Speed up ffmpeg commands

Mårten Åsberg committed on 2026-05-09 at 17:24

By seeking on input instead of output.

Should have done that from the start!

Browse files at this commit

src/Infrastructure/Ffmpeg/ClipExtractor.cs +2 -6

diff --git a/src/Infrastructure/Ffmpeg/ClipExtractor.cs b/src/Infrastructure/Ffmpeg/ClipExtractor.cs
index 93400ce..d587da8 100644
@@ -37,13 +37,11 @@ internal sealed partial class ClipExtractor(ILogger<ClipExtractor> logger) : ICl
    {
        var crops = new Dictionary<Rectangle, int>();
        var args = FFMpegArguments
            .FromFileInput(media.Path)
            .FromFileInput(media.Path, addArguments: options => options.Seek(start).EndSeek(start + duration))
            .OutputToFile(
                "-",
                addArguments: options =>
                    options
                        .Seek(start)
                        .EndSeek(start + duration)
                        .WithVideoFilters(filter =>
                            filter
                                .Add("zscale", "t=linear:npl=100")
@@ -88,13 +86,11 @@ internal sealed partial class ClipExtractor(ILogger<ClipExtractor> logger) : ICl
    {
        var subtitleOptions = await CreateSubtitleOptions(media, cancellationToken);
        var args = FFMpegArguments
            .FromFileInput(media.Path)
            .FromFileInput(media.Path, addArguments: options => options.Seek(start).EndSeek(start + duration))
            .OutputToFile(
                outputPath,
                addArguments: options =>
                    options
                        .Seek(start)
                        .EndSeek(start + duration)
                        .WithVideoFilters(filter =>
                        {
                            if (crop is { Width: var width, Height: var height, X: var x, Y: var y })