- Program stream
Program stream (PS or MPEG-PS) is a container format for multiplexing
digital audio ,video and more. The PS format is specified inMPEG-1 Systems andMPEG-2 Part 1, Systems (ISO/IEC standard [http://neuron2.net/library/mpeg2/iso13818-1.pdf 13818-1] ). Program streams are created by combining one or morePacketized Elementary Stream s (PES), which have a common time base, into a single stream. It is designed for reasonably reliable media such as disks, in contrast totransport stream which is for data transmission in which loss of data is likely. Program streams have variable size records and minimal use ofstart code s which would make over the air reception difficult, but has less overhead.Program streams are used on
DVD video discs andHD DVD video discs. The file extensions areVOB and EVO respectively. Blu-ray Discs use a transport stream (TS) format with an additional 4 byte time code added to the beginning of each TS packet [http://en.wikipedia.org/w/index.php?title=MPEG_transport_stream&action=edit§ion=11] .Coding structure
If you open up an unencrypted VOB file or other program stream with a
hex editor you will see the following structure.References
ee also
*
Elementary stream
*Transport stream
*MPEG-1
*MPEG-2 External links
* [http://www.chiariglione.org/mpeg/standards/mpeg-2/mpeg-2.htm MPEG-2]
Wikimedia Foundation. 2010.