[FFmpeg-devel] [PATCH v2 03/18] avfilter/vf_showinfo: print alpha mode when relevant
Niklas Haas
ffmpeg at haasn.xyz
Thu Jul 24 14:19:29 EEST 2025
On Wed, 23 Jul 2025 18:11:23 +0200 Kacper Michajlow <kasper93 at gmail.com> wrote:
> On Wed, 23 Jul 2025 at 15:57, Niklas Haas <ffmpeg at haasn.xyz> wrote:
> >
> > From: Niklas Haas <git at haasn.dev>
> >
> > ---
> > libavfilter/vf_showinfo.c | 8 ++++++++
> > 1 file changed, 8 insertions(+)
> >
> > diff --git a/libavfilter/vf_showinfo.c b/libavfilter/vf_showinfo.c
> > index c706d00c96..b564d03a84 100644
> > --- a/libavfilter/vf_showinfo.c
> > +++ b/libavfilter/vf_showinfo.c
> > @@ -887,6 +887,14 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
> >
> > dump_color_property(ctx, frame);
> >
> > + if (desc->flags & AV_PIX_FMT_FLAG_ALPHA) {
> > + const char *alpha_mode_str = av_alpha_mode_name(frame->alpha_mode);
> > + if (!alpha_mode_str || frame->alpha_mode == AVALPHA_MODE_UNSPECIFIED)
> > + av_log(ctx, AV_LOG_INFO, "alpha_mode:unknown\n");
>
> Looking at other patches you used `unspecified`, I don't know the
> distinction, but should be consistent about one name.
Fixed. Maybe we should settle on a clear naming convention for these
fields in general? The enums are all named _UNSPECIFIED, but av_color_*_name()
instead returns "unknown" for them, with the sole current exception of
av_chroma_location_name().
Maybe we should update all of these strings to match the formal enum name.
>
> > + else
> > + av_log(ctx, AV_LOG_INFO, "alpha_mode:%s\n", alpha_mode_str);
> > + }
> > +
> > return ff_filter_frame(inlink->dst->outputs[0], frame);
> > }
> >
> > --
> > 2.50.1
> >
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