[FFmpeg-devel] [PATCH 1/2] avfilter/vf_colorkey: Add colorkey video filter

Nicolas George george at nsup.org
Thu Jun 11 19:37:51 CEST 2015

Le tridi 23 prairial, an CCXXIII, Timo Rothenpieler a écrit :
> +static int offset_r(int fmt)

You can use the info in AVPixFmtDescriptor for these.

> +    default:
> +        return 0;

av_assert0(!"reached"); for the default case.

> +    frame->format = convert_format(frame->format);

I am not sure this is legal. It would probably be wiser to allocate a new

> +    outlink->format = convert_format(avctx->inputs[0]->format);

This is really not legal. You need to return EAGAIN from query_formats()
until the input format is known.

Or you can solve both problems at once by requiring alpha on the input
format and not doing any format change at all. I find that solution is the


  Nicolas George
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