MPEG program stream: Difference between revisions

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'''Program stream''' ('''PS''' or '''MPEG-PS''') is a [[container format (digital)|container format]] for [[multiplexing]] [[digital audio]], [[video]] and more. The PS format is specified in [[MPEG-1]] SystemsPart 1 (ISO/IEC 11172) and [[MPEG-2]] Part 1, Systems (ISO/IEC standard [http://neuron2.net/library/mpeg2/iso13818-1.pdf 13818-1]). The MPEG-2 Program Stream is analogous and similar to ISO/IEC 11172 Systems layer and it is forward compatible.<ref name="iso13818">ISO (2000-12-01) [http://neuron2.net/library/mpeg2/iso13818-1.pdf ISO/IEC 13818-1 : 2000, Second edition] Page X, Retrieved on 2009-07-25</ref> <ref>[http://books.google.com/books?id=L7N0LQvBKtYC&lpg=PA39&ots=P9VPn4q1zA&dq=mpeg%20program%20stream%20specification&hl=cs&pg=PA39 Data Broadcasting, MPEG-2 Transport Basics, MPEG-2 Program Stream], Retrieved on 2009-07-25</ref>

Program streams are created by combining one or more [[Packetized 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 to [[transport stream]] which is for data transmission in which loss of data is likely. Program streams have variable size records and minimal use of [[start code]]s which would make over the air reception difficult, but has less overhead.

MPEG-2 Program stream can contain MPEG-1 Part 2 video, [[MPEG-2 Part 2]] video, MPEG-1 Part 3 audio ([[MPEG-1 Audio Layer III|MP3]], [[MPEG-1 Audio Layer II|MP2]], [[[[MPEG-1 Audio Layer I|MP1]]) or MPEG-2 Part 3 audio.<ref name="iso13818"/> It can also contain [[MPEG-4 Part 2]] video, MPEG-2 Part 7 audio ([[Advanced audio coding|AAC]]) or MPEG-4 Part 3 (AAC) audio,<ref name="iso13818"/> but they are rarely used. International Organization for Standardization authorized [[SMPTE]] Registration Authority, LLC as the registration authority for MPEG-2 format identifiers. It publishes list of compression formats which can be encapsulated in MPEG-2 Transport stream and Program stream.<ref>[http://smpte-ra.org/mpegreg/mpeg.html SMPTE Registration Authority, LLC - registration authority for MPEG-2 format identifiers] Retrieved on 2009-07-06</ref>

Program streams are used on [[DVD]] video discs and [[HD DVD]] video discs. The file extensions are [[VOB]] and [[Enhanced VOB|EVO]] respectively. [[Blu-ray Disc|Blu-ray Discs]] use a [[MPEG transport stream|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&section=11].

Program streams are used on [[DVD-Video]] video discs and [[HD DVD]] video discs, but with some restrictions and extensions.<ref name="mpeg-dvd">[http://dvd.sourceforge.net/dvdinfo/dvdmpeg.html DVD - MPeg differences], Retrieved on 2009-07-24</ref><ref>MPEG.org (July 21, 1996) [http://www.mpeg.org/MPEG/DVD/Book_B/Video.html DVD Technical Notes - Video Data Specifications], Retrieved on 2009-07-25</ref> The file extensions are [[VOB]] and [[Enhanced VOB|EVO]] respectively. [[Blu-ray Disc|Blu-ray Discs]] use a [[MPEG transport stream|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&section=11].

International Organization for Standardization authorized [[SMPTE]] Registration Authority, LLC as the registration authority for MPEG-2 format identifiers.<ref>[http://smpte-ra.org/mpegreg/mpeg.html SMPTE Registration Authority, LLC - registration authority for MPEG-2 format identifiers] Retrieved on 2009-07-06</ref>

==Coding structure==