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What is the MP4 file format?
Files with the .mp4 extension contain audio and video streams held inside a flexible container file defined by the MPEG-4 Part 14 standard (ISO/IEC 14496-14). The container is codec-agnostic: it can carry video encoded with H.264 (AVC), H.265 (HEVC), AV1, or the older MPEG-4 Part 2 codec, paired most commonly with AAC audio. The file may also include metadata, chapter markers, subtitles, still images, and multiple audio tracks, though these optional features are used less often. It supports progressive download and adaptive HTTP streaming (HLS, MPEG-DASH), making it the dominant delivery container on the web and mobile platforms.
The standard is based on Apple's QuickTime format. It was originally standardised in 2001, and the MPEG-4 Part 14 specification - the current version - followed two years later in 2003. File identity is stored in an ftyp box at byte offset 4; the brand code that follows (isom, mp42, avc1, etc.) indicates the exact flavor.
The .mp4 container is shared by several related extensions:
.mp4- the most universal variant.m4a- audio-only; used by Apple for AAC or ALAC content, unencrypted.m4p- audio protected with Apple FairPlay DRM, formerly downloaded from iTunes.m4v- Apple's video variant, optionally FairPlay-protected; used for iTunes and Apple TV purchases
The .3gp format is derived from MP4 and was widely used on early mobile phones. Today .mp4 plays natively on virtually every smartphone, smart TV, web browser, and media player, and is the standard container for streaming services, screen recordings, and consumer camcorders.
Security & safety
RISK: LOWMP4 is a media container, not executable code, so a genuine MP4 is safe to play. Two cautions: (1) a file named "video.mp4.exe" or an MP4 from an untrusted source could be malware in disguise - check the real extension; (2) crafted media files have occasionally exploited player bugs, so keep your player (VLC, system codecs) updated. Online MP4 converters upload your video to a third party - avoid for private footage and use a local tool (VLC/HandBrake/ffmpeg) instead.
Format details
in a nutshellFULL NAMEMPEG-4 Part 14 Video File
DEVELOPERMoving Picture Experts Group (MPEG / ISO/IEC)since 2001 (MP4 v1, ISO/IEC 14496-1); MP4 Part 14 standardized 2003
CATEGORYVideo Files
MIME TYPEvideo/mp4
TYPEISO Base Media File Format container (binary); usually H.264/H.265 video + AAC audio
STANDARDOpen · royalty-free
MAGIC BYTES · FILE SIGNATURE
OFFSET
04050607
HEX
66747970
ASCII
ftyp
The 'ftyp' box marker sits at offset 4 (bytes 0-3 are the box size, often 00 00 00 18/20/1C). The brand that follows ('isom', 'mp42', 'M4V ', 'mp41', 'avc1' …) tells the exact MP4 flavor. MP4 shares ISO-BMFF structure with .mov, .m4v, .m4a, .3gp - all use ftyp at offset 4.
Programs that open MP4 files
Windows2 apps
VLC media player
Open-source Drag the MP4 onto VLC - plays any codec with no extra downloads; best fix for files that won't open elsewhere. 
Media Player (Windows 11)
Built-in Double-click the MP4 - the built-in Media Player (formerly 'Films & TV') plays it; HEVC video may need the HEVC extension. 
macOS2 apps
QuickTime Player
Built-in Double-click the MP4 to play in QuickTime; for HEVC/unusual codecs use VLC instead. 
Linux1 app
VLC media player
Open-source Open the MP4 in VLC (or GNOME Videos / mpv) - plays out of the box on most distros. 
Android1 app
VLC for Android
Open-source Open the MP4 in VLC or the built-in Files/Photos player; Android plays MP4 natively.
iOS1 app
Files / Photos (built-in)
Built-in Tap the MP4 in Files or share it to Photos; iOS plays MP4/H.264/HEVC natively. VLC for iOS covers odd codecs.
