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avformat/movenc: fixed fmp4 packets containing incorrect flags after transcoding

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When write multi-trun box, the MOV_TRUN_FIRST_SAMPLE_FLAGS flag
need judge by first param, not 0.
If the original video contains consecutive I frames,
this will cause the packets of fmp4 have error sample_flags ,
and then incorrect keyframes were generated,
and then error packet will be seeked.

Signed-off-by: Wang Yaqiang <wangyaqiang03@kuaishou.com>
Signed-off-by: Steven Liu <liuqi05@chinaffmpeg.org>
This commit is contained in:
Wang Yaqiang 2023-04-10 20:43:26 +08:00 committed by Steven Liu
parent 9a258eefae
commit 734a61d282
1 changed files with 2 additions and 2 deletions
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4
libavformat/movenc.c
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@ -4858,8 +4858,8 @@ static int mov_write_trun_tag(AVIOContext *pb, MOVMuxContext *mov,
if (i > first && get_sample_flags(track, &track->cluster[i]) != track->default_sample_flags)
flags |= MOV_TRUN_SAMPLE_FLAGS;
}
if (!(flags & MOV_TRUN_SAMPLE_FLAGS) && track->entry > 0 &&
get_sample_flags(track, &track->cluster[0]) != track->default_sample_flags)
if (!(flags & MOV_TRUN_SAMPLE_FLAGS) && track->entry > first &&
get_sample_flags(track, &track->cluster[first]) != track->default_sample_flags)
flags |= MOV_TRUN_FIRST_SAMPLE_FLAGS;
if (track->flags & MOV_TRACK_CTTS)
flags |= MOV_TRUN_SAMPLE_CTS;