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AMR AMR (Audio)

File extension .amr
Category Audio 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.
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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

MP4 MP4 (Video)

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.
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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

AMR Convert AMR file

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

  • amr to aac (Advanced Audio Coding File)
  • amr to ac3 (AC3 Audio File)
  • amr to flac (Free Lossless Audio Codec)
  • amr to m4a (Compressed video file)
  • amr to mp3 (Compressed audio file)
  • amr to mp4 (MPEG-4 Video File)
  • amr to ogg (Ogg Vorbis Compressed Audio File)
  • amr to wav (Windows audio file)
  • amr to wma (Windows Media Audio)

AMR to MP4 - Convert file now

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