RENDER IMAGE SEQUENCE WITH ALPHA

Hi, we're creating stylized cinematic sequences for AAA games here at Blackbird Interactive and we just bought a few licences of Studio Artist 5 to use in our pipeline, however we have hit a major snag that has stopped us in our tracks: 

We need to load videos with an alpha channel into Studio Artist 5, run a PAS on each frame, and export each frame into an image with an alpha channel.

The closest I can get is to load up the video, and under Canvas / Alpha, turn on Paint Synth Alpha Enable,

then under Canvas / Alpha / Set to /, turn on Source Alpha,

then under Action / Process with Paint Action Sequence / Movie To Image, which does indeed begin rendering a sequence of images with an alpha. The problem is: each image only uses the alpha of the FIRST FRAME of the source video. In other words, the alpha channel in every image is exactly the same, even though the image is changing.

Does anyone know how to get around this? We like the look and capabilities of Studio Artist 5, surely there must be a way to do a pretty standard conversion like this.

Cheers

-N-

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