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Remove padding segment at the start

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This commit is contained in:
Zoe Roux 2024-02-24 15:04:40 +00:00
parent 9531795066
commit f5c629cb8a
1 changed files with 13 additions and 16 deletions
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29
transcoder/src/stream.go
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@ -138,21 +138,21 @@ 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_padding := int32(0)
if start == 0 {
start_padding = 1
} else {
// the param for the -ss. This takes the keyframe before the specificed time
if start != 0 {
// 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 before the keyframe that interest us
// and the first segment will contains the extra we do not want.
start_ref = (ts.file.Keyframes[start-1] + ts.file.Keyframes[start]) / 2
// 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
} else {
start_ref = (ts.file.Keyframes[start] + ts.file.Keyframes[start+1]) / 2
}
}
end_padding := int32(1)
if end == int32(len(ts.file.Keyframes)) {
end_padding = 0
}
segments := ts.file.Keyframes[start+start_padding : end+end_padding]
segments := ts.file.Keyframes[start+1 : end+end_padding]
if len(segments) == 0 {
// we can't leave that empty else ffmpeg errors out.
segments = []float64{9999999}
@ -189,13 +189,10 @@ func (ts *Stream) run(start int32) error {
// sometimes, the duration is shorter than expected (only during transcode it seems)
// always include more and use the -f segment to split the file where we want
end_ref := ts.file.Keyframes[end+1]
if start_ref != 0 {
// 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-1]
}
// 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]
args = append(args,
"-to", fmt.Sprintf("%.6f", end_ref),
)