| ismt | IIS Smooth Streaming Text Stream |
| ismv | IIS Smooth Streaming Video |
| iv8 | IndigoVision 8000 Video |
| iva | Surveillance Video |
| ivf | Indeo Video File |
| ivr | Internet Video Recording Stream |
| jmm | JVC Multimedia File |
| jmv | Jnes Recorded Video |
| jnr | JoinNet Recording Data |
| jpf | Sony Network Camera JPEG Video |
| jpv | IVC Video File |
| jss | JACOSub Subtitle File |
| jtv | JRiver Recorded TV |
| jvt | JRiver Media Center Recorded Video |
| k3g | Mobile Video |
| kmv | Sansui Mobile DJ Video |
| kux | Youku KUX Video |
| l3 | L3 Media File |
| lmv | LiveSwif Movie |
| lmv | LEGO CAD Movie |
| lrv | GoPro Low Resolution Video |
| lsf | Streaming Media Format Video |
| lsx | Streaming Media Shortcut |
| ltv | Altitude Express Video |
| lza | Lempel-Ziv-Oberhumer Compressed Animation |
| m00 | Magic Lantern RAW Video |
| m01 | Magic Lantern RAW Video |
| m02 | Magic Lantern RAW Video |
| 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 |