- From: Philipp Hoschka <Philipp.Hoschka@sophia.inria.fr>
- Date: Tue, 09 Dec 1997 18:30:43 +0100
- To: www-multimedia@w3.org
- cc: sakata@pccrd.fc.nec.co.jp
>I would like to ask you about the very basic question, the relation
>between SMIL and RTSP.
RTSP is a protocol that allows the control of "streaming" multimedia
transmissions (i.e. transmissions that use UDP instead of using TCP
like http).
An important use of SMIL is the integration of audio/video
parts into a multimedia presentation. Since it is common to "stream"
this type of media types, it seems very likely that SMIL players will
implement RTSP.
That being said, it is entirely legal to implement a SMIL player
without implementing RTSP. However, such a player will probably be
unable to play "typical" SMIL documents.
>Otherwise, is RTSP used exclusively from SMIL?
A SMIL player can use both RTSP and HTTP. For example, the following
SMIL document would retrieve an image via http, display it, and
play an audio in parallel, which is retrieved using rtsp:
<smil>
<body>
<par>
<seq>
<img href="http://www.w3.org/palmtree.gif" dur="5s"/>
<img href="http://www.w3.org/sunset.gif" dur="2s"/>
</seq>
<audio href="rtsp://www.w3.org/audio.au"/>
</par>
</body>
</smil>
Hope this helps
-Philipp
Received on Tuesday, 9 December 1997 12:31:03 UTC