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What is Windows Media Format?
Windows Media Format is a proprietary format designed
primarily for streaming audio, video and text from Internet servers
to client computers. A Windows Media file can also be stored and
played locally. Each Windows Media file contains one or more media
streams that together form a multimedia presentation. Stream delivery
is synchronized to a common timeline. The following list presents
the key features of Windows Media Format:
 A Windows Media
file can be transported over any underlying data communication
transport protocol. Windows Media Format does not specify the
format of data packets for different network protocols.
Windows Media
Format is scalable to any bandwidth. A single input stream can
be encoded into multiple output streams within a single Windows
Media file. Each scaled stream differs by the bit rate at which
it can be rendered, and only one can be rendered at a time. The
Windows Media server uses intelligent streaming to send the highest
quality stream a client is capable of receiving.
The delivery
and presentation of multiple media streams is synchronized to
a common timeline. The media data inside a Windows Media file
is time-stamped.
A Windows Media
file can contain one video, one audio and one script stream.
A client does
not need to store Windows Media-based content to play a multimedia
stream.
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