HDTV = 1920x1080 (full HD), so just over 2MP. Regular DVD = TV = 720×576 (PAL) or just over 0.4MP. If you're writing each frame as a jpg, then you're right... maybe, what if you up the compression?. Most codecs work differently though. Basically they record a keyframe (1 complete frame) and then just record the differences between the keyframe and the next frame. Every so many frames a new complete frame is inserted.  There's variations to the theme, but that's basically it.

My point is, with video you can't really say "a frame is xxxx bytes" so 30 frames is 30 times xxxx bytes".

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