MP4 to 3GP

Convert MP4 to 3GP - online and free - this page also contains information on the MP4 and 3GP file extensions.

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File extension	.mp4
Category	Video File
Description	MP4 files (MPEG-4 Part 14) are multimedia files. MP4 is a container format that can store video, audio and subtitle data (as well as more depending on content). Since stores like iTunes uses this container format, and it is used with iPod and PlayStation Portable (PSP), MP4 files have become more common.
Actions	*MP4 to 3GP* - Convert file now View other video file formats
Technical Details	MPEG-4 Part 14 or MP4, formally ISO/IEC 14496-14:2003, is a multimedia container format standard specified as a part of MPEG-4. It is most commonly used to store digital video and digital audio streams, especially those defined by MPEG, but can also be used to store other data such as subtitles and still images. Like most modern container formats, MPEG-4 Part 14 allows streaming over the Internet. A separate hint track is used to include streaming information in the file. The only official filename extension for MPEG-4 Part 14 files is .mp4.
Associated programs	Apple QuickTime Player Apple iTunes Microsoft Windows Media Player VideoLAN VLC Media Player
Developed by	Moving Picture Experts Group
MIME type	audio/mpeg
Useful links	Detailed information on the MP4 File Format How to play MP4 files Convert MP4 file

File extension	.3gp
Category	Video File
Description	3GP is a file format designed for video on mobile phones. 3GP is a container that facilitates the creation, editing, transfer and viewing of video and audio using a 3G mobile phone. It is supported by most smartphones, including the Apple iPhone.
Actions	Convert 3GP file View other video file formats
Technical Details	3GP is based on the structure of MPEG-4 Part 14, otherwise known as MP4. 3GP was designed to reduce the overhead in terms of storage and bandwidth to allow video files that could be handled by smartphones.
Associated programs	QuickTime Player VLC Media Player Windows Media Player
Developed by	3rd Generation Partnership Project (3GPP)
MIME type	video/3gpp audio/3gpp
Useful links	More Information on 3GP Official Specification from 3GPP Organisation Convert 3GP file

Using Zamzar it is possible to convert MP4 files to a variety of other formats

MP4 to 3GP - Convert file now