[FFmpeg-user] Color Channel Expression

[Paul B Mahol]

On 7/31/17, Jon bae <jonbae77 at gmail.com> wrote:
> Hello,
> is there a way to make simple channel expressions in ffmpeg.
> I would need to make something like this:
>
> input > red/alpha , green/alpha , blue/alpha > output
>
> I try this with the geq filter, but without success.

What exactly you tried?

Perhaps you want premultiply filter?

>
> Have you an idea, how I can do this?
>
> Regards
> Jonathan
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