WMA to M4A
M4P to M4A
MP4 to M4A
AAC to M4A
RAX to M4A
AA to M4A
Convert M4P to M4A - M4P to M4A Converter
To use DRM Converter - DRM Remover Software as M4P to M4A converter, select MPEG4 AAC from "Encoder" drop-down list and set a desired MPEG4 AAC quality parameter in "Compression Quality" drop-down list in DRM Converter's Settings. Select M4P files for conversion using the "Select Files" button in DRM Converter's main window toolbar (you can use Ctrl or Shift to select two or more files) or using drag&drop (for example from the Windows Explorer). Also you can drag&drop a folder with files or a folder structure. You will see all selected M4P files in the DRM Converter's main window. To delete a M4P file from this list, select it and click on the "Delete" button in DRM Converter's main window toolbar. Once the M4P files are present in your list, click the "Convert" button to convert M4P to M4A.
Since MPEG-4 is a container format, MP4 files may contain any number of audio, video, and even subtitle streams, making it impossible to determine the type of streams in an MP4 file based on its filename extension alone. In response, Apple Inc. started using and popularizing the M4A file extension using for audio-only MP4 files.
MP4 files with audio streams encrypted by FairPlay Digital Rights Management (DRM) as sold through the iTunes Store use the M4P extension.