RealMedia
{{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{{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}}
| 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 =
= 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
{{Multimedia-software-stub}}