Adobe After Effects RGB + Alpha doesn't show



:

RGB + Alpha
!

:

format options 4444 442
RGB + Alpha .

In Image 1 you have the output format set as Quicktime ProRes 422. Quicktime ProRes 422 doesn't support alpha channels. That's why its greyed out.

I'm assuming that after you switch the output format to AIFF, you then switch back to a format that does support alpha channels, such as Quicktime ProRes 4444.


:
https://cloudconvert.com/mov-to-mp4
https://community.adobe.com/t5/after.../td-p/12567424