MPEG program stream: Difference between revisions

Revision as of 14:01, 12 August 2010

Revision as of 08:26, 13 August 2010

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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 [[MPEG 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. Program stream coding layer allows only one [[MPEG transport stream#Programs|program]] of one or more elementary streams to be combined into a single stream, in contrast to transport stream, which allows multiple programs.<ref name="iso13818" />

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.{{citationCitation needed|reason=MPEG-4 Part 2 streams can be found in many countries and increasingly so as ASO continues worldwide|date=August 2010}} The MPEG-2 Program stream has provisions for non-standard data (e.g. [[AC-3]] audio or subtitles) in the form of so-called private streams.<ref name="whatisvob">[http://www.mpucoder.com/DVD/vobov.html What is a VOB file], Retrieved on 2009-07-26</ref> 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, 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 filename extensions are [[VOB]] and [[Enhanced VOB|EVO]] respectively. [[Blu-ray Disc|Blu-ray]] Video discs contain streams in BDAV container, which is based on the [[MPEG transport stream]] (TS) format<ref name="bdav">AfterDawn.com [http://www.afterdawn.com/glossary/terms/bdav.cfm Glossary - BDAV container], Retrieved on 2009-07-26</ref><ref name="bdvm">AfterDawn.com [http://www.afterdawn.com/glossary/terms/bd-mv.cfm Glossary - BD-MV (Blu-ray Movie) and BDAV container], Retrieved on 2009-07-26</ref><ref name="bdav-videohelp">Videohelp.com [http://www.videohelp.com/hd What is Blu-ray Disc and HD DVD?], Retrieved on 2009-07-26</ref> with an additional 4 byte time code added to the beginning of each TS packet ([[MPEG transport stream#Modifications of transport stream specification for random-access media (M2TS)|modification of TS for random-access media]]).

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{{Compression Formats}}

{{DEFAULTSORT:Mpeg Program Stream}}

[[Category:Container formats]]

[[Category:MPEG]]