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Use padding segment for audio since it give better results

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This commit is contained in:
Zoe Roux 2024-02-24 16:04:22 +00:00
parent 1c71258984
commit de3013eebf
1 changed files with 11 additions and 5 deletions
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16
transcoder/src/stream.go
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@ -138,14 +138,20 @@ func (ts *Stream) run(start int32) error {
// Having an extra segment allows us to cut precisely the segments we want with the
// -f segment that does cut the begining and the end at the keyframe like asked
start_ref := float64(0)
start_segment := start
if start != 0 {
if ts.handle.getFlags()&AudioF != 0 {
// when segmenting audio, we need -ss to have the context before the start time
// without it, the cut loses a bit of audio (audio gap of ~100ms)
start_segment = start - 1
}
// the param for the -ss takes the keyframe before the specificed time
// (if the specified time is a keyframe, it either takes that keyframe or the one before)
// to prevent this weird behavior, we specify a bit after the keyframe that interest us
if start+1 == int32(len(ts.file.Keyframes)) {
start_ref = (ts.file.Keyframes[start] + float64(ts.file.Info.Duration)) / 2
if start_segment+1 == int32(len(ts.file.Keyframes)) {
start_ref = (ts.file.Keyframes[start_segment] + float64(ts.file.Info.Duration)) / 2
} else {
start_ref = (ts.file.Keyframes[start] + ts.file.Keyframes[start+1]) / 2
start_ref = (ts.file.Keyframes[start_segment] + ts.file.Keyframes[start_segment+1]) / 2
}
}
end_padding := int32(1)
@ -192,7 +198,7 @@ func (ts *Stream) run(start int32) error {
// it seems that the -to is confused when -ss seek before the given time (because it searches for a keyframe)
// add back the time that would be lost otherwise
// this only appens when -to is before -i but having -to after -i gave a bug (not sure, don't remember)
end_ref += start_ref - ts.file.Keyframes[start]
end_ref += start_ref - ts.file.Keyframes[start_segment]
args = append(args,
"-to", fmt.Sprintf("%.6f", end_ref),
)
@ -221,7 +227,7 @@ func (ts *Stream) run(start int32) error {
// segment_times want durations, not timestamps so we must substract the -ss param
// since we give a greater value to -ss to prevent wrong seeks but -segment_times
// needs precise segments, we use the keyframe we want to seek to as a reference.
return seg - ts.file.Keyframes[start]
return seg - ts.file.Keyframes[start_segment]
})),
"-segment_list_type", "flat",
"-segment_list", "pipe:1",