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Workaround ffmpeg keyframe seeking for external subtitles

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We seek to the exact position of the keyframe for direct stream/remuxing, but FFmpeg seeks to the previous keyframe when the exact time is provided as input. To work around this, add a 0.5 second offset to the seeking time.

Signed-off-by: gnattu <gnattuoc@me.com>
This commit is contained in:
gnattu 2024-05-17 12:12:45 +08:00
parent 26714e2c62
commit dec2032e13
1 changed files with 7 additions and 1 deletions
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8
MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs
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@ -2771,7 +2771,13 @@ namespace MediaBrowser.Controller.MediaEncoding
if (time > 0)
{
seekParam += string.Format(CultureInfo.InvariantCulture, "-ss {0}", _mediaEncoder.GetTimeParameter(time));
// For direct streaming/remuxing, we seek at the exact position of the keyframe
// However, ffmpeg will seek to previous keyframe when the exact time is the input
// Workaround this by adding 0.5s offset to the seeking time to get the exact keyframe on most videos.
// This will help subtitle syncing.
var isHlsRemuxing = state.IsVideoRequest && state.TranscodingType is TranscodingJobType.Hls && IsCopyCodec(state.OutputVideoCodec);
var seekTick = isHlsRemuxing ? time + 5000000L : time;
seekParam += string.Format(CultureInfo.InvariantCulture, "-ss {0}", _mediaEncoder.GetTimeParameter(seekTick));
if (state.IsVideoRequest)
{