Working version

Services/ToolExtractor.cs

@@ -22,6 +22,18 @@ public static class ToolExtractor
         return await ExtractAsync(cancellationToken);
     }
 
+    public static bool TryResolveFromSystemPath(out ToolPaths? tools)
+    {
+        tools = null;
+        string? ffmpeg = FindOnPath("ffmpeg.exe");
+        string? ffprobe = FindOnPath("ffprobe.exe");
+        if (ffmpeg is null || ffprobe is null)
+            return false;
+
+        tools = new ToolPaths(ffmpeg, ffprobe);
+        return true;
+    }
+
     private static async Task<ToolPaths> ExtractAsync(CancellationToken cancellationToken = default)
     {
         string toolDir = Path.Combine(
@@ -66,4 +78,26 @@ public static class ToolExtractor
         byte[] bHash = sha.ComputeHash(b);
         return aHash.AsSpan().SequenceEqual(bHash);
     }
+
+    private static string? FindOnPath(string fileName)
+    {
+        string? path = Environment.GetEnvironmentVariable("PATH");
+        if (string.IsNullOrWhiteSpace(path))
+            return null;
+
+        foreach (string directory in path.Split(Path.PathSeparator, StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries))
+        {
+            try
+            {
+                string candidate = Path.Combine(directory, fileName);
+                if (File.Exists(candidate))
+                    return candidate;
+            }
+            catch
+            {
+            }
+        }
+
+        return null;
+    }
 }