[FFmpeg-devel] Filter with multiple inputs, specific format on second and third input?

[F.Sluiter]

Thanks Nicolas, can you be a bit more specific on how I can change it to
get what I need?
Or is it not possible?
Floris

2016-03-11 16:33 GMT+01:00 Nicolas George <george at nsup.org>:

> Le duodi 22 ventôse, an CCXXIV, F.Sluiter a écrit :
> > I am writing a filter that takes a video file and remaps pixels based on
> > second and third input.
> > second and third input are pgm files, which should give me a list of
> > integers (gray16) that I can use in the filter.
> > However ffmpeg by default converts my pgm files to YUV.
> > Is there a way to prevent that?
> >
> > Should I add something to the filter code to only accept gray16 encoded
> > files as second (xmap) and third (ymap) input, but keep arbitray video as
> > input1?
>
> Not add, change. See below.
>
> >
> > Command line:
> > # ffmpeg -i INPUT.avi  -i feep.pgm   -i feep.pgm  -lavfi '[0][1][2]remap'
> > OUTPUT.avi
> >
> >
> > static int query_formats(AVFilterContext *ctx)
> > {
> >     static const enum AVPixelFormat pix_fmts[] = {
> >         AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV440P,
> >         AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P,
> >         AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVA420P,
> > AV_PIX_FMT_YUV420P,
> >         AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
> >         AV_PIX_FMT_YUVJ411P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
> >         AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24,
> >         AV_PIX_FMT_ARGB, AV_PIX_FMT_ABGR, AV_PIX_FMT_RGBA,
> AV_PIX_FMT_BGRA,
> >         AV_PIX_FMT_0RGB, AV_PIX_FMT_0BGR, AV_PIX_FMT_RGB0,
> AV_PIX_FMT_BGR0,
> >         AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP,
> >         AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE
> >     };
> >
>
> >     return ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
>
> By using ff_set_common_formats(), you set the formats for all inputs and
> the
> output to a pointer to this list, the same copy in memory. That means (1)
> your second and third inputs do not accept gray16, and (2) all three inputs
> and the output must have the same format at the end.
>
> Regards,
>
> --
>   Nicolas George
>
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