    }
+
+    private void ValidateCurrentWizardStep()
+    {
+        ShortWizardStep step = _wizardSteps[_wizardIndex];
+        switch (step)
+        {
+            case ShortWizardStep.Clip:
+                if (string.IsNullOrWhiteSpace(ShortInputBox.Text) || !File.Exists(ShortInputBox.Text.Trim()))
+                    throw new FileNotFoundException("Select a valid source video for the Short.");
+                ParsePositiveDuration();
+                break;
+            case ShortWizardStep.Effect:
+                ParseNonNegativeNumber(ShortFadeInBox.Text, "source fade-in");
+                break;
+            case ShortWizardStep.StyleOptions:
+                if (SelectedShortStyleEnum() == ShortStyle.Brand
+                    && (string.IsNullOrWhiteSpace(ShortBackgroundBox.Text) || !File.Exists(ShortBackgroundBox.Text.Trim())))
+                    throw new FileNotFoundException("The brand style requires a background image.");
+                if (SelectedShortStyleEnum() == ShortStyle.Video)
+                    ReadVideoStyleOptions();
+                break;
+            case ShortWizardStep.Titles:
+                if (string.IsNullOrWhiteSpace(ShortTitleBox.Text))
+                    throw new ArgumentException("Enter a title.");
+                break;
+            case ShortWizardStep.Encode:
+                if (string.IsNullOrWhiteSpace(ShortFontBox.Text) || !File.Exists(ShortFontBox.Text.Trim()))
+                    throw new FileNotFoundException("Select a bold TrueType/OpenType font file.");
+                ParseCrf();
+                break;
+        }
+    }
+
+    private string BuildShortSummary()
+    {
+        string input = string.IsNullOrWhiteSpace(ShortInputBox.Text)
+            ? "(no source yet)"
+            : Path.GetFileName(ShortInputBox.Text.Trim());
+        string title = string.IsNullOrWhiteSpace(ShortTitleBox.Text) ? "(no title yet)" : ShortTitleBox.Text.Trim();
+        return $"{SelectedShortStyleEnum()} · {input} · {ShortStartBox.Text.Trim()} + {ShortDurationBox.Text.Trim()}s · {title}";
+    }
+
+    private static Visibility VisibleIf(bool visible) => visible ? Visibility.Visible : Visibility.Collapsed;
+
     private async void AddInputs_Click(object sender, RoutedEventArgs e)
     {
         FileOpenPicker picker = CreateFileOpenPicker();
@@ -180,6 +307,7 @@ public sealed partial class MainPage : Page
     {
         try
         {
+            _keepRenderOutput = false;
             SetRendering(true);
             LogBox.Text = string.Empty;
             _renderCancellation = new CancellationTokenSource();
@@ -191,10 +319,12 @@ public sealed partial class MainPage : Page
         }
         catch (OperationCanceledException)
         {
+            _keepRenderOutput = true;
             UpdateProgress(new(RenderProgressBar.Value, "Cancelled", "The render was cancelled."));
         }
         catch (Exception exception)
         {
+            _keepRenderOutput = true;
             AppendLog("ERROR: " + exception);
             StageText.Text = "Failed";
             await ShowMessageAsync("Render failed", UserFacingErrors.Summarize(exception));
@@ -308,14 +438,15 @@ public sealed partial class MainPage : Page
 
     private ShortSettings ReadShortSettings()
     {
-        if (!double.TryParse(ShortDurationBox.Text.Replace(',', '.'), NumberStyles.Float, CultureInfo.InvariantCulture, out double duration) || duration <= 0)
-            throw new ArgumentException("Enter a valid duration in seconds.");
-        if (!int.TryParse(ShortCrfBox.Text, out int crf))
-            throw new ArgumentException("CRF must be an integer.");
+        double duration = ParsePositiveDuration();
+        int crf = ParseCrf();
+        (double blur, double opacity, int marginX, ShortSourceCropMode cropMode, int left, int right, int top, int bottom)
+            = ReadVideoStyleOptions();
+        double fadeIn = ParseNonNegativeNumber(ShortFadeInBox.Text, "source fade-in");
 
         string input = ShortInputBox.Text.Trim();
         string output = ShortOutputBox.Text.Trim();
-        ShortStyle style = Enum.Parse<ShortStyle>(SelectedShortStyle());
+        ShortStyle style = SelectedShortStyleEnum();
         if (string.IsNullOrWhiteSpace(output) && !string.IsNullOrWhiteSpace(input))
         {
             string baseName = Path.GetFileNameWithoutExtension(input);
@@ -337,6 +468,16 @@ public sealed partial class MainPage : Page
             DurationSeconds = duration,
             Style = style,
             BackgroundImage = ShortBackgroundBox.Text.Trim(),
+            BackgroundVideo = ShortBackgroundVideoBox.Text.Trim(),
+            VideoBlur = blur,
+            VideoOpacity = opacity,
+            SourceCropMode = cropMode,
+            CropLeft = left,
+            CropRight = right,
+            CropTop = top,
+            CropBottom = bottom,
+            SourceMarginX = marginX,
+            SourceFadeInSeconds = fadeIn,
             FontFile = ShortFontBox.Text.Trim(),
             FfmpegPath = FfmpegPathBox.Text.Trim(),
             FfprobePath = FfprobePathBox.Text.Trim(),
@@ -345,6 +486,59 @@ public sealed partial class MainPage : Page
         };
     }
 
+    private double ParsePositiveDuration()
+    {
+        if (!double.TryParse(ShortDurationBox.Text.Replace(',', '.'), NumberStyles.Float, CultureInfo.InvariantCulture, out double duration) || duration <= 0)
+            throw new ArgumentException("Enter a valid duration in seconds.");
+        return duration;
+    }
+
+    private int ParseCrf()
+    {
+        if (!int.TryParse(ShortCrfBox.Text, NumberStyles.Integer, CultureInfo.InvariantCulture, out int crf))
+            throw new ArgumentException("CRF must be an integer.");
+        return crf;
+    }
+
+    private static double ParseNonNegativeNumber(string text, string name)
+    {
+        if (!double.TryParse(text.Replace(',', '.'), NumberStyles.Float, CultureInfo.InvariantCulture, out double value) || value < 0)
+            throw new ArgumentException($"Enter a valid non-negative value for {name}.");
+        return value;
+    }
+
+    private static int ParseNonNegativeInt(string text, string name)
+    {
+        if (!int.TryParse(text, NumberStyles.Integer, CultureInfo.InvariantCulture, out int value) || value < 0)
+            throw new ArgumentException($"{name} must be a non-negative integer.");
+        return value;
+    }
+
+    private (double Blur, double Opacity, int MarginX, ShortSourceCropMode CropMode, int Left, int Right, int Top, int Bottom)
+        ReadVideoStyleOptions()
+    {
+        double blur = ParseNonNegativeNumber(ShortVideoBlurBox.Text, "background blur");
+        double opacity = ParseNonNegativeNumber(ShortVideoOpacityBox.Text, "background opacity");
+        if (opacity > 1)
+            throw new ArgumentException("Background opacity must be between 0.0 and 1.0.");
+        int marginX = ParseNonNegativeInt(ShortSourceMarginBox.Text, "Side margin");
+        if (marginX >= 540)
+            throw new ArgumentException("Source side margin must be less than 540 pixels.");
+        if (SelectedShortStyleEnum() == ShortStyle.Video
+            && (string.IsNullOrWhiteSpace(ShortBackgroundVideoBox.Text) || !File.Exists(ShortBackgroundVideoBox.Text.Trim())))
+            throw new FileNotFoundException("The video style requires a background video.");
+
+        return (
+            blur,
+            opacity,
+            marginX,
+            SelectedShortCropMode(),
+            ParseNonNegativeInt(ShortCropLeftBox.Text, "Crop left"),
+            ParseNonNegativeInt(ShortCropRightBox.Text, "Crop right"),
+            ParseNonNegativeInt(ShortCropTopBox.Text, "Crop top"),
+            ParseNonNegativeInt(ShortCropBottomBox.Text, "Crop bottom"));
+    }
+
     private async void BrowseShortInput_Click(object sender, RoutedEventArgs e)
     {
         FileOpenPicker picker = CreateFileOpenPicker();
@@ -378,6 +572,17 @@ public sealed partial class MainPage : Page
             ShortBackgroundBox.Text = file.Path;
     }
 
+    private async void BrowseShortBackgroundVideo_Click(object sender, RoutedEventArgs e)
+    {
+        FileOpenPicker picker = CreateFileOpenPicker();
+        foreach (string extension in SupportedVideoFormats.Extensions)
+            picker.FileTypeFilter.Add(extension);
+        picker.SuggestedStartLocation = PickerLocationId.VideosLibrary;
+        var file = await picker.PickSingleFileAsync();
+        if (file is not null)
+            ShortBackgroundVideoBox.Text = file.Path;
+    }
+
     private async void BrowseShortFont_Click(object sender, RoutedEventArgs e)
     {
         FileOpenPicker picker = CreateFileOpenPicker();
@@ -396,11 +601,25 @@ public sealed partial class MainPage : Page
 
     private void SetRendering(bool rendering)
     {
+        _isRendering = rendering;
         RenderButton.IsEnabled = !rendering;
         CancelButton.IsEnabled = rendering;
         OpenSettingsButton.IsEnabled = !rendering;
         VideoTabButton.IsEnabled = !rendering;
         ShortsTabButton.IsEnabled = !rendering;
+        UpdateWorkspaceVisibility();
+    }
+
+    private void UpdateWorkspaceVisibility()
+    {
+        bool showSetup = !_isRendering;
+        bool showOutput = _isRendering || _keepRenderOutput;
+
+        VideoContentPanel.Visibility = VisibleIf(showSetup && !_isShortsTab);
+        ShortsContentPanel.Visibility = VisibleIf(showSetup && _isShortsTab);
+        RenderProgressPanel.Visibility = VisibleIf(showOutput);
+        FfmpegLogPanel.Visibility = VisibleIf(showOutput);
+        UpdateWizardNavigation();
     }
 
     private void UpdateProgress(RenderProgress value)
@@ -496,6 +715,16 @@ public sealed partial class MainPage : Page
             ShortsWebsite = ShortWebsiteBox.Text.Trim(),
             ShortsFontFile = ShortFontBox.Text.Trim(),
             ShortsBackgroundImage = ShortBackgroundBox.Text.Trim(),
+            ShortsBackgroundVideo = ShortBackgroundVideoBox.Text.Trim(),
+            ShortsVideoBlur = ShortVideoBlurBox.Text.Trim(),
+            ShortsVideoOpacity = ShortVideoOpacityBox.Text.Trim(),
+            ShortsSourceCropMode = SelectedShortCropMode().ToString(),
+            ShortsCropLeft = ShortCropLeftBox.Text.Trim(),
+            ShortsCropRight = ShortCropRightBox.Text.Trim(),
+            ShortsCropTop = ShortCropTopBox.Text.Trim(),
+            ShortsCropBottom = ShortCropBottomBox.Text.Trim(),
+            ShortsSourceMarginX = ShortSourceMarginBox.Text.Trim(),
+            ShortsSourceFadeIn = ShortFadeInBox.Text.Trim(),
             ShortsCrf = ShortCrfBox.Text.Trim(),
             ShortsPreset = SelectedShortPreset(),
         });
@@ -507,6 +736,15 @@ public sealed partial class MainPage : Page
 
     private string SelectedShortStyle() => (ShortStyleBox.SelectedItem as ComboBoxItem)?.Tag?.ToString() ?? "Brand";
 
