RM

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RM is an extension for ReadMedia files. They can be either video or audio. Also .RA (Read Audio) and RMVB RealMedia Variable Bitrate.

[edit] Overview

These are proprietary container formats created by Real Networks. They are intended and used for Internet streaming. An RM file has a constant bitrate while RMVB has a variable bitrate. RA was the original audio file format but the extension is seldom used anymore.

See Wiki Multimedia for information on the internal format of these files.

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