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RealMedia is a proprietary multimedia container format created by RealNetworks with the filename extension .rm. RealMedia is generally used in conjunction with RealVideo and RealAudio , while also being used for streaming content over the Internet. Typically these streams are in CBR ( constant bitrate ), but a container for VBR ( variable bitrate ) streams named RMVB (RealMedia variable bitrate) has been developed.

Overview [ edit ]

A RealMedia file consists of a series of chunks that can be of several different types:

• .RMF : RealMedia file header
• PROP : File properties header
• MDPR : Media properties header
• CONT : Content description header
• DATA : Data header
• INDX : Index header

Supported audio formats [ edit ]

• RealAudio 1.0 (VSELP), IpcJ
• RealAudio 2.0 (LD-CELP), 28_8
• AC3 , dnet
• Sipro , sipr
• cook , cook
• ATRAC3 , atrc
• RealAudio Lossless Format, ralf
• LC-AAC , raac
• HE-AAC , racp

Supported video formats [ edit ]

• ClearVideo (from helix spec)
• H.263 , RV10
• H.263, RV13
• H.263+ , RV20
• H.264 precursor, RV30
• H.264 precursor, RV40
• H.263+ (RV20), RVTR

See also [ edit ]

• RealPlayer
• Container format
• Comparison of video container formats
• Comparison of video player software
• RealVideo codecs
• RealAudio codecs
• Helix Community - the free and open source software project from RealNetworks

References [ edit ]

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