3GP is the MPEG4 based video format used mostly in mobile terminals, such as mobile phones. This file format is designed for 3rd generation mobile devices.
3GPP is defined by the 3rd Generation Partnership Project and 3GPP is defined by 3rd Generation Partnership Project 2. They are the worldwide standards for the creation, delivery and playback of multimedia over 3rd generation. These standards seek to provide uniform delivery of rich multimedia over newly evolved, broadband mobile networks (3rd generation networks) to the latest multimedia-enabled wireless devices, such as cell phones.
3gp is a file format which is used in mobile phones to store media (audio/video). This file format is a simpler version of "ISO 14496-1 Media Format". MOV (used by QuickTime) is also a format which follows similar file format. This format can only carry video encoded as MPEG-4 or H.263. Audio is stored in AMR-NB or AAC-LC formats.
In this format, values are stored as big-endian.
3GPP also describes image sizes and bandwidth, so content is correctly sized for mobile display screens.
The current 3GPP version is release 5, offering the most standardized feature set for encoding, distribution and playback.
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