+    private ShortStyle SelectedShortStyleEnum() =>
+        Enum.TryParse(SelectedShortStyle(), ignoreCase: true, out ShortStyle style) ? style : ShortStyle.Brand;
+
+    private ShortSourceCropMode SelectedShortCropMode()
+    {
+        string tag = (ShortCropModeBox.SelectedItem as ComboBoxItem)?.Tag?.ToString() ?? "Auto";
+        return Enum.TryParse(tag, ignoreCase: true, out ShortSourceCropMode mode) ? mode : ShortSourceCropMode.Auto;
+    }
+
     private string SelectedShortPreset() => (ShortPresetBox.SelectedItem as ComboBoxItem)?.Tag?.ToString() ?? "slow";
 
     private void SelectTheme(string theme) => SelectComboTag(ThemeBox, theme);
diff --git a/Models/AppSettings.cs b/Models/AppSettings.cs
index 3aebeb4..fe4bf81 100644
--- a/Models/AppSettings.cs
+++ b/Models/AppSettings.cs
@@ -28,6 +28,16 @@ public sealed record AppSettings
     public string ShortsWebsite { get; init; } = "AMIGADB.NET";
     public string ShortsFontFile { get; init; } = "";
     public string ShortsBackgroundImage { get; init; } = "";
+    public string ShortsBackgroundVideo { get; init; } = "";
+    public string ShortsVideoBlur { get; init; } = "0";
+    public string ShortsVideoOpacity { get; init; } = "1.0";
+    public string ShortsSourceCropMode { get; init; } = "Auto";
+    public string ShortsCropLeft { get; init; } = "0";
+    public string ShortsCropRight { get; init; } = "0";
+    public string ShortsCropTop { get; init; } = "0";
+    public string ShortsCropBottom { get; init; } = "0";
+    public string ShortsSourceMarginX { get; init; } = "40";
+    public string ShortsSourceFadeIn { get; init; } = "1.5";
     public string ShortsCrf { get; init; } = "16";
     public string ShortsPreset { get; init; } = "slow";
 
@@ -68,6 +78,16 @@ public sealed record AppSettings
         ShortsWebsite = ShortsWebsite ?? "AMIGADB.NET",
         ShortsFontFile = ShortsFontFile ?? "",
         ShortsBackgroundImage = ShortsBackgroundImage ?? "",
+        ShortsBackgroundVideo = ShortsBackgroundVideo ?? "",
+        ShortsVideoBlur = string.IsNullOrWhiteSpace(ShortsVideoBlur) ? "0" : ShortsVideoBlur,
+        ShortsVideoOpacity = string.IsNullOrWhiteSpace(ShortsVideoOpacity) ? "1.0" : ShortsVideoOpacity,
+        ShortsSourceCropMode = string.IsNullOrWhiteSpace(ShortsSourceCropMode) ? "Auto" : ShortsSourceCropMode,
+        ShortsCropLeft = string.IsNullOrWhiteSpace(ShortsCropLeft) ? "0" : ShortsCropLeft,
+        ShortsCropRight = string.IsNullOrWhiteSpace(ShortsCropRight) ? "0" : ShortsCropRight,
+        ShortsCropTop = string.IsNullOrWhiteSpace(ShortsCropTop) ? "0" : ShortsCropTop,
+        ShortsCropBottom = string.IsNullOrWhiteSpace(ShortsCropBottom) ? "0" : ShortsCropBottom,
+        ShortsSourceMarginX = string.IsNullOrWhiteSpace(ShortsSourceMarginX) ? "40" : ShortsSourceMarginX,
+        ShortsSourceFadeIn = string.IsNullOrWhiteSpace(ShortsSourceFadeIn) ? "1.5" : ShortsSourceFadeIn,
         ShortsCrf = string.IsNullOrWhiteSpace(ShortsCrf) ? "16" : ShortsCrf,
         ShortsPreset = string.IsNullOrWhiteSpace(ShortsPreset) ? "slow" : ShortsPreset,
     };
diff --git a/Models/ShortSettings.cs b/Models/ShortSettings.cs
index 2ba2c4a..b400687 100644
--- a/Models/ShortSettings.cs
+++ b/Models/ShortSettings.cs
@@ -1,6 +1,6 @@
 namespace AmiReel.Models;
 
-/// <summary>Visual style applied to a YouTube Short. Mirrors the --style values of amigadb-short.sh.</summary>
+/// <summary>Visual style applied to a YouTube Short. Mirrors the --style values of amigadb-short-fx-v4.sh.</summary>
 public enum ShortStyle
 {
     Brand,
@@ -22,9 +22,17 @@ public enum ShortStyle
     Monitor,
     Split,
     Spectrum,
+    Video,
 }
 
-/// <summary>One YouTube Shorts render job's parameters (port of amigadb-short.sh's arguments).</summary>
+/// <summary>How the video style crops the Amiga source before overlaying it.</summary>
+public enum ShortSourceCropMode
+{
+    Auto,
+    Center,
+}
+
+/// <summary>One YouTube Shorts render job's parameters (port of amigadb-short-fx-v4.sh).</summary>
 public sealed record ShortSettings
 {
     public required string InputFile { get; init; }
@@ -39,6 +47,16 @@ public sealed record ShortSettings
     public required double DurationSeconds { get; init; }
     public required ShortStyle Style { get; init; }
     public string BackgroundImage { get; init; } = "";
+    public string BackgroundVideo { get; init; } = "";
+    public double VideoBlur { get; init; }
+    public double VideoOpacity { get; init; } = 1.0;
+    public ShortSourceCropMode SourceCropMode { get; init; } = ShortSourceCropMode.Auto;
+    public int CropLeft { get; init; }
+    public int CropRight { get; init; }
+    public int CropTop { get; init; }
+    public int CropBottom { get; init; }
+    public int SourceMarginX { get; init; } = 40;
+    public double SourceFadeInSeconds { get; init; } = 1.5;
     public required string FontFile { get; init; }
     public required string FfmpegPath { get; init; }
     public required string FfprobePath { get; init; }
diff --git a/Models/ShortWizard.cs b/Models/ShortWizard.cs
new file mode 100644
index 0000000..82be4f6
--- /dev/null
+++ b/Models/ShortWizard.cs
@@ -0,0 +1,63 @@
+namespace AmiReel.Models;
+
+/// <summary>One page of the Shorts create-wizard. Extra effect pages are inserted only when the style needs them.</summary>
+public enum ShortWizardStep
+{
+    Clip,
+    Effect,
+    StyleOptions,
+    Titles,
+    Encode,
+}
+
+/// <summary>Builds the Shorts wizard page list for a chosen visual style.</summary>
+public static class ShortWizard
+{
+    public static IReadOnlyList<ShortWizardStep> StepsFor(ShortStyle style)
+    {
+        List<ShortWizardStep> steps = [ShortWizardStep.Clip, ShortWizardStep.Effect];
+        if (NeedsStyleOptions(style))
+            steps.Add(ShortWizardStep.StyleOptions);
+        steps.Add(ShortWizardStep.Titles);
+        steps.Add(ShortWizardStep.Encode);
+        return steps;
+    }
+
+    public static bool NeedsStyleOptions(ShortStyle style) =>
+        style is ShortStyle.Brand or ShortStyle.Video;
+
+    public static string Title(ShortWizardStep step) => step switch
+    {
+        ShortWizardStep.Clip => "Source clip",
+        ShortWizardStep.Effect => "Visual effect",
+        ShortWizardStep.StyleOptions => "Effect settings",
+        ShortWizardStep.Titles => "Title card",
+        ShortWizardStep.Encode => "Encoding",
+        _ => "Short",
+    };
+
+    public static string Description(ShortStyle style) => style switch
+    {
+        ShortStyle.Brand => "Title-card background image with a framed source clip.",
+        ShortStyle.Pixel => "Pixelated backdrop with neon scan bars.",
+        ShortStyle.Mirror => "Reflected source strips above and below the clip.",
+        ShortStyle.Crop => "Full-frame vertical crop of the source.",
+        ShortStyle.Workbench => "Workbench-style window around the source.",
+        ShortStyle.Blur => "Blurred backdrop with a centered source.",
+        ShortStyle.Crt => "CRT curvature, scanlines, and a rolling highlight.",
+        ShortStyle.Copper => "Amiga copper bars behind the source.",
+        ShortStyle.Stars => "Twinkling star field behind a framed clip.",
+        ShortStyle.Grid => "Neon grid horizon behind the source.",
+        ShortStyle.Tiles => "Four-tile mirrored backdrop.",
+        ShortStyle.Scan => "Chunky scanlines and moving bars.",
+        ShortStyle.Starfield => "Fast-moving star streaks.",
+        ShortStyle.Plasma => "Demoscene plasma backdrop.",
+        ShortStyle.Rasterbars => "Classic raster bars above and below the clip.",
+        ShortStyle.Vhs => "Tape noise, chroma shift, and scanlines.",
+        ShortStyle.Monitor => "CRT monitor bezel around the source.",
+        ShortStyle.Split => "Split-band source strips around the main clip.",
+        ShortStyle.Spectrum => "Scrolling audio spectrum. The source video must have audio.",
+        ShortStyle.Video => "Looping background video with the Amiga clip overlaid.",
+        _ => "",
+    };
+}
diff --git a/Services/ShortsPipeline.cs b/Services/ShortsPipeline.cs
index 63ed648..9750103 100644
--- a/Services/ShortsPipeline.cs
+++ b/Services/ShortsPipeline.cs
@@ -1,17 +1,25 @@
 using System.Globalization;
 using System.IO;
 using System.Text;
+using System.Text.RegularExpressions;
 using AmiReel.Models;
 
 namespace AmiReel.Services;
 
