Here is a short test of recording continuous raw video using Canon 600d/T3i...i used FPS override to 12fps and got 1280X720 at 16:9...my SD card is Sony SDHC 94mb/s...i am not sure if this can be used with regular project but i do hope this can overcome the write speed of our slow sd controller on mid range DSLR's...its my humble request to all the senior members of this community to have a look & bring about some discussion on this topic...though the video listed below is merely 12s at length, i did test it for more than 3 minutes...but didn't dare to process it only for testing purpose...
https://www.youtube.com/watch?v=WiEvKV0N1dk
https://www.youtube.com/watch?v=WiEvKV0N1dk