MP4 vs MOV: what is the difference, and does it matter for repair?
By the FixMP4 engineering team · · 6 min read
iPhones record .MOV. GoPros, Android phones and most drones record .MP4. Some cameras let you choose. People reasonably wonder whether one is better, whether converting between them loses quality, and whether a broken MOV needs a different fix than a broken MP4.
Same family, same structure
MP4 (formally ISO/IEC 14496-14, built on the ISO Base Media File Format) was derived from Apple's QuickTime file format. Both store data in nested boxes (atoms): ftyp for the file type, mdat for the media, moov for the index, with tracks, sample tables and metadata inside moov. A tool that understands one understands most of the other.
| MP4 | MOV | |
|---|---|---|
| Origin | ISO standard based on QuickTime | Apple QuickTime |
| Typical brand in ftyp | isom, mp42, avc1 | qt |
| Common codecs | H.264, HEVC, AAC | H.264, HEVC, ProRes, AAC, PCM |
| Metadata | ISO and iTunes-style | QuickTime metadata keys |
| Typical sources | Android, GoPro, DJI, web | iPhone, Mac, many pro cameras |
| Plays in browsers | Yes (with H.264/HEVC support) | Often, but less consistently |
What actually differs
- Codecs: MOV commonly carries professional codecs such as ProRes and uncompressed PCM audio; MP4 is focused on delivery codecs.
- Metadata: iPhone MOV files carry QuickTime metadata (location, device model, live photo pairing) that some MP4 tools ignore.
- Edit lists and timecode: both support them; pro MOV files use timecode tracks more often.
- Compatibility: MP4 is the safer choice for the web and for non-Apple devices.
Is converting lossy?
Not if you remux: copy the streams into the other container without re-encoding (for example ffmpeg -i in.mov -c copy out.mp4). That is fast and lossless for H.264, HEVC and AAC. Converting with re-encoding (as many online converters and "Save as" options do) costs time and quality.
When renaming works
Because the structures are so similar, renaming an iPhone .MOV to .MP4 often satisfies a picky uploader. It does not change the content. It fails when the MOV contains a codec the destination does not accept, like ProRes or PCM audio, and it never repairs a damaged file.
Do they break differently?
No. Both write the moov index at the end of recording, and both become unplayable when recording stops before that happens. The symptoms are the same: "moov atom not found", "file not supported", 0:00 duration. Read why recordings get corrupted for the causes.
The repair is the same too: scan the media data, identify H.264 or HEVC frames and AAC audio frames, take the codec configuration from a reference recorded with the same settings, and write a new index. The FixMP4 repair tool does this for both containers. Guides: repair a MOV file and repair an MP4 file.
What is not supported
FixMP4 does not rebuild ProRes MOV files or PCM-only audio tracks. For iPhone ProRes footage, see the notes in fix iPhone video.
Which should you record?
If your device offers both and you edit on a Mac, either is fine. If you share raw files widely or upload directly to the web, MP4 avoids small compatibility surprises. For safety against corruption the container makes no difference; power, storage and a clean stop do. See our prevention checklist.
Frequently asked questions
Is MOV the same as MP4?
They are close relatives. MP4 is based on Apple's QuickTime MOV format and uses the same box structure, but each has its own brands, codec options and metadata conventions.
Can I rename a MOV to MP4?
Often, when the MOV contains H.264 or HEVC with AAC, a picky app will accept it. Renaming never fixes a damaged file.
Can FixMP4 repair MOV files?
Yes. MOV files with H.264 or HEVC video and AAC audio are repaired the same way as MP4.
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