What is m4r?
A M4R extension is the extension given to a ringtone file, created for the iPhone by Apple Inc. Basically, a M4R file is just a M4A file that has been renamed. All music files can be converted to an iPhoe ringtone by renaming a music clip of maximum 30 second length to .M4R. Import the M4R to iTunes and sync the playlist with your iPhone.
What is m4a?
A M4A format, short for MPEG-4 Audio, is an audio layer file that is the audio layer of MPEG-4 movies. It is ready to become the world’s new standard for the compression of audio files. The M4A format is also used by Apple as a lossless file or lossless encoder.
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