@dlrpgmsvc: I believe you are half correct. H.264 is indeed YUV, subsampled at 4:2:0. But the raw video that ML now delivers is, according to a1ex himself in a tweet to Stu Maschwitz, 14-bit RGGB, that is: uncompressed, not-yet-debayered, 14-bits per pixel data straight from the sensor, with the only intermediate step being Canon's mysterious, black-box reduction (binning? line-skipping? both?) of the sensor resolution of 5184x3456 down to the Live View resolution, which varies by camera and is apparently 1728x974 for the 550D. Though it is true that the sensor array has twice as many sensels (?) for the G channel as it does for R and B, I don't think it's correct to call it either YUV or 4:2:2. IMHO, of course. Cheers!