[FFmpeg-devel] [PATCH v2] fftools/ffmpeg_dec: Don't keep sending frame to filters in flushing

[Paul B Mahol]

On Mon, Jun 26, 2023 at 6:08 PM Anton Khirnov <anton at khirnov.net> wrote:

> Quoting Fei Wang (2023-06-26 09:24:58)
> > Filter may has a limited frame pool size. Do not always send frame to
> > filters without reaping.
> >
> > Fix the regression of commit 5fa00b38e6.
> >
> > Example cmd:
> > $ ffmpeg -threads 20 -init_hw_device vaapi=hw:/dev/dri/renderD128   \
> > -hwaccel_output_format vaapi -hwaccel vaapi -i avc_1080P.mp4        \
> > -vf 'scale_vaapi=w=720:h=480' -f null -
> >
> > Signed-off-by: Fei Wang <fei.w.wang at intel.com>
> > ---
> > Change:
> > 1. rebase to master.
> >
> >  fftools/ffmpeg_dec.c | 6 ++++++
> >  1 file changed, 6 insertions(+)
> >
> > diff --git a/fftools/ffmpeg_dec.c b/fftools/ffmpeg_dec.c
> > index 85bf8dc536..a7ae51fed2 100644
> > --- a/fftools/ffmpeg_dec.c
> > +++ b/fftools/ffmpeg_dec.c
> > @@ -803,6 +803,12 @@ int dec_packet(InputStream *ist, const AVPacket
> *pkt, int no_eof)
> >          av_frame_unref(d->frame);
> >          if (ret < 0)
> >              goto finish;
> > +
> > +        // During flushing, break out to reap filter once send a frame
> to filters to
> > +        // avoid drain out filter's output frame pool. Especially for
> HW filters which
> > +        // always have a limited frame pool size.
> > +        if (!pkt)
> > +            return 0;
>
> This is wrong and will leave the decoder in an inconsistent state.
>

Two wrongs do not make things right.


>
> --
> Anton Khirnov
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