RealMedia
RealMedia (sometimes called RMFF) is a multimedia container format associated with the RealVideo/RealAudio/RealPlayer ecosystem.
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Disambiguation
The extent to which RealMedia is the official name is not clear. It is used in the MIME type, but seems to be avoided in most documentation.
In practice, RealMedia can mean just the (newer) format with signature ".RMF", or it can be expanded to also encompass the older audio-only RealAudio format with signature ".ra". This article is mainly about the newer format. For the older format, see RealAudio.
If a file contains video, it is said to be in RealVideo format (a term that may also encompass other things, such as some codecs). A file that contains only audio is said to be in RealAudio format (a term that also encompasses other things, including the older RealAudio format, and some codecs).
There is also a thing named RealMedia HD, which is probably just a codec, not a file format.
See also
Identification
Files begin with ASCII ".RMF".
