Well, I’m not exactly sure what I did differently but I have it working with 1024x1024 PNG with an alpha.
@Max Chen - is there any way to have a tracking matte combined with footage in sequencer to take out the background? PNGs with alpha seems a little heavy and I’m wondering if a png sequence with the content and then another with a black/white tracking matte might be less computationally intense.
I know in the composure example there are mattes in sequencer but I need could get them to work outside of that project. There isn’t a lot of documentation for these sorts of more video/animation related things.