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fftools/ffmpeg: when framerate is set, prefer its inverse as output timebase 

Codec timebase is not well-defined for streamcopy, so it should only be
used as the last resort.
This commit is contained in:
Anton Khirnov 2021-04-05 10:44:36 +02:00
parent 7ec8229982
commit 0214da22ca
1 changed files with 6 additions and 2 deletions
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8
fftools/ffmpeg.c
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@ -3151,8 +3151,12 @@ static int init_output_stream_streamcopy(OutputStream *ost)
return ret;
// copy timebase while removing common factors
if (ost->st->time_base.num <= 0 || ost->st->time_base.den <= 0)
ost->st->time_base = av_add_q(av_stream_get_codec_timebase(ost->st), (AVRational){0, 1});
if (ost->st->time_base.num <= 0 || ost->st->time_base.den <= 0) {
if (ost->frame_rate.num)
ost->st->time_base = av_inv_q(ost->frame_rate);
else
ost->st->time_base = av_add_q(av_stream_get_codec_timebase(ost->st), (AVRational){0, 1});
}
// copy estimated duration as a hint to the muxer
if (ost->st->duration <= 0 && ist->st->duration > 0)