RM is short for RealMedia. It is a proprietary multimedia container format created by RealNetworks. And recently, RealNetworks has developed a new container for VBR (variable bitrate) streams, named RMVB (RealMedia variable bitrate).
RM is typically used in conjunction with RealVideo and RealAudio and is used for streaming content over the Internet. And support of RealMedia is available in a wide variety of multimedia players for different architectures/platforms, including RealPlayer and the Real Alternative codec pack. The open source DAP firmware Rockbox has added support for reading RM containers as of 6 July 2009, although only certain codecs contained in RM files are playable.
Video Converter Factory Pro is the professional software for video converting. The software supports about 150 video formats, and RM is also included. The converter provides fast converting speed and good image quality during the RM video converting process. Besides it is easy to use. It's a nice converter.
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