Some fixes

Services/RenderPipeline.cs

@@ -15,7 +15,7 @@ public sealed class RenderPipeline
         _probe = new MediaProbe(_runner, null);
     }
 
-    public async Task RenderAsync(
+    public async Task<IReadOnlyList<string>> RenderAsync(
         RenderSettings settings,
         IProgress<RenderProgress> progress,
         Action<string> log,
@@ -105,7 +105,16 @@ public sealed class RenderPipeline
             finalArgs.AddRange(EncoderArguments(encoder));
             finalArgs.AddRange(["-c:a", "aac", "-b:a", "384k", "-ar", "48000", "-movflags", "+faststart", final]);
             await RunStageAsync(tools.Ffmpeg, finalArgs, log, progress, "Final render", 60, 99, finalDuration, settings.FramesPerSecond, token);
+
+            IReadOnlyList<string> inputPaths = settings.InputFiles;
+            if (settings.MoveSourcesToOriginals)
+            {
+                progress.Report(new(99.5, "Moving sources", "Moving original recordings to originals"));
+                inputPaths = MoveSourceVideos(settings.InputFiles, settings.OutputDirectory, log);
+            }
+
             progress.Report(new(100, "Complete", final));
+            return inputPaths;
         }
         finally
         {
@@ -285,6 +294,70 @@ public sealed class RenderPipeline
         return fallbackPath;
     }
 
+    internal static IReadOnlyList<string> MoveSourceVideos(
+        IReadOnlyList<string> sources,
+        string outputDirectory,
+        Action<string> log)
+    {
+        string originalsDir = Path.Combine(outputDirectory, "originals");
+        Directory.CreateDirectory(originalsDir);
+        List<string> resolved = new(sources.Count);
+        HashSet<string> claimed = new(StringComparer.OrdinalIgnoreCase);
+
+        foreach (string source in sources)
+        {
+            if (!File.Exists(source))
+            {
+                log($"WARNING: Source file no longer exists, skipped move: {source}");
+                resolved.Add(source);
+                continue;
+            }
+
+            string sourceFull = Path.GetFullPath(source);
+            string preferred = Path.GetFullPath(Path.Combine(originalsDir, Path.GetFileName(source)));
+            if (string.Equals(sourceFull, preferred, StringComparison.OrdinalIgnoreCase))
+            {
+                claimed.Add(preferred);
+                resolved.Add(preferred);
+                continue;
+            }
+
+            string dest = UniqueDestination(preferred, claimed);
+
+            try
+            {
+                File.Move(source, dest);
+                claimed.Add(dest);
+                log($"Moved source to {dest}");
+                resolved.Add(dest);
+            }
+            catch (Exception exception)
+            {
+                log($"WARNING: Could not move source '{source}' to originals: {exception.Message}");
+                resolved.Add(source);
+            }
+        }
+
+        return resolved;
+    }
+
+    private static string UniqueDestination(string dest, HashSet<string> claimed)
+    {
+        string full = Path.GetFullPath(dest);
+        if (!File.Exists(full) && !claimed.Contains(full))
+            return full;
+
+        string directory = Path.GetDirectoryName(full)!;
+        string name = Path.GetFileNameWithoutExtension(full);
+        string extension = Path.GetExtension(full);
+        for (int index = 2; ; index++)
+        {
+            string candidate = Path.Combine(directory, $"{name}_{index}{extension}");
+            if (!File.Exists(candidate) && !claimed.Contains(candidate))
+                return candidate;
+        }
+    }
+
     private static void Validate(RenderSettings s)
     {
         if (s.InputFiles.Count == 0) throw new ArgumentException("Select at least one AVI input file.");