M2V
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M2V is an MPEG-2 Packetized Elementary Stream. It contains only video related data.
M2V files are normally destined to be multiplexed (muxed), which is the process of adding audio data and perhaps other streams such as subtitles, before use. M2Vs are created by demultiplexing (demuxing) an existing MPEG-2, or by converting another video format to MPEG-2.
The file extension M2V is mostly found with SFV Host Files.
[edit] Tools that multiplex M2Vs into MPEG-2s
mplex - part of the MJPEG tools package