RealMedia

RealMedia is a proprietary multimedia container format created by RealNetworks with the filename extension Template:Not a typo. RealMedia is 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

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

• RealAudio 1.0 (VSELP), Template:Not a typo
• RealAudio 2.0 (LD-CELP), 28_8
• AC3, Template:Not a typo
• Sipro, Template:Not a typo
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• ATRAC3, Template:Not a typo
• RealAudio Lossless Format, Template:Not a typo
• LC-AAC, Template:Not a typo
• HE-AAC, Template:Not a typo

Supported video formats

• 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
• H.265, RMHD

See also

• 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

Template:Multimedia-software-stub