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.mp4 file extension

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MPEG Audio Layer 4 file. A .mp4 file is a container, meaning that it can contain any number of audio, subtitle or video streams.

Contrary to the MPEG 4 specification, Apple use the .m4a file extension but the two file formats are otherwise identical.

Can you add to this? Do you know of any applications not already listed which will work with .mp4 files, view .mp4 files or open .mp4 files? Are you able to contribute any additional reference information or file format information about .mp4 files or have you spotted any errors or omissions? If so please let us know by emailing us at feedback@cryer.co.uk - Thank you.