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fftools/ffmpeg: Restore DTS correction for VP9 copies 

Fixes ticket 9086.

Since early 2021, some of YouTube's VP9 encodes have non-monotonous DTS.
This makes ffmpeg fatally fail when trying to copy or encode the V9 video.

ffmpeg already includes functionality to correct this, however it was
disabled without explanation for VP9 stream copies in
2e6636aa87

This patch restores the DTS correction logic, and allows ffmpeg to correctly
encode (invalid) videos produced by youtube.com. I have verified that frames
are NOT being cut (so it does not re-introduce 4313).

Reviwed-by: Ronald S. Bultje <rsbultje@gmail.com>
Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
Danny Wu 2021-05-12 08:51:13 -04:00 committed by James Almer
parent 2233ef1db9
commit 68595b46cb
1 changed files with 0 additions and 1 deletions
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fftools/ffmpeg.c
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@ -812,7 +812,6 @@ static void write_packet(OutputFile *of, AVPacket *pkt, OutputStream *ost, int u
}
if ((st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO || st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO || st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE) &&
pkt->dts != AV_NOPTS_VALUE &&
!(st->codecpar->codec_id == AV_CODEC_ID_VP9 && ost->stream_copy) &&
ost->last_mux_dts != AV_NOPTS_VALUE) {
int64_t max = ost->last_mux_dts + !(s->oformat->flags & AVFMT_TS_NONSTRICT);
if (pkt->dts < max) {