 /// <summary>
 /// Renders a vertical (1080x1920, 50 FPS) YouTube Short from an existing video, with a chosen
-/// visual style and title-card text overlays. A C# port of amigadb-short.sh so end users don't
-/// need bash/WSL — the FFmpeg filtergraphs below are copied verbatim from that script.
+/// visual style and title-card text overlays. A C# port of amigadb-short-fx-v4.sh so end users
+/// don't need bash/WSL — the FFmpeg filtergraphs below are copied from that script.
 /// </summary>
 public sealed class ShortsPipeline
 {
+    internal const string DefaultSourceCropFilter =
+        "crop='min(iw,ih*4/3)':'min(ih,iw*3/4)':'(iw-ow)/2':'(ih-oh)/2'";
+
+    private static readonly Regex CropSpecRegex = new(
+        @"crop=(\d+):(\d+):(\d+):(\d+)",
+        RegexOptions.CultureInvariant);
+
     private readonly ProcessRunner _runner = new();
 
     public async Task RenderAsync(ShortSettings settings, IProgress<RenderProgress> progress, Action<string> log, CancellationToken token)
@@ -45,9 +53,11 @@ public sealed class ShortsPipeline
             double infoStart = Math.Max(0, duration - 7);
             double ctaStart = Math.Max(0, duration - 3.5);
             double hookEnd = Math.Min(2.7, duration);
+            double fadeIn = Math.Clamp(settings.SourceFadeInSeconds, 0, duration);
 
+            string baseFilter = await ResolveBaseFilterAsync(tools, settings, log, token);
             string filterComplex = BuildFilterComplex(
-                GetBaseFilter(settings.Style),
+                ApplySourceFade(baseFilter, fadeIn),
                 fontEsc: EscapeFfmpegPath(settings.FontFile),
                 hookEsc: EscapeFfmpegPath(hookFile),
                 titleEsc: EscapeFfmpegPath(titleFile),
@@ -58,6 +68,8 @@ public sealed class ShortsPipeline
             List<string> args = ["-hide_banner", "-y", "-ss", settings.Start, "-t", F(duration), "-i", settings.InputFile];
             if (settings.Style == ShortStyle.Brand)
                 args.AddRange(["-loop", "1", "-i", settings.BackgroundImage]);
+            if (settings.Style == ShortStyle.Video)
+                args.AddRange(["-stream_loop", "-1", "-i", settings.BackgroundVideo]);
 
             args.AddRange([
                 "-filter_complex", filterComplex,
@@ -73,6 +85,7 @@ public sealed class ShortsPipeline
                 "-b:a", "320k",
                 "-ar", "48000",
                 "-movflags", "+faststart",
+                "-t", F(duration),
                 "-shortest",
                 settings.OutputPath,
             ]);
@@ -121,6 +134,18 @@ public sealed class ShortsPipeline
             throw new FileNotFoundException("Select a bold TrueType/OpenType font file.");
         if (s.Style == ShortStyle.Brand && (string.IsNullOrWhiteSpace(s.BackgroundImage) || !File.Exists(s.BackgroundImage)))
             throw new FileNotFoundException("The brand style requires a background image.");
+        if (s.Style == ShortStyle.Video && (string.IsNullOrWhiteSpace(s.BackgroundVideo) || !File.Exists(s.BackgroundVideo)))
+            throw new FileNotFoundException("The video style requires a background video.");
+        if (s.VideoBlur < 0)
+            throw new ArgumentException("Background video blur must be zero or greater.");
+        if (s.VideoOpacity is < 0 or > 1)
+            throw new ArgumentException("Background video opacity must be between 0.0 and 1.0.");
+        if (s.CropLeft < 0 || s.CropRight < 0 || s.CropTop < 0 || s.CropBottom < 0)
+            throw new ArgumentException("Manual crop values must be non-negative.");
+        if (s.SourceMarginX < 0 || s.SourceMarginX >= 540)
+            throw new ArgumentException("Source side margin must be between 0 and 539 pixels.");
+        if (s.SourceFadeInSeconds < 0)
+            throw new ArgumentException("Source fade-in must be zero or greater.");
     }
 
     internal static string BuildMeta(ShortSettings s)
@@ -163,6 +188,137 @@ public sealed class ShortsPipeline
 
     private static string F(double value) => value.ToString("0.###", CultureInfo.InvariantCulture);
 
+    internal static string ApplySourceFade(string baseFilter, double fadeInSeconds)
+    {
+        if (fadeInSeconds <= 0)
+            return baseFilter;
+
+        return $"[0:v]format=rgba,fade=t=in:st=0:d={F(fadeInSeconds)}:alpha=1[srcfade];" +
+               baseFilter.Replace("[0:v]", "[srcfade]", StringComparison.Ordinal);
+    }
+
+    internal static int SourceTargetWidth(int sourceMarginX) => 1080 - (sourceMarginX * 2);
+
+    internal static string BuildSourceScaleFilter(int sourceMarginX) =>
+        $"scale={SourceTargetWidth(sourceMarginX)}:-2:flags=lanczos";
+
+    internal static string BuildManualCropFilter(int left, int right, int top, int bottom) =>
+        $"crop=iw-{left}-{right}:ih-{top}-{bottom}:{left}:{top}";
+
+    internal static string BuildVideoBaseFilter(string cropFilter, string scaleFilter, double blur, double opacity)
+    {
+        string blurFilter = blur > 0 ? $",gblur=sigma={F(blur)}" : "";
+        return
+            "color=c=black:s=1080x1920:r=50[black];" +
+            $"[1:v]scale=1080:1920:force_original_aspect_ratio=increase,crop=1080:1920,setsar=1{blurFilter},format=rgba,colorchannelmixer=aa={F(opacity)}[bgvideo];" +
+            "[black][bgvideo]overlay=x=0:y=0:format=auto[bg];" +
+            $"[0:v]{cropFilter},{scaleFilter},setsar=1[fg];" +
+            "[bg][fg]overlay=x=(W-w)/2:y=(H-h)/2:format=auto[base]";
+    }
+
+    internal static string? SelectMostCommonCropSpec(string ffmpegOutput)
+    {
+        Dictionary<string, int> counts = new(StringComparer.Ordinal);
+        foreach (Match match in CropSpecRegex.Matches(ffmpegOutput))
+        {
+            string spec = match.Value;
+            counts[spec] = counts.GetValueOrDefault(spec) + 1;
+        }
+
+        return counts.Count == 0
+            ? null
+            : counts.OrderByDescending(pair => pair.Value).ThenBy(pair => pair.Key, StringComparer.Ordinal).First().Key;
+    }
+
+    internal static bool TryParseCropSpec(string spec, out int width, out int height, out int x, out int y)
+    {
+        Match match = CropSpecRegex.Match(spec);
+        if (!match.Success)
+        {
+            width = height = x = y = 0;
+            return false;
+        }
+
+        width = int.Parse(match.Groups[1].Value, CultureInfo.InvariantCulture);
+        height = int.Parse(match.Groups[2].Value, CultureInfo.InvariantCulture);
+        x = int.Parse(match.Groups[3].Value, CultureInfo.InvariantCulture);
+        y = int.Parse(match.Groups[4].Value, CultureInfo.InvariantCulture);
+        return true;
+    }
+
+    internal static bool TryBuildAutoHorizontalCrop(int detectedWidth, int detectedX, out int width, out int x)
+    {
+        int inset = (int)(detectedWidth * 0.005 / 2) * 2;
+        width = ((detectedWidth - (2 * inset)) / 2) * 2;
+        x = ((detectedX + inset) / 2) * 2;
+        if (width < 16)
+            return false;
+        return true;
+    }
+
+    private async Task<string> ResolveBaseFilterAsync(
+        ToolPaths tools, ShortSettings settings, Action<string> log, CancellationToken token)
+    {
+        if (settings.Style != ShortStyle.Video)
+            return GetBaseFilter(settings.Style);
+
+        string cropFilter = DefaultSourceCropFilter;
+        string scaleFilter = BuildSourceScaleFilter(settings.SourceMarginX);
+        bool hasManualCrop = settings.CropLeft > 0 || settings.CropRight > 0
+            || settings.CropTop > 0 || settings.CropBottom > 0;
+
+        if (hasManualCrop)
+        {
+            cropFilter = BuildManualCropFilter(settings.CropLeft, settings.CropRight, settings.CropTop, settings.CropBottom);
+            log($"Source crop: manual L={settings.CropLeft} R={settings.CropRight} T={settings.CropTop} B={settings.CropBottom}");
+        }
+        else if (settings.SourceCropMode == ShortSourceCropMode.Auto)
+        {
+            string? detected = await DetectHorizontalCropAsync(tools, settings, log, token);
+            if (detected is not null)
+            {
+                cropFilter = detected;
+            }
+            else
+            {
+                log("Warning: could not auto-detect left/right source black borders; using centered 4:3 crop.");
+            }
+        }
+        else
+        {
+            log("Source crop: centered 4:3");
+        }
+
+        return BuildVideoBaseFilter(cropFilter, scaleFilter, settings.VideoBlur, settings.VideoOpacity);
+    }
+
+    private async Task<string?> DetectHorizontalCropAsync(
+        ToolPaths tools, ShortSettings settings, Action<string> log, CancellationToken token)
+    {
+        double detectDuration = Math.Clamp(settings.DurationSeconds < 4 ? settings.DurationSeconds : 4, 0.5, 4);
+        List<string> args =
+        [
+            "-hide_banner",
+            "-ss", settings.Start,
+            "-t", F(detectDuration),
+            "-i", settings.InputFile,
+            "-an",
+            "-vf", "crop=iw:trunc(ih*0.70/2)*2:0:trunc(ih*0.15/2)*2,cropdetect=limit=28:round=2:reset=0",
+            "-f", "null",
+            "-",
+        ];
+
+        string output = await _runner.RunAsync(tools.Ffmpeg, args, log, null, token, allowFailure: true);
+        string? spec = SelectMostCommonCropSpec(output);
+        if (spec is null || !TryParseCropSpec(spec, out int width, out _, out int x, out _))
+            return null;
+        if (!TryBuildAutoHorizontalCrop(width, x, out int cropWidth, out int cropX))
+            return null;
+
+        log($"Source crop: w={cropWidth}, x={cropX} (auto left/right black crop)");
+        return $"crop={cropWidth}:ih:{cropX}:0";
+    }
+
     internal static string GetBaseFilter(ShortStyle style) => style switch
     {
         ShortStyle.Brand => """
@@ -182,13 +338,14 @@ public sealed class ShortsPipeline
             """,
 
