RealMedia is a proprietary multimedia container format created by RealNetworks with the filename extension . 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), RealAudio 2.0 (LD-CELP), 28_8 AC3, Sipro, cook, cook ATRAC3, RealAudio Lossless Format, LC-AAC, HE-AAC,
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