RealMedia is a proprietary
multimedia
Multimedia is a form of communication that uses a combination of different content forms such as text, audio, images, animations, or video into a single interactive presentation, in contrast to tradit ...
container format created by
RealNetworks
RealNetworks, Inc. is a provider of artificial intelligence and computer vision based products. RealNetworks was a pioneer in Internet streaming software and services. They are based in Seattle, Washington, United States. The company also pr ...
with the
filename extension
A filename extension, file name extension or file extension is a suffix to the name of a computer file (e.g., .txt, .docx, .md). The extension indicates a characteristic of the file contents or its intended use. A filename extension is typically ...
. RealMedia is generally used in conjunction with
RealVideo and
RealAudio
RealAudio, or also spelled as Real Audio is a proprietary audio format developed by RealNetworks and first released in April 1995. It uses a variety of audio codecs, ranging from low-bitrate formats that can be used over dialup modems, to high-fi ...
, while also being used for
streaming
Streaming media is multimedia that is delivered and consumed in a continuous manner from a source, with little or no intermediate storage in network elements. ''Streaming'' refers to the delivery method of content, rather than the content i ...
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 (RMVB) is a variable bitrate extension of the RealMedia multimedia digital container format developed by RealNetworks.
As opposed to the more common RealMedia container, which holds streaming media encoded at a consta ...
(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,
*
* 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
See also
*
RealPlayer
*
Container format
*
Comparison of video container formats
*
Comparison of video player software
*
RealVideo codecs
*
RealAudio
RealAudio, or also spelled as Real Audio is a proprietary audio format developed by RealNetworks and first released in April 1995. It uses a variety of audio codecs, ranging from low-bitrate formats that can be used over dialup modems, to high-fi ...
codecs
*
Helix Community - the free and open source software project from
RealNetworks
RealNetworks, Inc. is a provider of artificial intelligence and computer vision based products. RealNetworks was a pioneer in Internet streaming software and services. They are based in Seattle, Washington, United States. The company also pr ...
Digital container formats
Media
{{Multimedia-software-stub