For EDMAC channel, I should re-check 5D3 1.2.3 (don't remember if choosing channel 4 was something just because channel 12 was used during LV startup, or is actually used by something else during LiveView on 1.2.3).
Adding the 7D and the rest of the platforms would be great. @danne and I are trying to figure out the 550D but it seems that the EOSM, 650D and 700D are very similar while the other cameras will require different techniques. I would suggest merging what we know is working into the raw_video_10bit_12bit branch so we don't start duplicating our efforts. Then again, that's not my call. @Alex ?