Apple's MPEG-4 video variant, commonly DRM-wrapped iTunes video.
| 0x00000004 | 66747970 | ftyp | ISO-BMFF 'ftyp' box |
| 0x00000008 | 4D345620 | M4V | brand 'M4V ' |
M4V is essentially MP4 as used by the iTunes Store, sometimes with FairPlay DRM; renaming to .mp4 usually plays the unprotected ones. Its 'ftyp' brand is 'M4V '.
Have a file that might be M4V? Identify it with the File Type Identifier — it reads the magic number locally, nothing is uploaded. Or browse all formats.