Subject: Re: [MMUSIC] reason for teardown

From: [email-masked]
Date: Thu, 3 Jul 2003 18:10:45 +0200

Magnus you wrote:

> There is no explicit indication on that a clip is over.

there is RTCP "BYE" ;-)

regards,

Philippe Gentric
Software Architect
Philips MP4Net
[email-masked]
http://www.platform4.philips.com

                                                                                                                                           
                                                       To:   Saurabh Srivastava <[email-masked]>                                  
                                                       cc:   [email-masked]                                                               
                                                        (bcc: Philippe Gentric/MP4-SUR/CE/PHILIPS)                                         
                                                       Subject:    Re: [MMUSIC] reason for teardown                                        
               Magnus Westerlund                                                                                                           
               <magnus.westerlund@ericsson.            Classification:                                                                     
               com>                                                                                                                        
                                                                                                                                           
               Sent by:                                                                                                                    
               [email-masked]                                                                                                       
                                                                                                                                           
               03/07/2003 17:14                                                                                                            

Hi,

Do I understand you correctly that you would like to have some
indication on why the client performed the TEARDOWN? If not can you
please be more clear about what you desire.

I would also like to to point out certain things in your mail.

Saurabh Srivastava wrote:
> Hi Folks,
>       This is a requirement that would enable the streaming server to
> know that why a session is being closed from client and in turn, allow
> it to give guaranteed delivery service in pay-per-view scenarios.
>
> TEARDOWN, which indiactes the end of the session can be sent from a
> client due to:-
> 1. The RTP channel indicating that the clip is over.

There is no explicit indication on that a clip is over. In streaming
this is normally resolved at the client when it notices that the
full-range has been played out. The client may also detect that delivery
has stopped of RTP packets. To verify that this is not due to transport
errors the client should look at the RTCP SR. However this method does
not guarantee that a clip is really over, and not simply a part where no
packets are delivered. For Live content this is basically very difficult
unless other means indicate that the session has expired.

On possibility in RTSP to notify clients that the session is really over
is to redirect the client to such a message. Introducing the message in
the session for live content is also useful, at least for the user.

Normally the client will issue a TEARDOWN in this case when the user
does not rewind the session or otherwise inactive for some period of
time. In other words, the end of the clip does not automatically lead to
a TEARDOWN request.

> 2. The user initiating the request to end the session.

Which is the case you receive a TEARDOWN.

> 3. Network problem due to which the client gets time-out.

In this case there will be no TEARDOWN request. The server side simply
times out the session.

Best Regards

Magnus Westerlund

Multimedia Technologies, Ericsson Research EAB/TVA/A
----------------------------------------------------------------------
Ericsson AB                | Phone +46 8 4048287
Torshamsgatan 23           | Fax   +46 8 7575550
S-164 80 Stockholm, Sweden | mailto: [email-masked]

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