[FFmpeg-user] Split Video into RGB and Alpha

Michael Koch astroelectronic at t-online.de
Tue Jan 4 23:05:17 EET 2022

Am 04.01.2022 um 18:04 schrieb Hanna Frangiyyeh:
> Hi Michael;
> Sorry I'm a novice to ffmpeg, is there a way to do it in one command pass.
> Also, do you have command that you can share?

Here is an example:

rem  Make a short test video with alpha channel

ffmpeg -f lavfi -i testsrc2=s=1920x1080:d=3 -lavfi 
format=rgba,geq=a='255*gt(X,Y)':r='r(X,Y)':g='g(X,Y)':b='b(X,Y)' -c:v 
prores_ks -y test.mov

rem  Extract the RGB channels

ffmpeg -i test.mov -pix_fmt rgb48le -y rgb.mov

rem  Extract the alpha channel

ffmpeg -i test.mov -lavfi extractplanes=a -y alpha.mov

It's possible to do all in one command, but it's easier if you make it 
in two steps.


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