[FFmpeg-devel] [PATCH] avformat/movenc: fixed fmp4 packets containing incorrect flags after transcoding

[Steven Liu]

Steven Liu <lingjiujianke at gmail.com> 于2023年4月23日周日 09:54写道：
>
> <1035567130 at qq.com> 于2023年4月10日周一 20:43写道：
> >
> > From: Wang Yaqiang <wangyaqiang03 at kuaishou.com>
> >
> > 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 at kuaishou.com>
> > ---
> >  libavformat/movenc.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/libavformat/movenc.c b/libavformat/movenc.c
> > index c370922c7d..946e79c5ac 100644
> > --- a/libavformat/movenc.c
> > +++ b/libavformat/movenc.c
> > @@ -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;
> > --
> > 2.39.2
> >
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>
>
> Test ok here.

Applied.

Thanks
Steven