static string BuildCommandLine(VideoSegment segment)
{
var sb = new StringBuilder();
sb.Append(" -hide_banner");
sb.Append($" -ss {segment.CutFrom}");
sb.Append($" -i \"{segment.SourceFile}\"");
sb.Append($" -t {segment.CutDuration}");
sb.Append(" -avoid_negative_ts make_zero");
if (Settings.Instance.RemoveAudio)
{
sb.Append($" -an {segment.CutFrom}");
}
else
{
sb.Append(" -acodec copy");
}
sb.Append(" -vcodec copy");
sb.Append(" -scodec copy");
if (!Settings.Instance.IncludeAllStreams)
{
sb.Append(" -map 0");
}
sb.Append(" -map_metadata 0");
sb.Append(" -ignore_unknown");
sb.Append($" -y \"{segment.OutputFile}\"");
return(sb.ToString());
}
public async Task Cut(VideoSegment segment)
{
var commandLine = BuildCommandLine(segment);
using var ffmpegProcess = new Process
{
StartInfo = new ProcessStartInfo
{
Arguments = commandLine,
FileName = FfmpegStatics.FfmpegPath,
CreateNoWindow = true,
RedirectStandardInput = true,
RedirectStandardOutput = true,
RedirectStandardError = true,
UseShellExecute = false,
WindowStyle = ProcessWindowStyle.Hidden
}
};
ffmpegProcess.ErrorDataReceived += (sender, e) =>
{
if (e.Data == null)
{
return;
}
var c = FfmpegStatics.ProgressRegex.Matches(e.Data);
if (c.Count == 0 || c[0].Groups.Count < 2)
{
return;
}
if (!TimeSpan.TryParse(c[0].Groups[1].Value, out TimeSpan progress))
{
return;
}
Progress?.Invoke(new ProgressEventArgs(progress / segment.CutDuration));
};
await ffmpegProcess.WaitForExitAsync(null);
if (ffmpegProcess.ExitCode != 0)
{
throw new Exception("Failed to cut. Uncheck 'Include all streams' and try again. Otherwise run ffmpeg yourself and see what reports to you");
}
}