RealMedia
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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
- cook, cook
- 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
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