As we all known, iTunes movies you purchased or rented from iTunes Store are M4V files with Apple DRM protection. If you want to get AMR audio files from those M4V videos, DRM should be removed firstly.
It is very simple to remove DRM from iTunes movies and convert M4V to AMR using M4V Converter for Mac. It is a professional M4V to AMR Converter which can help you to extract AMR audio files from iTunes M4V movies. The following guide is mainly to tell users to convert M4V to AMR on Mac. If you use a windows, you can refer to Windows version tutorial here.
Download the M4V to AMR Converter for Mac, install and run it. Click the "Add Movies" button to find the M4V files you want to convert from iTunes library, then hit "Add".
After the M4V files are added, go to "Convert to" profile panel, find gear section and choose "AMR Audio" as output format.
After all settings done, click "Convert" button on the lower left corner of the screen. When the conversion is done, you can find the converted AMR files by hitting the "Converted Moives" option.
Adaptive Multi-Rate audio codec (AMR) is an audio compression format optimized for speech coding. AMR is also a file format for storing spoken audio using the AMR codec. The common filename extension is .amr. AMR uses various techniques, such as ACELP, DTX, VAD and CNG. It adopted in October 1998 as the standard speech codec by 3GPP (3d Generation Partnership Project) and now widely used in GSM (Global System for Mobile Communications).
