[FFmpeg-devel] [FFmpeg-cvslog] avfilter/vf_tpad: if there is no frame to clone return early

[Paul B Mahol]

On Thu, Feb 24, 2022 at 10:12 PM Thierry Foucu <tfoucu at gmail.com> wrote:

> On Thu, Feb 24, 2022 at 12:30 PM Paul B Mahol <git at videolan.org> wrote:
>
> > ffmpeg | branch: master | Paul B Mahol <onemda at gmail.com> | Thu Feb 24
> > 20:32:41 2022 +0100| [3715f2f8643695940582ce040b7a052cccfb9db2] |
> > committer: Paul B Mahol
> >
> > avfilter/vf_tpad: if there is no frame to clone return early
> >
> > >
> >
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=3715f2f8643695940582ce040b7a052cccfb9db2
> > ---
> >
> >  libavfilter/vf_tpad.c | 5 +++++
> >  1 file changed, 5 insertions(+)
> >
> > diff --git a/libavfilter/vf_tpad.c b/libavfilter/vf_tpad.c
> > index e5acece1e4..120dbcb4d3 100644
> > --- a/libavfilter/vf_tpad.c
> > +++ b/libavfilter/vf_tpad.c
> > @@ -148,6 +148,11 @@ static int activate(AVFilterContext *ctx)
> >                                frame->data, frame->linesize,
> >                                0, 0, frame->width, frame->height);
> >          } else if (s->stop_mode == 1) {
> > +            if (!s->cache_stop) {
> > +                s->pad_stop = 0;
> > +                ff_outlink_set_status(outlink, AVERROR_EOF, s->pts);
> > +                return 0;
> > +            }
> >              frame = av_frame_clone(s->cache_stop);
> >              if (!frame)
> >                  return AVERROR(ENOMEM);
> >
> >
> The problem with this solution is that the tpad will then not do what we
> are expecting, which is padding video track, and the output file will not
> have the desired duration.
> Will it not be better to just output black frame (aka stop_mode == 0) ,
> something like that?
>

I doubt that, clone is clone, there is no point in padding stream that have
no frames at all.


>
> iff --git a/libavfilter/vf_tpad.c b/libavfilter/vf_tpad.c
> index e5acece1e4..5e4062e9f2 100644
> --- a/libavfilter/vf_tpad.c
> +++ b/libavfilter/vf_tpad.c
> @@ -140,7 +140,7 @@ static int activate(AVFilterContext *ctx)
>              ff_outlink_set_status(outlink, AVERROR_EOF, s->pts);
>              return 0;
>          }
> -        if (s->stop_mode == 0) {
> +        if (s->stop_mode == 0 || !s->cache_stop) {
>              frame = ff_get_video_buffer(outlink, outlink->w, outlink->h);
>              if (!frame)
>                  return AVERROR(ENOMEM);
>
>
>
>
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>
>
> --
>
> Thierry Foucu
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