RM is video container format which is used in conjunction with the program RealPlayer. The format contains audio or video data or a link to a streaming media file. RM is commonly used for streaming content over the Internet and is therefore very important for Internet radio and Internet videos.
M4A is an audio file format that is very similar to MP4. It is a proprietary file format of Apple. iTunes store contains the audios as M4A format. It uses MPEG-4 codec to contain audio files. One of the basic differences between M4A and MP4 is M4A does not contain videos like MP4.
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