Do we need a gamma correction field?
Sebi: How about specifying the color space (ie sRGB) -- And why not merging OggRGB and OggYUV with an additional color space identifier ?
Is there ever a case where RGB video has non-square pixels, ie, do we need an aspect ratio?
Sebi: Storing that won't hurt. I'd do so. (Recall DVD resolutions, 720x480 (NTSC) or 720x576 is supposed to be DAR 4:3 or 16:9 (DAR = display aspect ratio))