         ShortStyle.Mirror => """
-            [0:v]split=3[fg_src][top_src][bottom_src];
-            [top_src]scale=1080:620:force_original_aspect_ratio=increase,crop=1080:620,vflip,eq=brightness=-0.34:saturation=0.82,gblur=sigma=9,setsar=1[top];
-            [bottom_src]scale=1080:620:force_original_aspect_ratio=increase,crop=1080:620,vflip,eq=brightness=-0.34:saturation=0.82,gblur=sigma=9,setsar=1[bottom];
-            [fg_src]scale=1000:820:force_original_aspect_ratio=decrease,pad=iw+12:ih+12:6:6:color=white@0.70,setsar=1[fg];
-            [top]pad=1080:1920:0:0:color=0x050616[canvas];
-            [canvas][bottom]overlay=x=0:y=1300[tmp];
-            [tmp][fg]overlay=x=(W-w)/2:y=(H-h)/2:format=auto[base]
+            [0:v]split=4[canvas_src][fg_src][top_src][bottom_src];
+            [canvas_src]scale=1080:1920:force_original_aspect_ratio=increase,crop=1080:1920,setsar=1,drawbox=x=0:y=0:w=1080:h=1920:color=0x010203:t=fill[canvas];
+            [fg_src]scale=940:760:force_original_aspect_ratio=decrease,setsar=1[fg];
+            [top_src]scale=1400:470:flags=lanczos,vflip,eq=brightness=-0.48:contrast=0.92:saturation=0.68,gblur=sigma=7,setsar=1,format=rgba,geq=r='r(X,Y)':g='g(X,Y)':b='b(X,Y)':a='255*0.62*(Y/H)'[top];
+            [bottom_src]scale=1400:470:flags=lanczos,vflip,eq=brightness=-0.50:contrast=0.90:saturation=0.64,gblur=sigma=7,setsar=1,format=rgba,geq=r='r(X,Y)':g='g(X,Y)':b='b(X,Y)':a='255*0.58*(1-Y/H)'[bottom];
+            [canvas][top]overlay=x=(W-w)/2:y=250:format=auto[tmp1];
+            [tmp1][bottom]overlay=x=(W-w)/2:y=1435:format=auto[tmp2];
+            [tmp2][fg]overlay=x=(W-w)/2:y=(H-h)/2:format=auto[base]
             """,
 
         ShortStyle.Crop => """
@@ -381,6 +538,9 @@ public sealed class ShortsPipeline
             [tmp][fg]overlay=x=(W-w)/2:y=480:format=auto[base]
             """,
 
