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On the Apple website it is said that

Camera Connection Kit support standard photo formats, including JPEG and RAW, along with SD and HD video formats, including H.264 and MPEG-4.

aren't H.264 and MPEG4 the same thing? I thought that there are two names only because different standard consortiums have different terminology.

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up vote 1 down vote accepted

With MPEG-4 you generally mean H.263, the predecessor of H.264. It has lower compression and therefore lower image quality at same bit rate.

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H.264 = MPEG-4 AVC = MPEG-4 Part 10

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