3GP and 3G2

Source: Wikipedia, the free encyclopedia.
3GP
Filename extension
.3gp, .3gpp
Internet media type
video/3gpp, audio/3gpp
MPEG-4 Part 12
Open format?Yes
Free format?No
3G2
Filename extension
.3g2, .3gp2, .3gpp2
Internet media type
video/3gpp2, audio/3gpp2
MPEG-4 Part 12
Open format?Yes
Free format?No

3GP (3GPP file format) is a

container format defined by the Third Generation Partnership Project (3GPP) for 3G UMTS multimedia services. It is used on 3G mobile phones but can also be played on some 2G and 4G
phones.

3G2 (3GPP2 file format) is a multimedia container format defined by the

3GPP2 for 3G CDMA2000
multimedia services. It is very similar to the 3GP file format but consumes less space & bandwidth, and has some extensions and limitations in comparison to 3GP.

Specifications

3GP is defined in the ETSI 3GPP technical specification.[1] 3GP is a required file format for video and associated speech/audio media types and timed text in ETSI 3GPP technical specifications for IP Multimedia Subsystem (IMS), Multimedia Messaging Service (MMS), Multimedia Broadcast/Multicast Service (MBMS) and Transparent end-to-end Packet-switched Streaming Service (PSS).[3][4][5][6]

3G2 is defined in the

3GPP2 technical specification.[2]

Technical details

Relations between ISO Base Media File Format, MP4 File Format, 3GPP file format and 3GPP2 file format. Based on the 3GPP2 technical specification published on 18 May 2007.[7]

The 3GP and 3G2 file formats are both structurally based on the

MPEG-4 Part 14 (MP4), which is also based on MPEG-4 Part 12. The 3GP and 3G2 file format were designed to decrease storage and bandwidth requirements to accommodate mobile phones
. They are good for lower end smartphones for faster streaming & download.

3GP and 3G2 are similar standards, but with some differences:

Some cell phones use the .mp4 extension for 3GP video.

3GP

The 3GP file format stores video streams as

HE-AAC v1 or Enhanced aacPlus (HE-AAC v2). 3GPP allowed use of AMR and H.263 codecs in the ISO base media file format (MPEG-4 Part 12), because 3GPP specified the usage of the Sample Entry and template fields in the ISO base media file format as well as defining new boxes to which codecs refer. These extensions were registered by the registration authority for code-points in ISO base media file format ("MP4 Family" files).[11]
[12] For the storage of MPEG-4 media specific information in 3GP files, the 3GP specification refers to MP4 and the AVC file format, which are also based on the ISO base media file format. The MP4 and the AVC file format specifications described usage of MPEG-4 content in the ISO base media file format.[8]

A 3GP file is always big-endian, storing and transferring the most significant bytes first. [citation needed]

3G2

The 3G2 file format can store the same video streams and most of the audio streams used in the 2007 3GP file format. In addition, 3G2 stores audio streams as

Timed Text. 3G2 file format does not store Enhanced aacPlus (HE-AAC v2) and AMR-WB+ audio streams.[7] For the storage of MPEG-4 media (AAC audio, MPEG-4 Part 2 video, MPEG-4 Part 10 – H.264/AVC) in 3G2 files, the 3G2 specification refers to the MP4 file format and the AVC file format specification, which described usage of this content in the ISO base media file format. For the storage of H.263 and AMR content 3G2 specification refers to the 3GP file format specification.[7]

Device support

  • Most 3G capable mobile phones support the playback and recording of video in 3GP format (memory, maximum filesize for playback and recording, and resolution limits exist and vary). [citation needed]
  • Some newer/higher-end phones without 3G capabilities may also playback and record in this format (again, with said limitations). [citation needed]
  • Audio imported from CD onto a PlayStation 3 when it is set to encode to the MPEG-4 AAC format copies onto USB devices in the 3GP format. [citation needed]
  • The Nintendo 3DS used 3GP technology to play YouTube videos.
  • Apple
    H.264. [citation needed
    ]

Software support

When transferred to a computer, 3GP movies can be viewed on

Totem, RealPlayer, MPlayer, and GOM Player
can also be used.

3GP and 3G2 files can be encoded and decoded with open source software FFmpeg.[16]

See also

References

  1. ^ a b c ETSI 3GPP 3GPP TS 26.244; Transparent end-to-end packet switched streaming service (PSS); 3GPP file format (3GP) Retrieved on 2009-06-02.
  2. ^
    3GPP2
    . 2003. Retrieved 2009-06-12.
  3. ^ ETSI (2009-04) ETSI TS 126 234 V8.2.0 (2009-04); 3GPP TS 26.234; Transparent end-to-end Packet-switched Streaming Service (PSS); Protocols and codecs Page 58. Retrieved on 2009-06-02.
  4. ^ ETSI (2009-01) ETSI TS 126 140 V8.0.0 (2009-01); 3GPP TS 26.140; Multimedia Messaging Service (MMS); Media formats and codes Page 11. Retrieved on 2009-06-02.
  5. ^ "ETSI TS 126 346 V8.3.0 (2009-06); 3GPP TS 26.346; Multimedia Broadcast/Multicast Service (MBMS); Protocols and codecs". ETSI. June 2009. p. 85. Retrieved 2009-10-13.
  6. ^ ETSI (2009-01) ETSI TS 126 141 V8.0.0 (2009-01); 3GPP TS 26.141; IP Multimedia System (IMS) Messaging and Presence; Media formats and codecs Page 10. Retrieved on 2009-06-02.
  7. ^ a b c d "3GPP2 C.S0050-B Version 1.0, 3GPP2 File Formats for Multimedia Services" (PDF). 3GPP2. 18 May 2007. pp. 67, 68. Archived from the original (PDF) on 7 October 2009. Retrieved 2009-06-12.
  8. ^ a b "3GPP TS 26.244; Transparent end-to-end packet switched streaming service (PSS); 3GPP file format (3GP)" (PDF). ETSI 3GPP. 2008-12-11. p. 9. Retrieved 2009-05-30.
  9. ^ "ISO Base Media File Format white paper – Proposal". April 2006. Archived from the original on 2008-07-14. Retrieved 2009-12-26.
  10. ^ "ISO Base Media File Format white paper – Proposal". Chiariglione. October 2009. Retrieved 2009-12-26.
  11. ^ "ISO/IEC 14496-12:2008, Information technology -- Coding of audio-visual objects -- Part 12: ISO base media file format" (PDF). International Organization for Standardization. 2008. p. 95. Retrieved 2009-05-30.
  12. ^ a b "Registered types – Codecs". Registration authority for code-points in "MP4 Family" files – mp4ra.org. 2008. Archived from the original on 2009-04-19. Retrieved 2009-05-31.
  13. ^ "File types supported by Windows Media Player". Microsoft. Retrieved 2020-07-25.
  14. ^ "What's New in QuickTime 6.3 + 3GPP". Apple, Inc. Retrieved 2020-07-25.
  15. ^ "VLC Media Player features". VLC. Retrieved 2020-07-25.
  16. ^ "FFmpeg, General Documentation, Supported File Formats and Codecs". FFmpeg. Retrieved 2009-06-11.

External links


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