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Video alpha not creating a shadow

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Posted (edited)

I’ve rendered a video out to an image sequence of .pngs with alpha. I created a standard material and applied the image sequence, calculated to load the stills, and checked “animate preview”. I applied the alpha to the alpha channel similarly.  I applied this material to a plane and everything works and looks right in the perspective window. I created a light and enabled shadows to be cast onto the face of a background cube. 
But the shadow being cast is of the plane carrying the video, not the outline of the alpha channel. So now my video is casting a rectangle as a shadow. 
I’ve tried applying compositing tags to each with no luck. This seems simple but what is my simple mind missing? 


My skill level with C4D is novice.


iMac i7



Edited by Cerbera
removed formatting

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The alpha that's built into your original png render may be the problem.

You might need to render a separate alpha, as a black and white image sequence, then add that to the Alpha section of the C4D material.

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Do you render to video directly? Try to small range of frames render to image sequence instead of video output. Maybe could be problem in used codec for video...

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