It publishes list of compression formats which can be encapsulated in MPEG-2 transport stream and program stream. International Organization for Standardization authorized SMPTE Registration Authority, LLC as the registration authority for MPEG-2 format identifiers. AC-3 audio or subtitles) in the form of so-called private streams. The MPEG-2 Program stream has provisions for non-standard data (e.g. It can also contain MPEG-4 Part 2 video, MPEG-2 Part 7 audio (AAC) or MPEG-4 Part 3 (AAC) audio, but they are rarely used. MPEG-2 Program stream can contain MPEG-1 Part 2 video, MPEG-2 Part 2 video, MPEG-1 Part 3 audio (MP3, MP2, MP1) or MPEG-2 Part 3 audio. The filename extensions are VOB and EVO respectively. Program streams are used on DVD-Video discs and HD DVD video discs, but with some restrictions and extensions. The MPEG-2 Program Stream is analogous and similar to ISO/IEC 11172 Systems layer and it is forward compatible. The PS format is specified in MPEG-1 Part 1 (ISO/IEC 11172-1) and MPEG-2 Part 1, Systems (ISO/IEC standard 13818-1/ITU-T H.222.0). Program stream (PS or MPEG-PS) is a container format for multiplexing digital audio, video and more.
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