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MPEG-4

Writable

audio

video encoding standard

Identify it

Extensions	`.mp4.m4a.m4b.m4p.m4r.aac`
MIME types	`video/mp4`
PRONOM	`fmt/199`
Wikidata	`Q219763`
Library of Congress	`fdd000037`

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Open it

OpenH264Open sourcereads and writes · 2-clause BSD License
MicroDicomreads · proprietary license
Quick Lookreads

Convert it

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Versions and variants (3)

Sources

From Just Solve the File Format Problem (File Formats Wiki), Wikidata. Updated 2026-10-24.

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