AMR to MP4

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

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File extension	.amr
Category	Music File
Description	The Adaptive Multi-Rate format was specifically designed for speech coding. Many phone providers use the AMR format to store short audio recordings but shouldn't really be used to store other audio such as music due to it's design. In 1999 AMR was adopted as the chosen speech standard for 3GPP. The AMR file is often converted into other formats to allow for use and ease of distribution.
Actions	*AMR to MP4* - Convert file now View other music file formats
Technical Details	The AMR codec uses eight source codecs with bit-rates of 12.2, 10.2, 7.95, 7.40, 6.70, 5.90, 5.15 and 4.75 kbit/s and has a sampling frequency of 8kHz which is filtered to 200-3400 Hz. The AMR algorithm utilises link adaptation in order to be utilised with radio channel and capacity requirements.
Associated programs	Apple QuickTime Realplayer VLC media Player Winamp
Developed by	3rd Generation Partnership Project (3GPP)
MIME type	audio/amr
Useful links	Further information on Multi-rate audio files What is an AMR file ? Convert AMR file

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	Convert MP4 file 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

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

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