
An elementary stream (ES) as defined by MPEG communication protocol is usually the output of an audio or video encoder. ES contains only one kind of data, e.g. audio, video or closed caption. An elementary stream is often referred to as `elementary`, `data`, `audio`, or `video` bitstreams or streams. The format of the elementary stream dep...
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http://en.wikipedia.org/wiki/Elementary_stream

The output of an MPEG video encoder is a video elementary stream and the output of an audio encoder is an audio elementary stream. Before being multiplexed video and audio elementary streams are packetized to form the Video PES and the Audio PES. PES Packet structure The packet length is variable: Header packet start-code prefix (3bytes) stream i.....
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http://www.videohelp.com/glossary?E
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