+        ShortStyle.Video => BuildVideoBaseFilter(
+            DefaultSourceCropFilter, BuildSourceScaleFilter(40), blur: 0, opacity: 1),
+
         _ => throw new ArgumentOutOfRangeException(nameof(style), style, "Unknown short style."),
     };
 }
diff --git a/amigadb-short-fx-v4.sh b/amigadb-short-fx-v4.sh
new file mode 100644
index 0000000..9ae4f80
--- /dev/null
+++ b/amigadb-short-fx-v4.sh
@@ -0,0 +1,904 @@
+#!/usr/bin/env bash
+set -Eeuo pipefail
+
+# AmigaDB YouTube Shorts generator
+# Creates a 1080x1920, 50 FPS vertical MP4 from an existing Amiga video.
+# V4 expanded style pack for 4:3 Amiga footage, with demoscene-inspired FX and optional image/video backgrounds.
+
+SCRIPT_NAME="$(basename "$0")"
+SCRIPT_VERSION="4.2"
+
+INPUT=""
+OUTPUT=""
+START="00:00:00"
+DURATION="30"
+TITLE=""
+GROUP=""
+YEAR=""
+TYPE=""
+HOOK="THIS RAN ON AN AMIGA"
+WEBSITE="AMIGADB.NET"
+FONT_FILE=""
+STYLE="brand"
+BACKGROUND_IMAGE="amigadb_short.png"
+BACKGROUND_VIDEO=""
+VIDEO_BLUR="0"
+VIDEO_OPACITY="1.0"
+SOURCE_CROP_MODE="auto"
+CROP_LEFT="0"
+CROP_RIGHT="0"
+CROP_TOP="0"
+CROP_BOTTOM="0"
+SOURCE_MARGIN_X="40"
+SOURCE_FADE_IN="1.5"
+CRF="16"
+PRESET="slow"
+
+usage() {
+    cat <<USAGE
+Usage:
+  $SCRIPT_NAME --input VIDEO --title TITLE [options]
+
+Required:
+  --input FILE          Source video
+  --title TEXT          Production title
+
+Production metadata:
+  --group TEXT          Group / creator
+  --year YEAR           Release year
+  --type TEXT           Demo, Intro, Cracktro, Music Disk, ...
+  --hook TEXT           Opening hook (default: THIS RAN ON AN AMIGA)
+  --website TEXT        Closing website text (default: AMIGADB.NET)
+
+Clip settings:
+  --start TIME          Start position, e.g. 00:01:23.500 (default: 00:00:00)
+  --duration SECONDS    Output duration in seconds (default: 30)
+  --output FILE         Output MP4 path
+
+Visual style:
+  --style NAME          brand, pixel, mirror, crop, workbench, blur,
+                        crt, copper, stars, grid, tiles, scan,
+                        starfield, plasma, rasterbars, vhs,
+                        monitor, split, spectrum, video
+                        default: brand
+
+  --background-image    Background image for brand style
+                        default: amigadb_short.png
+
+  --background-video    Background video file for video style
+  --video-blur NUMBER   Background video blur sigma (default: 0 = no blur)
+  --video-opacity NUM   Background video opacity 0.0-1.0 (default: 1.0)
+  --source-crop MODE     Source crop for video style: auto or center (default: auto)
+                        auto detects/removes black left/right borders
+  --crop-left PX         Manually crop PX pixels from source left edge (default: 0)
+  --crop-right PX        Manually crop PX pixels from source right edge (default: 0)
+  --crop-top PX          Manually crop PX pixels from source top edge (default: 0)
+  --crop-bottom PX       Manually crop PX pixels from source bottom edge (default: 0)
+                        Any manual crop value overrides --source-crop auto/center
+  --source-margin-x PX    Left/right margin around source video in final 1080px frame
+                        (default: 40; use 0 for edge-to-edge)
+  --source-fade-in SEC    Source overlay fade-in at start, in seconds
+                        (default: 1.5; use 0 to disable)
+
+Encoding:
+  --font FILE           Bold TrueType/OpenType font file
+  --crf NUMBER          H.264 quality; lower is better (default: 16)
+  --preset NAME         x264 preset (default: slow)
+
+Other:
+  -h, --help            Show this help
+  --version             Show script version
+
+Examples:
+  $SCRIPT_NAME \
+    --input "ami-back.mp4" \
+    --start "00:00:34" \
+    --duration 30 \
+    --title "Ami-Back V1.04A" \
+    --group "Pirates" \
+    --year "1991" \
+    --type "Cracktro" \
+    --hook "A 1991 AMIGA CRACKTRO" \
+    --style brand \
+    --background-image "amigadb_short.png" \
+    --output "ami-back-brand-short.mp4"
+
+  $SCRIPT_NAME \
+    --input "demo.mp4" \
+    --title "Demo Title" \
+    --group "Demo Group" \
+    --year "1992" \
+    --type "Demo" \
+    --style crt
+
+  $SCRIPT_NAME \
+    --input "demo.mp4" \
+    --title "Demo Title" \
+    --style video \
+    --background-video "backgrounds/neon-tunnel.mp4" \
+    --video-blur 8 \
+    --video-opacity 0.65 \
+    --crop-left 120 \
+    --crop-right 120 \
+    --crop-top 0 \
+    --crop-bottom 0 \
+    --source-margin-x 40 \
+    --output "demo-video-short.mp4"
+USAGE
+}
+
+fail() {
+    printf 'Error: %s\n' "$*" >&2
+    exit 1
+}
+
+command_exists() {
+    command -v "$1" >/dev/null 2>&1
+}
+
+find_default_font() {
+    local candidate=""
+
+    if command_exists fc-match; then
+        candidate="$(fc-match -f '%{file}\n' 'DejaVu Sans:style=Bold' 2>/dev/null | head -n 1 || true)"
+        if [[ -n "$candidate" && -f "$candidate" ]]; then
+            printf '%s\n' "$candidate"
+            return 0
+        fi
+    fi
+
+    for candidate in \
+        /usr/share/fonts/truetype/dejavu/DejaVuSans-Bold.ttf \
+        /usr/share/fonts/truetype/liberation2/LiberationSans-Bold.ttf \
+        /usr/share/fonts/opentype/noto/NotoSans-Bold.ttf; do
+        if [[ -f "$candidate" ]]; then
+            printf '%s\n' "$candidate"
+            return 0
+        fi
+    done
+
+    return 1
+}
+
+while (($#)); do
+    case "$1" in
+        --input)
+            (($# >= 2)) || fail "Missing value after --input"
+            INPUT="$2"
+            shift 2
+            ;;
+        --output)
+            (($# >= 2)) || fail "Missing value after --output"
+            OUTPUT="$2"
+            shift 2
+            ;;
+        --start)
+            (($# >= 2)) || fail "Missing value after --start"
+            START="$2"
+            shift 2
+            ;;
+        --duration)
+            (($# >= 2)) || fail "Missing value after --duration"
+            DURATION="$2"
+            shift 2
+            ;;
+        --title)
+            (($# >= 2)) || fail "Missing value after --title"
+            TITLE="$2"
+            shift 2
+            ;;
+        --group)
+            (($# >= 2)) || fail "Missing value after --group"
+            GROUP="$2"
+            shift 2
+            ;;
+        --year)
+            (($# >= 2)) || fail "Missing value after --year"
+            YEAR="$2"
+            shift 2
+            ;;
+        --type)
+            (($# >= 2)) || fail "Missing value after --type"
+            TYPE="$2"
+            shift 2
+            ;;
+        --hook)
+            (($# >= 2)) || fail "Missing value after --hook"
+            HOOK="$2"
+            shift 2
+            ;;
+        --website)
+            (($# >= 2)) || fail "Missing value after --website"
+            WEBSITE="$2"
+            shift 2
+            ;;
+        --font)
+            (($# >= 2)) || fail "Missing value after --font"
+            FONT_FILE="$2"
+            shift 2
+            ;;
+        --background-image|--background)
+            (($# >= 2)) || fail "Missing value after --background-image"
+            BACKGROUND_IMAGE="$2"
+            shift 2
+            ;;
+        --background-video)
+            (($# >= 2)) || fail "Missing value after --background-video"
+            BACKGROUND_VIDEO="$2"
+            shift 2
+            ;;
+        --video-blur|--background-video-blur)
+            (($# >= 2)) || fail "Missing value after --video-blur"
+            VIDEO_BLUR="$2"
+            shift 2
+            ;;
+        --video-opacity|--background-video-opacity)
+            (($# >= 2)) || fail "Missing value after --video-opacity"
+            VIDEO_OPACITY="$2"
+            shift 2
+            ;;
+        --source-crop)
+            (($# >= 2)) || fail "Missing value after --source-crop"
+            SOURCE_CROP_MODE="${2,,}"
+            shift 2
+            ;;
+        --crop-left|--source-crop-left)
+            (($# >= 2)) || fail "Missing value after --crop-left"
+            CROP_LEFT="$2"
+            shift 2
+            ;;
+        --crop-right|--source-crop-right)
+            (($# >= 2)) || fail "Missing value after --crop-right"
+            CROP_RIGHT="$2"
+            shift 2
+            ;;
+        --crop-top|--source-crop-top)
+            (($# >= 2)) || fail "Missing value after --crop-top"
+            CROP_TOP="$2"
+            shift 2
+            ;;
+        --crop-bottom|--source-crop-bottom)
+            (($# >= 2)) || fail "Missing value after --crop-bottom"
+            CROP_BOTTOM="$2"
+            shift 2
+            ;;
+        --source-margin-x|--video-margin-x|--source-margin)
+            (($# >= 2)) || fail "Missing value after --source-margin-x"
+            SOURCE_MARGIN_X="$2"
+            shift 2
+            ;;
+        --source-fade-in|--source-fade|--fade-in)
+            (($# >= 2)) || fail "Missing value after --source-fade-in"
+            SOURCE_FADE_IN="$2"
+            shift 2
+            ;;
+        --style)
+            (($# >= 2)) || fail "Missing value after --style"
+            STYLE="${2,,}"
+            shift 2
+            ;;
+        --crf)
+            (($# >= 2)) || fail "Missing value after --crf"
+            CRF="$2"
+            shift 2
+            ;;
+        --preset)
+            (($# >= 2)) || fail "Missing value after --preset"
