Grass Valley ProCoder 3 - Manual (Page 200)

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ProCoder 3
MPEG-1 Elementary Streams
MPEG-1 Elementary streams carry either audio or video, but not both.
The file extensions for MPEG-1 elementary streams are .mpv or .m1v for video
elementary streams and .mpa or .m1a for audio elementary streams.
MPEG-1 System Streams
MPEG-1 System streams carry both video and audio together in a multiplexed (mixed)
arrangement where audio and video data occur together.
The file extension for MPEG-1 system streams is .mpg but elementary streams are
often named .mpg as well.
MPEG-2 Elementary Streams
MPEG-2 Elementary streams carry either audio or video, but not both. Higher-end
DVD authoring software usually requires video in MPEG-2 elementary stream format.
The file extensions for MPEG-2 elementary streams are .m2v for video elementary
streams and .m2a for audio elementary streams.
MPEG-2 Program Streams
MPEG-2 Program streams carry both video and audio together in a multiplexed (mixed)
arrangement where audio and video data occur together. Some DVD authoring
applications require MPEG-2 Program streams for input.
The file extension for MPEG-2 Program streams is .m2p but some programs use .mp2
or .mpg instead.
MPEG-2 Transport Streams
MPEG-2 Transport streams carry one or more MPEG-2 Program streams. Transport
streams include extra data to provide additional robustness and are often used for
satellite transmissions and off-air HDTV broadcasts.
The file extension for MPEG-2 Transport streams is .m2t but some programs use as
.ts or .tp instead.
MPEG-4 Streams
MPEG-4 streams can carry both video and audio as well as additional data together
in a multiplexed (mixed) arrangement. MPEG-4 is often used for low-bandwidth
video playback on handheld devices and on low-bandwidth devices such as wireless
phones.
The file extension for MPEG-4 streams is usually .mp4 but MPEG-4 streams are
sometimes “wrapped” in QuickTime or AVI files.
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