3G2(3GPP2 file format) is a multimedia container format similar to the 3GP file format. 3G2 is defined by the Third Generation Partnership Project 2 (3GPP2) for 3G CDMA2000 multimedia services. 3G2 files are stored with the .3g2 extension. As compared to 3GP files, 3G2 files consume less space and bandwidth.
The 3G2 format is based on the ISO base media file format defined in ISO/IEC 14496-12 – MPEG-4 Part 12. 3G2 file format was developed for mobile phones to reduce storage, bandwidth, and data usage. 3G2 file format supports the following codecs:
MPEG-4 Part 2
MPEG-4 Part 10 (AVC/H.264)
For the storage of MPEG-4 content, 3G2 refers to the MP4 and AVC specifications, and for the storage of H.263 and AMR content, it refers to the 3GP specifications.