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H264 for iPod may be larger than 320 pixels wide
Authored by: azguy on Jan 19, '06 02:40:34PM
Strictly speaking, it's not the number of pixels that's the ultimate limit --- it's the number of 16px-by-16px "macroblocks" the image has: MPEG-4: You get 900 macroblocks H.264: You get 300 macroblocks This isn't to say that all resolutions must be divisible by 16 (they don't need to), but it is to say that partial macroblocks count as whole ones. There are dimensions that satisfy the (incorrect) total pixel limit, but violate the macroblock rule... they don't work.

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