MPEG-4 Media File
Unknownaudio
Container format that can contain any of a number of audio and video codecs. It may also contain subtitle data or file metadata. This family of container can be used with several different file extensions.
Identify it
| Extensions | .mp4.m4v.m4a.f4v.f4a.m4b |
|---|---|
| MIME types | application/mp4video/mp4 |
| Signatures | 66747970 at byte 4 (MP4 Media File) |
| PRONOM | fmt/199 |
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Open it
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Convert it
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Sources
From PRONOM. Updated 2026-06-09.