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.mp4

Low risk

MPEG-4 Part 14 Video

The MPEG-4 container format that bundles video, audio, and subtitles. It is the de-facto universal video format — iPhones, Android, YouTube, everywhere.

MIME types

  • video/mp4
  • application/mp4

Category

video

Aliases

.m4v

What opens this file

  • QuickTime Player
  • VLC
  • mpv
  • Windows Media Player
  • IINA

How to open by OS

Windows

  • Windows Media Player or VLC.

Mac

  • QuickTime Player or IINA.

Linux

  • VLC, mpv, Totem.

Ios

  • Photos, Videos, Files.

Android

  • Google Photos, VLC.

Safety notes

  • The MP4 container is low-risk, but video decoders (e.g. FFmpeg) have had CVEs. Keep playback software current.

Common mistakes

  • Two MP4s can carry very different codecs (H.264, HEVC, AV1). Playback issues on older hardware are usually a codec problem, not a container problem.
  • Messaging apps like WhatsApp and LINE re-encode videos aggressively. Use AirDrop, Google Drive, or iCloud to preserve quality.

FAQ

How do I shrink an MP4 without obvious quality loss?
HandBrake converting to H.265 (HEVC) typically yields 30-50% smaller files at the same perceptual quality. For broad distribution, keep an H.264 fallback for compatibility.

Related extensions

References