Extract pixel data from video stream

Maybe this will help: http://www.nioswiki.com/exampledesigns/modular_sgdma_video_frame_buffer

If you look at the C code that'll give you a good idea how difficult (or easy...) it is to manage the frame buffers with that hardware. That design has a bursting bug so if you want to use it and need bursting let me know and I can send you the fix for the read master (I'm working on a final bug fix and want to post them at the same time).