M4V to AMR - Convert audio online
|#||Output File||Source File||Action|
1. Click "Choose Files" button to select multiple files on your computer or click the dropdown button to choose online file from URL, Google Drive or Dropbox. The source file can also be video format. Video and audio file size can be up to 200M. You can use file analyzer to get source audio's detailed information such as track name, genre, bitrate and sampling rate etc.
3. Click "Convert Now!" button to start batch conversion. It will automatically retry another server if one failed, please be patient while converting. The output files will be listed in the "Conversion Results" section. Click icon to show file QR code or save file to online storage services such as Google Drive or Dropbox.
M4V vs AMR:
|Full name||Raw MPEG-4||Adaptive Multi-Rate|
|File extension||.m4v||.amr, .3ga|
|Developed by||Apple Inc.||3GPP|
|Type of format||Video container||Audio compression format|
|Introduction||The M4V file format is a video container format developed by Apple and is very similar to the MP4 format. The primary difference is that M4V files may optionally be protected by DRM copy protection. Apple uses M4V to encode video files in its iTunes Store.||The Adaptive Multi-Rate (AMR or AMR-NB or GSM-AMR) audio codec is an audio compression format optimized for speech coding. AMR was adopted as the standard speech codec by 3GPP in October 1999 and is now widely used in GSM and UMTS.|
|Technical details||Unauthorized reproduction of M4V files may be prevented using Apple's FairPlay copy protection. A FairPlay-protected M4V file can only be played on a computer authorized (using iTunes) with the account that was used to purchase the video.||AMR speech codec consists of a multi-rate narrowband speech codec that encodes narrowband (200-3400 Hz) signals at variable bit rates ranging from 4.75 to 12.2 kbit/s with toll quality speech starting at 7.4 kbit/s. Sampling frequency 8 kHz/13-bit (160 samples for 20 ms frames), filtered to 200-3400 Hz.|
|Associated programs||Apple iTunes, Apple QuickTime Player, Media Player Classic, K-Multimedia Player, RealPlayer, Zoom Player, VLC media player||Audacity, FFmpeg, MPlayer, QuickTime, VLC media player|
|Wikipedia||M4V on Wikipedia||AMR on Wikipedia|