+            PRESET="$2"
+            shift 2
+            ;;
+        --version)
+            printf "%s v%s\n" "$SCRIPT_NAME" "$SCRIPT_VERSION"
+            exit 0
+            ;;
+        -h|--help)
+            usage
+            exit 0
+            ;;
+        *)
+            fail "Unknown argument: $1"
+            ;;
+    esac
+done
+
+command_exists ffmpeg || fail "ffmpeg is not installed or not in PATH"
+[[ -n "$INPUT" ]] || fail "--input is required"
+[[ -f "$INPUT" ]] || fail "Input file not found: $INPUT"
+[[ -n "$TITLE" ]] || fail "--title is required"
+[[ "$DURATION" =~ ^[0-9]+([.][0-9]+)?$ ]] || fail "--duration must be a positive number"
+awk -v d="$DURATION" 'BEGIN { exit !(d > 0) }' || fail "--duration must be greater than zero"
+[[ "$CRF" =~ ^[0-9]+$ ]] || fail "--crf must be an integer"
+[[ "$VIDEO_BLUR" =~ ^[0-9]+([.][0-9]+)?$ ]] || fail "--video-blur must be zero or a positive number"
+awk -v v="$VIDEO_BLUR" 'BEGIN { exit !(v >= 0) }' || fail "--video-blur must be zero or greater"
+[[ "$VIDEO_OPACITY" =~ ^([0-9]+([.][0-9]+)?|[.][0-9]+)$ ]] || fail "--video-opacity must be a number between 0.0 and 1.0"
+awk -v v="$VIDEO_OPACITY" 'BEGIN { exit !(v >= 0 && v <= 1) }' || fail "--video-opacity must be between 0.0 and 1.0"
+case "$SOURCE_CROP_MODE" in
+    auto|center) ;;
+    *) fail "--source-crop must be 'auto' or 'center'" ;;
+esac
+
+for crop_value in "$CROP_LEFT" "$CROP_RIGHT" "$CROP_TOP" "$CROP_BOTTOM"; do
+    [[ "$crop_value" =~ ^[0-9]+$ ]] || fail "Manual crop values must be non-negative integer pixel values"
+done
+[[ "$SOURCE_MARGIN_X" =~ ^[0-9]+$ ]] || fail "--source-margin-x must be a non-negative integer pixel value"
+(( SOURCE_MARGIN_X < 540 )) || fail "--source-margin-x must be less than 540"
+SOURCE_TARGET_WIDTH=$((1080 - (SOURCE_MARGIN_X * 2)))
+[[ "$SOURCE_FADE_IN" =~ ^([0-9]+([.][0-9]+)?|[.][0-9]+)$ ]] || fail "--source-fade-in must be zero or a positive number"
+awk -v v="$SOURCE_FADE_IN" 'BEGIN { exit !(v >= 0) }' || fail "--source-fade-in must be zero or greater"
+SOURCE_FADE_IN="$(awk -v v="$SOURCE_FADE_IN" -v d="$DURATION" 'BEGIN {
+    if (v > d) v = d;
+    printf "%.3f", v;
+}')"
+
+case "$STYLE" in
+    brand|pixel|mirror|crop|workbench|blur|crt|copper|stars|grid|tiles|scan|starfield|plasma|rasterbars|vhs|monitor|split|spectrum|video)
+        ;;
+    *)
+        fail "Unknown style '$STYLE'. Use brand, pixel, mirror, crop, workbench, blur, crt, copper, stars, grid, tiles, scan, starfield, plasma, rasterbars, vhs, monitor, split, spectrum, or video"
+        ;;
+esac
+
+if [[ -z "$FONT_FILE" ]]; then
+    FONT_FILE="$(find_default_font || true)"
+fi
+[[ -n "$FONT_FILE" && -f "$FONT_FILE" ]] || fail "No usable font found. Install fonts-dejavu-core or use --font FILE"
+
+if [[ -z "$OUTPUT" ]]; then
+    base="$(basename "$INPUT")"
+    base="${base%.*}"
+    OUTPUT="${base}-${STYLE}-short.mp4"
+fi
+
+mkdir -p "$(dirname "$OUTPUT")"
+
+TMP_DIR="$(mktemp -d -t amigadb-short.XXXXXX)"
+cleanup() {
+    rm -rf "$TMP_DIR"
+}
+trap cleanup EXIT
+
+printf '%s\n' "$HOOK" > "$TMP_DIR/hook.txt"
+printf '%s\n' "$TITLE" > "$TMP_DIR/title.txt"
+
+META_PARTS=()
+[[ -n "$GROUP" ]] && META_PARTS+=("$GROUP")
+[[ -n "$YEAR" ]] && META_PARTS+=("$YEAR")
+[[ -n "$TYPE" ]] && META_PARTS+=("$TYPE")
+
+META=""
+if ((${#META_PARTS[@]})); then
+    for part in "${META_PARTS[@]}"; do
+        if [[ -n "$META" ]]; then
+            META+=" · "
+        fi
+        META+="$part"
+    done
+fi
+
+printf '%s\n' "$META" > "$TMP_DIR/meta.txt"
+printf '%s\n' "$WEBSITE" > "$TMP_DIR/website.txt"
+
+INFO_START="$(awk -v d="$DURATION" 'BEGIN { v=d-7; if (v<0) v=0; printf "%.3f", v }')"
+CTA_START="$(awk -v d="$DURATION" 'BEGIN { v=d-3.5; if (v<0) v=0; printf "%.3f", v }')"
+HOOK_END="$(awk -v d="$DURATION" 'BEGIN { v=2.7; if (d<v) v=d; printf "%.3f", v }')"
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+resolve_path() {
+    local p="$1"
+    if [[ -f "$p" ]]; then
+        printf "%s\n" "$p"
+        return 0
+    fi
+    if [[ -f "$SCRIPT_DIR/$p" ]]; then
+        printf "%s\n" "$SCRIPT_DIR/$p"
+        return 0
+    fi
+    return 1
+}
+
+# Detect left/right black capture borders while deliberately ignoring the top
+# and bottom 15% of the frame. This prevents full-width overscan/raster lines
+# near the top/bottom from fooling cropdetect. Used by --style video.
+detect_source_horizontal_crop() {
+    local detect_duration candidate crop_spec
+
+    detect_duration="$(awk -v d="$DURATION" 'BEGIN { v=(d<4?d:4); if (v<0.5) v=0.5; printf "%.3f", v }')"
+
+    # Inspect only the middle 70% vertically, then use cropdetect to locate the
+    # active horizontal picture. We only keep W and X; the source keeps its full
+    # height so this specifically removes left/right black borders.
+    candidate="$({
+        ffmpeg -hide_banner -ss "$START" -t "$detect_duration" -i "$INPUT" \
+            -an -vf "crop=iw:trunc(ih*0.70/2)*2:0:trunc(ih*0.15/2)*2,cropdetect=limit=28:round=2:reset=0" \
+            -f null - 2>&1 || true
+    } | grep -oE 'crop=[0-9]+:[0-9]+:[0-9]+:[0-9]+' \
+      | sort | uniq -c | sort -nr | head -n 1 | awk '{print $2}' || true)"
+
+    [[ "$candidate" =~ ^crop=([0-9]+):([0-9]+):([0-9]+):([0-9]+)$ ]] || return 1
+
+    local w="${BASH_REMATCH[1]}"
+    local x="${BASH_REMATCH[3]}"
+
+    # cropdetect can occasionally leave a few black pixels at each side. Trim a
+    # tiny extra safety margin (0.5% of detected width per side), still keeping
+    # even dimensions/offsets for H.264 compatibility.
+    crop_spec="$(awk -v w="$w" -v x="$x" 'BEGIN {
+        inset = int((w * 0.005) / 2) * 2;
+        nw = w - (2 * inset);
+        nx = x + inset;
+        nw = int(nw / 2) * 2;
+        nx = int(nx / 2) * 2;
+        if (nw < 16) exit 1;
+        printf "%d:%d", nw, nx;
+    }')" || return 1
+
+    [[ -n "$crop_spec" ]] || return 1
+    printf '%s\n' "$crop_spec"
+}
+
+if [[ "$STYLE" == "brand" ]]; then
+    BACKGROUND_IMAGE="$(resolve_path "$BACKGROUND_IMAGE" || true)"
+    [[ -n "$BACKGROUND_IMAGE" && -f "$BACKGROUND_IMAGE" ]] || fail "Brand style requires background image. Put amigadb_short.png next to the script or pass --background-image FILE"
+fi
+
+if [[ "$STYLE" == "video" ]]; then
+    [[ -n "$BACKGROUND_VIDEO" ]] || fail "Video style requires --background-video FILE"
+    BACKGROUND_VIDEO="$(resolve_path "$BACKGROUND_VIDEO" || true)"
+    [[ -n "$BACKGROUND_VIDEO" && -f "$BACKGROUND_VIDEO" ]] || fail "Background video not found. Pass a valid file with --background-video FILE"
+fi
+
+SOURCE_CROP_FILTER="crop='min(iw,ih*4/3)':'min(ih,iw*3/4)':'(iw-ow)/2':'(ih-oh)/2'"
+SOURCE_SCALE_FILTER="scale=${SOURCE_TARGET_WIDTH}:-2:flags=lanczos"
+SOURCE_CROP_SPEC="centered 4:3"
+
+MANUAL_CROP=0
+if (( CROP_LEFT > 0 || CROP_RIGHT > 0 || CROP_TOP > 0 || CROP_BOTTOM > 0 )); then
+    MANUAL_CROP=1
+fi
+
+if [[ "$STYLE" == "video" && "$MANUAL_CROP" -eq 1 ]]; then
+    # Manual values are pixels removed from each source edge. Manual crop takes
+    # precedence over automatic/center crop modes. Scale the remaining picture
+    # to the configured Short source width while preserving its aspect ratio.
+    SOURCE_CROP_FILTER="crop=iw-${CROP_LEFT}-${CROP_RIGHT}:ih-${CROP_TOP}-${CROP_BOTTOM}:${CROP_LEFT}:${CROP_TOP}"
+    SOURCE_SCALE_FILTER="scale=${SOURCE_TARGET_WIDTH}:-2:flags=lanczos"
+    SOURCE_CROP_SPEC="manual L=${CROP_LEFT} R=${CROP_RIGHT} T=${CROP_TOP} B=${CROP_BOTTOM}"
+elif [[ "$STYLE" == "video" && "$SOURCE_CROP_MODE" == "auto" ]]; then
+    DETECTED_SOURCE_CROP="$(detect_source_horizontal_crop || true)"
+    if [[ -n "$DETECTED_SOURCE_CROP" ]]; then
+        DETECTED_W="${DETECTED_SOURCE_CROP%%:*}"
+        DETECTED_X="${DETECTED_SOURCE_CROP##*:}"
+        SOURCE_CROP_FILTER="crop=${DETECTED_W}:ih:${DETECTED_X}:0"
+        SOURCE_SCALE_FILTER="scale=${SOURCE_TARGET_WIDTH}:-2:flags=lanczos"
+        SOURCE_CROP_SPEC="w=${DETECTED_W}, x=${DETECTED_X} (auto left/right black crop)"
+    else
+        printf 'Warning: could not auto-detect left/right source black borders; using centered 4:3 crop.\n' >&2
+    fi
+fi
+
+# Escape paths for FFmpeg filter option parsing.
+ffmpeg_escape_path() {
+    local value="$1"
+    value="${value//\\/\\\\}"
+    value="${value//:/\\:}"
+    value="${value//\'/\\\'}"
+    printf '%s' "$value"
+}
+
+FONT_ESC="$(ffmpeg_escape_path "$FONT_FILE")"
+HOOK_ESC="$(ffmpeg_escape_path "$TMP_DIR/hook.txt")"
+TITLE_ESC="$(ffmpeg_escape_path "$TMP_DIR/title.txt")"
+META_ESC="$(ffmpeg_escape_path "$TMP_DIR/meta.txt")"
+WEBSITE_ESC="$(ffmpeg_escape_path "$TMP_DIR/website.txt")"
+BACKGROUND_ESC=""
+if [[ "$STYLE" == "brand" ]]; then
+    BACKGROUND_ESC="$(ffmpeg_escape_path "$BACKGROUND_IMAGE")"
+fi
+
+HOOK_BOX_Y=0
+HOOK_BOX_H=245
+HOOK_TEXT_Y=70
+HOOK_FONT_SIZE=70
+INFO_BOX_Y=1490
+INFO_BOX_H=430
+TITLE_TEXT_Y=1560
+TITLE_FONT_SIZE=62
+META_TEXT_Y=1655
+META_FONT_SIZE=42
+WEBSITE_TEXT_Y=1780
+WEBSITE_FONT_SIZE=52
+
+if [[ "$STYLE" == "brand" ]]; then
+    HOOK_BOX_Y=250
+    HOOK_BOX_H=140
+    HOOK_TEXT_Y=285
+    HOOK_FONT_SIZE=60
+    INFO_BOX_Y=1310
+    INFO_BOX_H=270
+    TITLE_TEXT_Y=1360
+    TITLE_FONT_SIZE=56
+    META_TEXT_Y=1435
+    META_FONT_SIZE=38
+    WEBSITE_TEXT_Y=1510
+    WEBSITE_FONT_SIZE=48
+fi
+
+HAS_AUDIO=0
+if command_exists ffprobe && ffprobe -v error -select_streams a:0 -show_entries stream=index -of csv=p=0 "$INPUT" | grep -q .; then