Web1 app
Any modern browser (HTML5)
Built-in MP4 (H.264 + AAC) plays directly in Chrome/Edge/Safari/Firefox via the HTML5 <video> element. Technical details
deep spec| Container standard | ISO Base Media File Format (ISO-BMFF), ISO/IEC 14496-14 |
| Common video codecs | H.264 (AVC), H.265 (HEVC), AV1, MPEG-4 Part 2 (ASP) |
| Common audio codecs | AAC, MP3, AC-3 (Dolby Digital), E-AC-3, ALAC, Opus |
| MIME type | video/mp4 |
| File signature (magic bytes) | "ftyp" at byte offset 4 (hex: 66 74 79 70); bytes 0-3 hold the box size |
| Brand codes | isom, mp41, mp42, avc1, M4V (Apple); identifies the exact MP4 flavor |
| Maximum resolution | No hard limit in the spec; 4K (3840×2160) and 8K (7680×4320) are commonly used |
| Subtitle and caption support | MPEG-4 Timed Text (TX3G), WebVTT-in-MP4, CEA-608/708 closed captions |
| Multi-track support | Multiple independent video, audio, and subtitle tracks within one file |
| Chapter markers | Named chapter entries embedded in the moov atom |
| Streaming protocols | Progressive download, HLS (HTTP Live Streaming), MPEG-DASH |
| DRM support | Common Encryption (CENC); compatible with Widevine, PlayReady, and FairPlay |
| Maximum file size | Up to 2^64 bytes using 64-bit extended box sizes (largesize field) |
| Metadata storage | iTunes-style atoms (moov/udta/meta) for title, artwork, GPS, ratings, and custom tags |
| Frame rate support | Variable (VFR) or constant (CFR); up to 120 fps and above depending on codec |
| HDR and color depth | 8-bit standard; 10-bit (HDR10, HLG) and 12-bit (Dolby Vision) via H.265/AV1 profiles |
| Released | 2001 (MP4 v1, ISO/IEC 14496-1); MP4 Part 14 standardized 2003 |
| Open standard | Yes · royalty-free |
| Specification | www.iso.org |
MP4 conversions
Possible
.MP4 .AVIGUIDE
Yes - convert MP4 to AVI with the free HandBrake app or a single ffmpeg command.
How to convert
.MP4 .MKVGUIDE
Yes, MP4 converts to MKV - and the fastest way is a lossless remux with MKVToolNix or FFmpeg that takes…
How to convert
.MP4 .MOVGUIDE
Yes - MP4 converts to MOV easily, and in most cases ffmpeg can do it as a lossless remux in seconds.
How to convert
.MP4 .MP3GUIDE
Yes - use VLC or one ffmpeg command to pull the audio out of any MP4 file.
How to convert
.MP4 .WMVGUIDE
MP4 converts to WMV by re-encoding with a free tool - ffmpeg or HandBrake handle it in a few clicks.
How to convert
.MP4 .WEBMGUIDE
Yes - use FFmpeg or HandBrake; both are free and handle the required re-encode from H.264/AAC to VP9/Opus.
How to convert
.MP4 .GIFGUIDE
Yes - the fastest way is ffmpeg on the command line or an online tool like Ezgif.
How to convert
.MP4 .DVDGUIDE
Yes - burn MP4 to a playable DVD disc using the free DVDStyler app or the paid ConvertXtoDVD.
How to convert
Community Q&A
asked by users
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Frequently asked questions
How do I open an MP4 file?
Just double-click it - Windows (Media Player), macOS (QuickTime), phones and browsers all play MP4 natively. If it won't open, install the free VLC media player, which plays any MP4 regardless of codec.
How do I convert an MP4 to MP3?
MP3 keeps only the audio. Use VLC (Media → Convert/Save, choose MP3), ffmpeg ('ffmpeg -i in.mp4 -vn out.mp3'), or an online converter. To keep quality, extract to M4A instead of re-encoding to MP3.
Why won't my MP4 file play?
It's almost always a missing codec for the video inside (often H.265/HEVC), not a broken file. Open it in VLC, which includes its own codecs, or install the HEVC extension on Windows.
What's the difference between MP4 and MP3?
MP3 is audio-only; MP4 is a multimedia container that holds video, audio, subtitles and more. They share the 'MPEG' name but are different formats - MP4 is not just a 'newer MP3'.
How do I make an MP4 file smaller?
Re-encode it at a lower bitrate or resolution, or to a more efficient codec (H.265). HandBrake (free) has presets for this; expect some quality trade-off for the size saving.
Is MP4 the same as MOV?
They're very close - both use Apple's ISO base media structure - so they often convert with a quick remux. MOV is Apple's QuickTime variant; MP4 is the cross-platform standard.
References
1ISO/IEC 14496-14 - MP4 file formatwww.iso.org
2VideoLAN - VLC media playerwww.videolan.org
