Lets do something nice and answer myself.

How to achieve this?

Tracks from top to bottom:
  - VIDEO transparent CGI animation, no extra chroma key layers
  - VIDEO transitioning FROM (Overlay Mode > PorterDuff > DstAtop)
  - VIDEO transitioning TO (Overlay Mode > PorterDuff > SrcAtop)
  - VIDEO mask layer (what to enable will be white)


Now there is a bug, once a transition to black is added to the
transitioning TO video layer, the video will black out at some point.

And obviously to celebrate our working website and git repo a tutorial
on YouTube!

https://youtu.be/RCZuS4gy4BE


Op 16-11-2025 om 6:12 p.m. schreef Stefan de Konink:
> I want to achieve the following animation:
>
>   - Track 1: the CGI animation, it has transparency and a chroma layer
>   - Track 2: Video the animation runs over
>   - Track 3: the CGI animation transitions to
>
> Track 1 + 2 = the default operation, this works when stacking the
> animation on top of the video.
>
> But *without rendering twice*, how am I able to mask out the chroma key
> in the animation, so track 3 becomes visible under it?
>
>
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>
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--
Stefan
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