{{Short description|Digital file format}} {{More sources needed|date=December 2009}} {{Infobox file format | name = RealMedia | icon = | extension = .rm, .rma, .rmi, .rmv, .rmvb, .rmhd, .rmm, .ra, .ram | mime = | type code = | uniform type = com.real.realmedia<ref>{{cite web |url=https://developer.apple.com/library/archive/documentation/Miscellaneous/Reference/UTIRef/Articles/System-DeclaredUniformTypeIdentifiers.html |title=System-Declared Uniform Type Identifiers |work=Uniform Type Identifiers Reference |publisher=Apple Inc}}</ref> | owner = RealNetworks | type = Container format | container for = | contained by = | extended from = | extended to = | standard = | free = No | open = No }}
'''RealMedia''' is a proprietary multimedia container format created by RealNetworks with the filename extension {{Not a typo|.rm}}. 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), {{Not a typo|IpcJ}} * RealAudio 2.0 (LD-CELP), 28_8 * AC3, {{Not a typo|dnet}} * Sipro, {{Not a typo|sipr}} * cook, cook * ATRAC3, {{Not a typo|atrc}} * RealAudio Lossless Format, {{Not a typo|ralf}} * LC-AAC, {{Not a typo|raac}} * HE-AAC, {{Not a typo|racp}}
=== 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== {{Reflist}}
{{Compression formats}}
{{DEFAULTSORT:Realmedia}} Category:Digital container formats Media
{{Multimedia-software-stub}}