For the storage of H.263 and AMR content 3G2 specification refers to the 3GP file format specification.
#3G2 SAMPLE FILE MP4#
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. 3G2 file format does not store Enhanced aacPlus (HE-AAC v2) and AMR-WB+ audio streams. The 3G2 specification also defined some enhancements to 3GPP Timed Text. In addition, 3G2 stores audio streams as EVRC, EVRC-B, EVRC-WB, 13K ( QCELP), SMV or VMR-WB, which was specified by 3GPP2 for use in ISO base media file format. The 3G2 file format can store the same video streams and most of the audio streams used in the 2007 3GP file format. Ī 3GP file is always big-endian, storing and transferring the most significant bytes first.
The MP4 and the AVC file format specifications described usage of MPEG-4 content in the ISO base media file format. įor the storage of MPEG-4 media specific information in 3GP files, the 3GP specification refers to MP4 and the AVCįile format, which are also based on the ISO base media file format.
#3G2 SAMPLE FILE REGISTRATION#
These extensions were registered by the registration authority for code-points in ISO base media file format ("MP4 Family" files). 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. The 3GP file format stores video streams as MPEG-4 Part 2, H.263, or MPEG-4 Part 10 (AVC/H.264), and audio streams as AMR-NB, AMR-WB, AMR-WB+, AAC-LC, HE-AAC v1 or Enhanced aacPlus (HE-AAC v2). 3GPP2 file format was designed for CDMA-based phones and may have the filename extension.3GPP file format was designed for GSM-based phones and may have the filename extension.They are good for lower end smartphones for faster streaming & download.ģGP and 3G2 are similar standards, but with some differences: The 3GP and 3G2 file format were designed to decrease storage and bandwidth requirements to accommodate mobile phones. 3GP and 3G2 are container formats similar to MPEG-4 Part 14 (MP4), which is also based on MPEG-4 Part 12. The 3GP and 3G2 file formats are both structurally based on the ISO base media file format defined in ISO/ IEC 14496-12 – MPEG-4 Part 12, but older versions of the 3GP file format did not use some of its features. Based on the 3GPP2 technical specification published on. Relations between ISO Base Media File Format, MP4 File Format, 3GPP file format and 3GPP2 file format.
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