+    HAS_AUDIO=1
+fi
+
+if [[ "$STYLE" == "spectrum" && "$HAS_AUDIO" -ne 1 ]]; then
+    fail "The spectrum style requires an audio stream in the source video"
+fi
+
+case "$STYLE" in
+    brand)
+        BASE_FILTER=$(cat <<'FILTER'
+[1:v]scale=1080:1920:force_original_aspect_ratio=increase,crop=1080:1920,setsar=1[bg];
+[0:v]scale=920:700:force_original_aspect_ratio=decrease,pad=iw+16:ih+16:8:8:color=0x07111f,setsar=1,eq=contrast=1.02:saturation=1.02[fg];
+[bg]drawbox=x=65:y=505:w=950:h=730:color=black@0.22:t=fill[bg2];
+[bg2][fg]overlay=x=(W-w)/2:y=520:format=auto[base]
+FILTER
+)
+        ;;
+
+    pixel)
+        BASE_FILTER=$(cat <<'FILTER'
+[0:v]split=2[bg_src][fg_src];
+[bg_src]scale=270:480:force_original_aspect_ratio=increase,crop=270:480,scale=1080:1920:flags=neighbor,eq=brightness=-0.36:saturation=1.18,gblur=sigma=2,setsar=1[bg];
+[fg_src]scale=1000:820:force_original_aspect_ratio=decrease,pad=iw+16:ih+16:8:8:color=0x55c8ff,setsar=1[fg];
+[bg][fg]overlay=x=(W-w)/2:y=(H-h)/2:format=auto,
+drawbox=x=0:y='300+20*sin(t*1.70)':w=1080:h=8:color=0x55c8ff@0.72:t=fill,
+drawbox=x=0:y='1610+18*sin(t*1.35)':w=1080:h=8:color=0xff7020@0.72:t=fill[base]
+FILTER
+)
+        ;;
+
+    mirror)
+        BASE_FILTER=$(cat <<'FILTER'
+[0:v]split=4[canvas_src][fg_src][top_src][bottom_src];
+[canvas_src]scale=1080:1920:force_original_aspect_ratio=increase,crop=1080:1920,setsar=1,drawbox=x=0:y=0:w=1080:h=1920:color=0x010203:t=fill[canvas];
+[fg_src]scale=940:760:force_original_aspect_ratio=decrease,setsar=1[fg];
+[top_src]scale=1400:470:flags=lanczos,vflip,eq=brightness=-0.48:contrast=0.92:saturation=0.68,gblur=sigma=7,setsar=1,format=rgba,geq=r='r(X,Y)':g='g(X,Y)':b='b(X,Y)':a='255*0.62*(Y/H)'[top];
+[bottom_src]scale=1400:470:flags=lanczos,vflip,eq=brightness=-0.50:contrast=0.90:saturation=0.64,gblur=sigma=7,setsar=1,format=rgba,geq=r='r(X,Y)':g='g(X,Y)':b='b(X,Y)':a='255*0.58*(1-Y/H)'[bottom];
+[canvas][top]overlay=x=(W-w)/2:y=250:format=auto[tmp1];
+[tmp1][bottom]overlay=x=(W-w)/2:y=1435:format=auto[tmp2];
+[tmp2][fg]overlay=x=(W-w)/2:y=(H-h)/2:format=auto[base]
+FILTER
+)
+        ;;
+
+    crop)
+        BASE_FILTER=$(cat <<'FILTER'
+[0:v]scale=1080:1920:force_original_aspect_ratio=increase,crop=1080:1920,setsar=1,eq=brightness=-0.04:saturation=1.05[base]
+FILTER
+)
+        ;;
+
+    workbench)
+        BASE_FILTER=$(cat <<'FILTER'
+[0:v]split=2[canvas_src][screen_src];
+[canvas_src]scale=1080:1920:force_original_aspect_ratio=increase,crop=1080:1920,setsar=1,
+drawbox=x=0:y=0:w=1080:h=1920:color=0x090c20:t=fill,
+drawbox=x=55:y=410:w=970:h=930:color=0xc4c8d0:t=fill,
+drawbox=x=70:y=425:w=940:h=900:color=0x1b4f9c:t=fill,
+drawbox=x=70:y=425:w=940:h=74:color=0xf28c28:t=fill,
+drawbox=x=88:y=445:w=34:h=34:color=0x111111:t=fill[window];
+[screen_src]scale=960:760:force_original_aspect_ratio=decrease,pad=iw+10:ih+10:5:5:color=0xffffff,setsar=1[screen];
+[window][screen]overlay=x=(W-w)/2:y=525:format=auto[base]
+FILTER
+)
+        ;;
+
+    blur)
+        BASE_FILTER=$(cat <<'FILTER'
+[0:v]split=2[bg_src][fg_src];
+[bg_src]scale=1080:1920:force_original_aspect_ratio=increase,crop=1080:1920,gblur=sigma=35,eq=brightness=-0.22:saturation=0.85,setsar=1[bg];
+[fg_src]scale=1080:900:force_original_aspect_ratio=decrease,setsar=1[fg];
+[bg][fg]overlay=x=(W-w)/2:y=(H-h)/2:format=auto[base]
+FILTER
+)
+        ;;
+
+    crt)
+        BASE_FILTER=$(cat <<'FILTER'
+[0:v]split=2[bg_src][fg_src];
+[bg_src]scale=1080:1920:force_original_aspect_ratio=increase,crop=1080:1920,gblur=sigma=28,eq=brightness=-0.45:saturation=0.55,setsar=1[bg];
+[fg_src]scale=980:800:force_original_aspect_ratio=decrease,lenscorrection=k1=-0.060:k2=0.020,vignette=angle=PI/5,eq=contrast=1.08:saturation=1.10,setsar=1,
+drawgrid=width=iw:height=4:thickness=1:color=black@0.18[fg];
+[bg][fg]overlay=x=(W-w)/2:y=(H-h)/2:format=auto,
+drawbox=x=50:y='220+mod(t*340,1480)':w=980:h=4:color=white@0.08:t=fill[base]
+FILTER
+)
+        ;;
+
+    copper)
+        BASE_FILTER=$(cat <<'FILTER'
+[0:v]split=2[bg_src][fg_src];
+[bg_src]scale=1080:1920:force_original_aspect_ratio=increase,crop=1080:1920,eq=brightness=-0.50:saturation=0.80,gblur=sigma=18,setsar=1,
+drawbox=x=0:y=0:w=1080:h=1920:color=0x061a5f@0.55:t=fill,
+drawbox=x=0:y='220+20*sin(t*1.00)':w=1080:h=140:color=0x123fcb@0.28:t=fill,
+drawbox=x=0:y='420+24*sin(t*1.20)':w=1080:h=100:color=0x2b8cff@0.22:t=fill,
+drawbox=x=0:y='660+16*sin(t*1.50)':w=1080:h=120:color=0x00b8ff@0.18:t=fill,
+drawbox=x=0:y='1110+22*sin(t*1.10)':w=1080:h=150:color=0xff7a1f@0.20:t=fill,
+drawbox=x=0:y='1360+18*sin(t*1.30)':w=1080:h=110:color=0xffc120@0.18:t=fill,
+drawbox=x=0:y='1660+15*sin(t*1.70)':w=1080:h=130:color=0x58d4ff@0.18:t=fill[bg];
+[fg_src]scale=1000:820:force_original_aspect_ratio=decrease,pad=iw+14:ih+14:7:7:color=0xffffff,setsar=1[fg];
+[bg][fg]overlay=x=(W-w)/2:y=(H-h)/2:format=auto[base]
+FILTER
+)
+        ;;
+
+    stars)
+        BASE_FILTER=$(cat <<'FILTER'
+[0:v]split=2[bg_src][fg_src];
+[bg_src]scale=1080:1920:force_original_aspect_ratio=increase,crop=1080:1920,gblur=sigma=30,eq=brightness=-0.72:saturation=0.28,setsar=1,
+drawbox=x=0:y=0:w=1080:h=1920:color=0x05081b@0.75:t=fill,
+drawbox=x='mod(100+80*t,1080)':y='mod(80+210*t,1920)':w=3:h=3:color=white@0.95:t=fill,
+drawbox=x='mod(880-55*t,1080)':y='mod(220+170*t,1920)':w=2:h=2:color=white@0.85:t=fill,
+drawbox=x='mod(300+120*t,1080)':y='mod(520+140*t,1920)':w=3:h=3:color=0x9ad8ff@0.90:t=fill,
+drawbox=x='mod(980-75*t,1080)':y='mod(710+160*t,1920)':w=2:h=2:color=white@0.80:t=fill,
+drawbox=x='mod(420+65*t,1080)':y='mod(1040+200*t,1920)':w=4:h=4:color=0xffd46b@0.85:t=fill,
+drawbox=x='mod(750-90*t,1080)':y='mod(1280+110*t,1920)':w=2:h=2:color=white@0.88:t=fill,
+drawbox=x='mod(210+75*t,1080)':y='mod(1440+180*t,1920)':w=3:h=3:color=0x9ad8ff@0.90:t=fill,
+drawbox=x='mod(1030-60*t,1080)':y='mod(1680+140*t,1920)':w=2:h=2:color=white@0.82:t=fill,
+drawbox=x='mod(560+95*t,1080)':y='mod(260+260*t,1920)':w=2:h=2:color=white@0.92:t=fill,
+drawbox=x='mod(60+110*t,1080)':y='mod(860+120*t,1920)':w=3:h=3:color=0xffd46b@0.82:t=fill[bg];
+[fg_src]scale=1000:820:force_original_aspect_ratio=decrease,pad=iw+12:ih+12:6:6:color=0x55c8ff,setsar=1[fg];
+[bg][fg]overlay=x=(W-w)/2:y=(H-h)/2:format=auto[base]
+FILTER
+)
+        ;;
+
+    grid)
+        BASE_FILTER=$(cat <<'FILTER'
+[0:v]split=2[bg_src][fg_src];
+[bg_src]scale=1080:1920:force_original_aspect_ratio=increase,crop=1080:1920,gblur=sigma=24,eq=brightness=-0.62:saturation=0.36,setsar=1,
+drawbox=x=0:y=0:w=1080:h=1920:color=0x090b17@0.72:t=fill,
+drawgrid=width=90:height=90:thickness=2:color=0x39d2ff@0.18,
+drawbox=x=0:y=0:w=1080:h=1120:color=0x050814@0.80:t=fill,
+drawbox=x=0:y=1120:w=1080:h=4:color=0xff54d9@0.70:t=fill[bg];
+[fg_src]scale=1000:820:force_original_aspect_ratio=decrease,pad=iw+14:ih+14:7:7:color=0xff54d9,setsar=1[fg];
+[bg][fg]overlay=x=(W-w)/2:y=(H-h)/2:format=auto[base]
+FILTER
+)
+        ;;
+
+    tiles)
+        BASE_FILTER=$(cat <<'FILTER'
+[0:v]split=5[fg_src][a][b][c][d];
+[a]scale=540:960:force_original_aspect_ratio=increase,crop=540:960,eq=brightness=-0.45:saturation=0.68,gblur=sigma=4,setsar=1[ta];
+[b]scale=540:960:force_original_aspect_ratio=increase,crop=540:960,hflip,eq=brightness=-0.45:saturation=0.68,gblur=sigma=4,setsar=1[tb];
+[c]scale=540:960:force_original_aspect_ratio=increase,crop=540:960,vflip,eq=brightness=-0.45:saturation=0.68,gblur=sigma=4,setsar=1[tc];
+[d]scale=540:960:force_original_aspect_ratio=increase,crop=540:960,hflip,vflip,eq=brightness=-0.45:saturation=0.68,gblur=sigma=4,setsar=1[td];
+[ta][tb]hstack=inputs=2[top];
+[tc][td]hstack=inputs=2[bottom];
+[top][bottom]vstack=inputs=2[bg];
+[fg_src]scale=980:800:force_original_aspect_ratio=decrease,pad=iw+16:ih+16:8:8:color=0xffffff,setsar=1[fg];
+[bg][fg]overlay=x=(W-w)/2:y=(H-h)/2:format=auto[base]
+FILTER
+)
+        ;;
+
+    scan)
+        BASE_FILTER=$(cat <<'FILTER'
+[0:v]split=2[bg_src][fg_src];
+[bg_src]scale=1080:1920:force_original_aspect_ratio=increase,crop=1080:1920,scale=360:640:flags=neighbor,scale=1080:1920:flags=neighbor,eq=brightness=-0.44:saturation=1.05,gblur=sigma=2,setsar=1[bg];
+[fg_src]scale=1000:820:force_original_aspect_ratio=decrease,pad=iw+16:ih+16:8:8:color=0x55c8ff,setsar=1[fg];
+[bg][fg]overlay=x=(W-w)/2:y=(H-h)/2:format=auto,
+drawbox=x=40:y='220+mod(t*380,1480)':w=1000:h=8:color=white@0.14:t=fill,
+drawbox=x=0:y='280+20*sin(t*1.40)':w=1080:h=6:color=0x55c8ff@0.45:t=fill,
+drawbox=x=0:y='1640+15*sin(t*1.20)':w=1080:h=6:color=0xff7020@0.45:t=fill[base]
+FILTER
+)
+        ;;
+
+    starfield)
+        BASE_FILTER=$(cat <<'FILTER'
+[0:v]split=2[bg_src][fg_src];
+[bg_src]scale=1080:1920:force_original_aspect_ratio=increase,crop=1080:1920,gblur=sigma=32,eq=brightness=-0.78:saturation=0.22,setsar=1,
+drawbox=x=0:y=0:w=1080:h=1920:color=0x020511@0.82:t=fill,
+drawbox=x='mod(120+75*t,1080)':y='mod(80+520*t,1920)':w=3:h=18:color=white@0.92:t=fill,
+drawbox=x='mod(970-55*t,1080)':y='mod(250+430*t,1920)':w=2:h=14:color=0xa4dcff@0.85:t=fill,
+drawbox=x='mod(370+95*t,1080)':y='mod(430+600*t,1920)':w=4:h=24:color=white@0.90:t=fill,
+drawbox=x='mod(810-80*t,1080)':y='mod(640+470*t,1920)':w=2:h=17:color=0xffdc83@0.85:t=fill,
+drawbox=x='mod(230+65*t,1080)':y='mod(900+540*t,1920)':w=3:h=20:color=white@0.88:t=fill,
