[FFmpeg-cvslog] fftools/ffmpeg: when framerate is set, prefer its inverse as output timebase
Anton Khirnov
git at videolan.org
Thu Apr 8 12:04:28 EEST 2021
ffmpeg | branch: master | Anton Khirnov <anton at khirnov.net> | Mon Apr 5 10:44:36 2021 +0200| [0214da22cae08615f58f9769a4e8fb47d21aa687] | committer: Anton Khirnov
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.
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=0214da22cae08615f58f9769a4e8fb47d21aa687
---
fftools/ffmpeg.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/fftools/ffmpeg.c b/fftools/ffmpeg.c
index 46bb014de8..8e6206647f 100644
--- a/fftools/ffmpeg.c
+++ b/fftools/ffmpeg.c
@@ -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)
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