Though Adobe Photoshop CS6/CS5/CS4 was announced to be compatibility with MP4, people still have problems in importing MP4 to Photoshop CS6/CS5/CS4. MP4 file format is a container format which defines the storage of MPEG-4 audio, scenes and multimedia content using the ISO Base Media File Format, the MP4 file may also contain any number of audio, video, and even subtitle streams. So it is impossible for the MP4 file to determine the type of streams in an MPEG-4 file based on its filename extension alone. If you have problem of importing MP4 to Photoshop CS5/CS4/CS3 on Windows or on Mac, it is better to convert MP4 to Photoshop CS6/CS5/CS4 supported video format MPEG-4.
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