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RealMedia

RealMedia is a multimedia container format created by RealNetworks. Its extension is ".rm". It is typically used in conjunction with RealVideo and RealAudio and is popular for streaming content over the Internet. Typically these streams are in CBR (constant bit rate). Recently RealNetworks has developed a new container for VBR (variable bit rate) streams, named RealMedia variable bitrate (RMVB). Support of RealMedia is available in a wide variety of multimedia players for different architectures/platforms, including RealPlayer. Launched in 2002, the Helix initiative includes plan to release substantial parts of proprietary technologies under an open source licence. RealNetworks also announced partnership with Xiph.org to support the free software Ogg Vorbis audio codec. The code is released under various licenses, like the RealNetworks Public Source License starting in 2003 and the GPL in 2004. Not all of the source code is licensed under one of the free software licences, for example the codecs (see : https://helixcommunity.org).