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

Overview

Supported audio formats

Supported video formats

See also