| m03 | Magic Lantern RAW Video |
| m04 | Magic Lantern RAW Video |
| m05 | Magic Lantern RAW Video |
| m1pg | Media 100 iFinish Video Clip |
| m1v | Mpeg Video |
| m2p | Mpeg-2 Program Stream |
| m2ps | Mpeg-2 Program Stream |
| m2t | MPEG-2 Transport Stream |
| Sony AVCHD Video |
| m2ts | Sony AVCHD Video |
| m2v | Mpeg Video |
| m4f | Sony Network Camera MPEG-4 Video |
| m4s | GPAC MP4Box MP4 Video Segment |
| m4u | M4U Playlist File |
| m4v | iTunes M4V Video |
| m65 | REI Camera System Video |
| m75 | MPEG Video |
| map | HD DVD Advanced Content Time Map |
| matroska | Matroska Video |
| mbr | Zune Smooth Streaming File |
| mcam | MediaCam Video |
| mcc | MacCaption Closed Caption File |
| mcmovie | MadCap Mimic Movie |
| mcmv | MadCap Mimic Movie |
| mgv | Sony PSP Video |
| mimov | MadCap Mimic Movie |
| mj2 | Motion JPEG 2000 Video |
| mjp | MJPEG Video |
| mjp2 | Motion JPEG 2000 Video |
| mjpeg | MJPEG Video |
| mjpg | MJPEG Video |
| mk3d | Matroska Stereoscopic/3D Video |
| mks | Matroska Subtitle |
| mkv | Matroska Video |
| mkv3d | Matroska Stereoscopic/3D Video |
| ml20 | Mercury Messenger for Mac Video |
| MSN Webcam Recorder Video |
| mlv | Magic Lantern RAW Video |
| mmv | Sony MicroMV Video |
| mod | HDD Camcorder Video Data |
| JVC Everio Video |
| modd | Sony AVCHD Metadata |
| moff | Sony AVCHD Index |
| moi | HDD Camcorder Time-Stamp Data |
| moov | QuickTime Movie |
| mov | QuickTime Movie |
| movie | QuickTime Movie |
| SGI Movie |
| mp2p | Mpeg 2 Stream |
| mp2t | MPEG-2 Transport Stream |
| mp2v | Mpeg Video |
| mp4 | Mpeg-4 Video Container |
| mp41 | Microsoft MPEG-4 v1 Video |
| mp4s | Mpeg-4 Video Container |
| mp4v | Mpeg-4 Video Container |
| mpb | TruVideo Video-only Stream |
| mpe | Mpeg Video |
| mpeg | Mpeg Video |
| mpeg-4 | Mpeg-4 Video Container |
| mpeg-ps | MPEG Program Stream Data |
| mpeg1 | Mpeg Video |
| mpeg2 | Mpeg Video |
| mpeg4 | Mpeg-4 Video Container |
| mpegps | MPEG Program Stream Data |
| mpg | Mpeg Video |
| mpg2 | Mpeg Video |
| mpg4 | Mpeg-4 Video Container |
| mpl | MPL2 Subtitle Data |
| mpng | Motion PNG Animation |
| mpsub | MPlayer Subtitles File |
| mpv | Mpeg Video |
| mpv2 | Mpeg Video |
| mpv4 | Mpeg-4 Video Container |
| mqv | Sony Clie Video |
| ms-asf | Advanced Systems Format Media |
| ms-dvr | AVS Media Player MS-DVR Video |
| ms-wmv | Windows Media Video |
| msnwctcp | MSN TCP Webcam Stream |
| mtv | AMV Encoded Video |
| mv4 | Mpeg-4 Video Container |
