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Fix segments and keyframe params (segments need relative to 0, keyframes relative to original ts with -copyts)

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This commit is contained in:
Zoe Roux 2024-02-12 17:37:30 +01:00
parent edc1619962
commit 394fe4871f
1 changed files with 14 additions and 7 deletions
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21
transcoder/src/stream.go
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@ -95,6 +95,12 @@ func (ts *Stream) isSegmentTranscoding(segment int32) bool {
return false
}
func toSegmentStr(segments []float64) string {
return strings.Join(Map(segments, func(seg float64, _ int) string {
return fmt.Sprintf("%.6f", seg)
}), ",")
}
func (ts *Stream) run(start int32) error {
// Start the transcode up to the 100th segment (or less)
// Stop at the first finished segment
@ -145,13 +151,9 @@ func (ts *Stream) run(start int32) error {
end_padding = 0
}
segments := ts.file.Keyframes[start+start_padding : end+end_padding]
segments_str := strings.Join(Map(segments, func(seg float64, _ int) string {
seg = seg - start_ref
return fmt.Sprintf("%.6f", seg)
}), ",")
if segments_str == "" {
if len(segments) == 0 {
// we can't leave that empty else ffmpeg errors out.
segments_str = "99999999"
segments = []float64{9999999}
}
outpath := ts.handle.getOutPath(encoder_id)
@ -196,9 +198,14 @@ func (ts *Stream) run(start int32) error {
args = append(args, ts.handle.getTranscodeArgs(toSegmentStr(segments))...)
args = append(args,
"-f", "segment",
// needed for rounding issues when forcing keyframes
"-segment_time_delta", "0.2",
"-segment_format", "mpegts",
"-segment_times", segments_str,
"-segment_times", toSegmentStr(Map(segments, func(seg float64, _ int) float64 {
// for a strange reason, -segment-times does not respects -copyts so we must
// remove the start_ref (-ss param)
return seg - start_ref
})),
"-segment_list_type", "flat",
"-segment_list", "pipe:1",
)