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MPEG-4 Part 17

From Wikipedia, the free encyclopedia

MPEG-4 Part 17, orMPEG-4 Timed Text (MP4TT), orMPEG-4 Streaming text format is the text-basedsubtitle format forMPEG-4, published asISO/IEC 14496-17 in 2006.[1] It was developed in response to the need for a generic method for coding of text as one of the multimedia components within audiovisual presentations.[2]

It is also streamable, which was one of the main aspects when creating the format. It is mainly aimed for use in the.mp4 container, but can also be used in the.3gp container as3GPP Timed Text (TTXT), which is technically almost identical with .mp4 but more used incell phones. 3GPP Timed Text is exactly the same as MPEG-4 Timed Text when used in the .mp4 container. It can be also used in other file formats based on theISO base media file format.[3][4][5]

3GPP approved the Timed text format for3G multimedia services in 3GPP TS 26.245 in 2004.[6][7] MPEG-4 Part 17 (ISO/IEC 14496-17:2006) definedText Streams that are capable of carrying 3GPP Timed Text.[5] For 3GPP text streams, ISO/IEC 14496-17:2006 defined a generic framing structure suitable for transport of 3GPP text streams across a variety of networks (RTP andMPEG transport stream andMPEG program stream). The framing structure for text streams consists of so-called Timed Text Units (TTU).[1]

Supporting implementations

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QuickTime Pro andMP4Box can create or produce these subtitle streams out of various subtitle input formats. MP4Box uses theFourCCtx3g for MPEG-4 Timed Text because of its inherently higher compatibility. MPEG-4 Timed Text is heavily based onXML semantics.

On October 7, 2005,VideoLAN added decoding support for MPEG-4 Timed Text subtitles inVLC.[8]

On October 30, 2005,Gabest added decoding support for MPEG-4 Timed Text subtitles inMPC.[9]

See also

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References

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  1. ^abISO (2006)."ISO/IEC 14496-17:2006 - Information technology -- Coding of audio-visual objects -- Part 17: Streaming text format". ISO. Retrieved2009-10-19.
  2. ^ISO/IEC JTC 1/SC 29/WG 11 (July 2005),MPEG standardizes streaming of text, N7269(PDF), archived fromthe original(PDF) on 2014-05-12, retrieved2009-10-19{{citation}}: CS1 maint: numeric names: authors list (link)
  3. ^MP4REG."The 'MP4' Registration Authority - Registered Types - Brands". Archived fromthe original on 2009-12-08. Retrieved2009-10-19.{{cite web}}: CS1 maint: numeric names: authors list (link)
  4. ^MP4REG."The MP4 Registration Authority - Registered Types - Codecs". Archived fromthe original on 2004-08-28. Retrieved2009-10-19.{{cite web}}: CS1 maint: numeric names: authors list (link)
  5. ^abJan van der Meer (July 2005)."White Paper on Streaming Text – MPEG-4 part 17, ISO/IEC JTC1/SC29/WG11N7515". ISO. Archived fromthe original on 2012-07-27. Retrieved2009-10-19.
  6. ^3GPP."3GPP TS 26.245 - Transparent end-to-end Packet switched Streaming Service (PSS); Timed text format". Retrieved2009-10-19.{{cite web}}: CS1 maint: numeric names: authors list (link)
  7. ^3GPP (2004-06-18),3GPP TS 26.245 V6.0.0 (2004-06) - Transparent end-to-end Packet switched Streaming Service (PSS); Timed text format (Release 6)(ZIP, DOC), retrieved2009-10-19{{citation}}: CS1 maint: numeric names: authors list (link)
  8. ^"The VideoLAN Forums :: View topic - MPEG-4/3GPP Timed Text Subtitles?".forum.videolan.org. Archived fromthe original on 2007-03-13.
  9. ^"Media Player Classic supports Matroska v2, *.mp4, *.mov, and MPEG-4 Timed Text - Doom9's Forum".

External links

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MPEG-1 Parts
MPEG-2 Parts
MPEG-4 Parts
MPEG-7 Parts
MPEG-21 Parts
MPEG-D Parts
MPEG-G Parts
MPEG-H Parts
MPEG-I Parts
MPEG-5 Parts
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