+drawbox=x='mod(1020-100*t,1080)':y='mod(1110+650*t,1920)':w=4:h=26:color=0x8fd5ff@0.90:t=fill,
+drawbox=x='mod(560+85*t,1080)':y='mod(1320+490*t,1920)':w=2:h=16:color=white@0.86:t=fill,
+drawbox=x='mod(70+110*t,1080)':y='mod(1510+590*t,1920)':w=3:h=22:color=0xffdc83@0.82:t=fill,
+drawbox=x='mod(720-60*t,1080)':y='mod(1720+450*t,1920)':w=2:h=15:color=white@0.88:t=fill,
+drawbox=x='mod(440+105*t,1080)':y='mod(180+700*t,1920)':w=3:h=28:color=0xa4dcff@0.88:t=fill,
+drawbox=x='mod(900-72*t,1080)':y='mod(780+560*t,1920)':w=2:h=18:color=white@0.84:t=fill,
+drawbox=x='mod(310+90*t,1080)':y='mod(1240+620*t,1920)':w=4:h=24:color=white@0.90:t=fill[bg];
+[fg_src]scale=1000:820:force_original_aspect_ratio=decrease,pad=iw+14:ih+14:7:7:color=0x70cfff,setsar=1[fg];
+[bg][fg]overlay=x=(W-w)/2:y=(H-h)/2:format=auto[base]
+FILTER
+)
+        ;;
+
+    plasma)
+        BASE_FILTER=$(cat <<'FILTER'
+[0:v]split=2[dim_src][fg_src];
+nullsrc=size=1080x1920:rate=50,format=rgb24,
+geq=r='128+105*sin(X/68+T*1.9)+22*sin(Y/91-T*1.1)':g='128+96*sin(Y/75+T*1.5)+26*sin((X+Y)/120+T*1.3)':b='128+110*sin((X-Y)/82-T*1.7)',
+gblur=sigma=18,eq=brightness=-0.16:saturation=1.22[plasma];
+[dim_src]scale=1080:1920:force_original_aspect_ratio=increase,crop=1080:1920,gblur=sigma=26,eq=brightness=-0.70:saturation=0.35,setsar=1[dim];
+[plasma][dim]blend=all_mode=overlay:all_opacity=0.35[bg];
+[fg_src]scale=1000:820:force_original_aspect_ratio=decrease,pad=iw+16:ih+16:8:8:color=0xffffff,setsar=1[fg];
+[bg][fg]overlay=x=(W-w)/2:y=(H-h)/2:format=auto[base]
+FILTER
+)
+        ;;
+
+    rasterbars)
+        BASE_FILTER=$(cat <<'FILTER'
+[0:v]split=2[bg_src][fg_src];
+[bg_src]scale=1080:1920:force_original_aspect_ratio=increase,crop=1080:1920,gblur=sigma=30,eq=brightness=-0.70:saturation=0.35,setsar=1,
+drawbox=x=0:y=0:w=1080:h=1920:color=0x05061b@0.80:t=fill,
+drawbox=x=0:y='250+90*sin(t*1.25)':w=1080:h=30:color=0xff3b7f@0.78:t=fill,
+drawbox=x=0:y='300+90*sin(t*1.25)':w=1080:h=24:color=0xff7b32@0.72:t=fill,
+drawbox=x=0:y='345+90*sin(t*1.25)':w=1080:h=18:color=0xffd12b@0.66:t=fill,
+drawbox=x=0:y='1510+85*sin(t*1.10+1.2)':w=1080:h=18:color=0x55e6ff@0.68:t=fill,
+drawbox=x=0:y='1550+85*sin(t*1.10+1.2)':w=1080:h=24:color=0x4b8cff@0.72:t=fill,
+drawbox=x=0:y='1600+85*sin(t*1.10+1.2)':w=1080:h=30:color=0x8b55ff@0.76:t=fill[bg];
+[fg_src]scale=1000:820:force_original_aspect_ratio=decrease,pad=iw+14:ih+14:7:7:color=0xffffff,setsar=1[fg];
+[bg][fg]overlay=x=(W-w)/2:y=(H-h)/2:format=auto[base]
+FILTER
+)
+        ;;
+
+    vhs)
+        BASE_FILTER=$(cat <<'FILTER'
+[0:v]split=2[bg_src][fg_src];
+[bg_src]scale=1080:1920:force_original_aspect_ratio=increase,crop=1080:1920,gblur=sigma=26,eq=brightness=-0.44:saturation=0.55,noise=alls=10:allf=t+u,setsar=1[bg];
+[fg_src]scale=1000:820:force_original_aspect_ratio=decrease,chromashift=cbh=2:crh=-2,noise=alls=5:allf=t+u,eq=contrast=1.08:saturation=0.92,vignette=angle=PI/4.5,setsar=1,
+drawgrid=width=iw:height=5:thickness=1:color=black@0.13[fg];
+[bg][fg]overlay=x=(W-w)/2:y=(H-h)/2:format=auto,
+drawbox=x=0:y='300+mod(t*510,1320)':w=1080:h=10:color=white@0.08:t=fill,
+drawbox=x=0:y='420+mod(t*320,1080)':w=1080:h=3:color=0x7bd7ff@0.10:t=fill[base]
+FILTER
+)
+        ;;
+
+    monitor)
+        BASE_FILTER=$(cat <<'FILTER'
+[0:v]split=2[bg_src][screen_src];
+[bg_src]scale=1080:1920:force_original_aspect_ratio=increase,crop=1080:1920,gblur=sigma=34,eq=brightness=-0.68:saturation=0.32,setsar=1,
+drawbox=x=0:y=0:w=1080:h=1920:color=0x11131a@0.78:t=fill,
+drawbox=x=42:y=365:w=996:h=1000:color=0xaaa69a:t=fill,
+drawbox=x=68:y=392:w=944:h=944:color=0x2a2926:t=fill,
+drawbox=x=105:y=438:w=870:h=790:color=0x050505:t=fill,
+drawbox=x=792:y=1260:w=44:h=18:color=0x6aff73:t=fill,
+drawbox=x=852:y=1253:w=30:h=30:color=0x232323:t=fill,
+drawbox=x=910:y=1253:w=30:h=30:color=0x232323:t=fill,
+drawbox=x=380:y=1365:w=320:h=75:color=0x8f8b80:t=fill,
+drawbox=x=290:y=1438:w=500:h=36:color=0x77736b:t=fill[monitor];
+[screen_src]scale=840:750:force_original_aspect_ratio=decrease,lenscorrection=k1=-0.045:k2=0.012,vignette=angle=PI/5,eq=contrast=1.06:saturation=1.06,setsar=1[screen];
+[monitor][screen]overlay=x=(W-w)/2:y=458:format=auto[base]
+FILTER
+)
+        ;;
+
+    split)
+        BASE_FILTER=$(cat <<'FILTER'
+[0:v]split=4[bg_src][main_src][top_src][bottom_src];
+[bg_src]scale=1080:1920:force_original_aspect_ratio=increase,crop=1080:1920,gblur=sigma=34,eq=brightness=-0.55:saturation=0.55,setsar=1[bg];
+[top_src]scale=1080:520:force_original_aspect_ratio=increase,crop=1080:360:y='(ih-360)/2',eq=brightness=-0.28:saturation=0.88,gblur=sigma=2,setsar=1[top];
+[bottom_src]scale=1080:520:force_original_aspect_ratio=increase,crop=1080:360:y='(ih-360)/2',hflip,eq=brightness=-0.32:saturation=0.80,gblur=sigma=2,setsar=1[bottom];
+[main_src]scale=1000:820:force_original_aspect_ratio=decrease,pad=iw+14:ih+14:7:7:color=0xffffff,setsar=1[main];
+[bg][top]overlay=x=0:y=275[tmp1];
+[tmp1][bottom]overlay=x=0:y=1285[tmp2];
+[tmp2][main]overlay=x=(W-w)/2:y=(H-h)/2:format=auto[base]
+FILTER
+)
+        ;;
+
+    spectrum)
+        BASE_FILTER=$(cat <<'FILTER'
+[0:v]split=2[bg_src][fg_src];
+[bg_src]scale=1080:1920:force_original_aspect_ratio=increase,crop=1080:1920,gblur=sigma=30,eq=brightness=-0.62:saturation=0.40,setsar=1,
+drawbox=x=0:y=0:w=1080:h=1920:color=0x040717@0.68:t=fill[bg];
+[fg_src]scale=1000:780:force_original_aspect_ratio=decrease,pad=iw+12:ih+12:6:6:color=0x55c8ff,setsar=1[fg];
+[0:a]aformat=sample_fmts=fltp:channel_layouts=stereo,showspectrum=s=1000x250:mode=combined:color=rainbow:scale=sqrt:fscale=log:slide=scroll:win_func=hann:fps=50:opacity=0.85,format=rgba[spec];
+[bg][spec]overlay=x=(W-w)/2:y=1360:format=auto[tmp];
+[tmp][fg]overlay=x=(W-w)/2:y=480:format=auto[base]
+FILTER
+)
+        ;;
+
+    video)
+        VIDEO_BLUR_FILTER=""
+        if awk -v v="$VIDEO_BLUR" 'BEGIN { exit !(v > 0) }'; then
+            VIDEO_BLUR_FILTER=",gblur=sigma=${VIDEO_BLUR}"
+        fi
+
+        BASE_FILTER=$(cat <<FILTER
+color=c=black:s=1080x1920:r=50[black];
+[1:v]scale=1080:1920:force_original_aspect_ratio=increase,crop=1080:1920,setsar=1${VIDEO_BLUR_FILTER},format=rgba,colorchannelmixer=aa=${VIDEO_OPACITY}[bgvideo];
+[black][bgvideo]overlay=x=0:y=0:format=auto[bg];
+[0:v]${SOURCE_CROP_FILTER},${SOURCE_SCALE_FILTER},setsar=1[fg];
+[bg][fg]overlay=x=(W-w)/2:y=(H-h)/2:format=auto[base]
+FILTER
+)
+        ;;
+
+esac
+
+SOURCE_FADE_PREFIX=""
+if awk -v v="$SOURCE_FADE_IN" 'BEGIN { exit !(v > 0) }'; then
+    # Fade only the Amiga source stream. Background video/image stays fully
+    # visible from frame 0; the source overlay (and source-derived layers)
+    # ramp from transparent to opaque.
+    SOURCE_FADE_PREFIX="[0:v]format=rgba,fade=t=in:st=0:d=${SOURCE_FADE_IN}:alpha=1[srcfade];"
+    BASE_FILTER="${BASE_FILTER//\[0:v]/[srcfade]}"
+fi
+
+FILTER_COMPLEX=$(cat <<FILTER
+${SOURCE_FADE_PREFIX}${BASE_FILTER};
+[base]
+drawbox=x=0:y=0:w=1080:h=245:color=black@0.50:t=fill:enable='between(t,0,${HOOK_END})',
+drawtext=fontfile='${FONT_ESC}':textfile='${HOOK_ESC}':fontcolor=white:fontsize=70:line_spacing=10:x=(w-text_w)/2:y=70:fix_bounds=true:shadowcolor=black@0.75:shadowx=4:shadowy=4:enable='between(t,0,${HOOK_END})',
+drawbox=x=0:y=1490:w=1080:h=430:color=black@0.62:t=fill:enable='gte(t,${INFO_START})',
+drawtext=fontfile='${FONT_ESC}':textfile='${TITLE_ESC}':fontcolor=white:fontsize=62:line_spacing=8:x=(w-text_w)/2:y=1560:fix_bounds=true:shadowcolor=black@0.80:shadowx=4:shadowy=4:enable='gte(t,${INFO_START})',
+drawtext=fontfile='${FONT_ESC}':textfile='${META_ESC}':fontcolor=white@0.92:fontsize=42:x=(w-text_w)/2:y=1655:fix_bounds=true:shadowcolor=black@0.80:shadowx=3:shadowy=3:enable='gte(t,${INFO_START})',
+drawtext=fontfile='${FONT_ESC}':textfile='${WEBSITE_ESC}':fontcolor=0x55c8ff:fontsize=52:x=(w-text_w)/2:y=1780:fix_bounds=true:shadowcolor=black@0.85:shadowx=4:shadowy=4:enable='gte(t,${CTA_START})',
+fps=50,format=yuv420p[vout]
+FILTER
+)
+
+printf 'Creating AmigaDB YouTube Short...\n'
+printf '  Input:    %s\n' "$INPUT"
+printf '  Segment:  %s + %ss\n' "$START" "$DURATION"
+printf '  Style:    %s\n' "$STYLE"
+printf '  Src fade: %ss\n' "$SOURCE_FADE_IN"
+printf '  Output:   %s\n' "$OUTPUT"
+printf '  Font:     %s\n' "$FONT_FILE"
+if [[ "$STYLE" == "brand" ]]; then
+    printf '  Bg image: %s\n' "$BACKGROUND_IMAGE"
+fi
+if [[ "$STYLE" == "video" ]]; then
+    printf '  Bg video: %s\n' "$BACKGROUND_VIDEO"
+    printf '  Bg blur:  %s\n' "$VIDEO_BLUR"
+    printf '  Bg alpha: %s\n' "$VIDEO_OPACITY"
+    printf '  Src crop: %s\n' "$SOURCE_CROP_SPEC"
+    printf '  Src margin:%s px each side (target width %s)\n' "$SOURCE_MARGIN_X" "$SOURCE_TARGET_WIDTH"
+fi
+
+FFMPEG_ARGS=(
+    -hide_banner -y
+    -ss "$START"
+    -t "$DURATION"
+    -i "$INPUT"
+)
+
+if [[ "$STYLE" == "brand" ]]; then
+    FFMPEG_ARGS+=( -loop 1 -i "$BACKGROUND_IMAGE" )
+fi
+
+if [[ "$STYLE" == "video" ]]; then
+    FFMPEG_ARGS+=( -stream_loop -1 -i "$BACKGROUND_VIDEO" )
+fi
+
+FFMPEG_ARGS+=(
+    -filter_complex "$FILTER_COMPLEX"
+    -map "[vout]"
+    -map 0:a?
+    -c:v libx264
+    -preset "$PRESET"
+    -crf "$CRF"
+    -profile:v high
+    -level:v 4.2
+    -pix_fmt yuv420p
+    -c:a aac
+    -b:a 320k
+    -ar 48000
+    -movflags +faststart
+    -t "$DURATION"
+    -shortest
+    "$OUTPUT"
+)
+
+ffmpeg "${FFMPEG_ARGS[@]}"
+
+printf '\nDone: %s\n' "$OUTPUT"