Re: [AVT] Video streaming withour RTCP

[Magnus Westerlund <[e-mail]>]

Jaehwan Kim skrev:
> 
> 
> Hi,
> 
> And could you explain more in detail?
> 
> I would appreciate if you give us an example.
> 
>  
> 
> If there is a common misconception happening again and again, IMO, the 
> notion with enough examples should be into RTSP specification.

Okay, we will log a request to clarify that RTP-Info only provides for 
initial sync and that RTCP is needed for maintaining sync in the case of 
clock drift. But there is much more on timestamp handling in 
http://tools.ietf.org/html/draft-ietf-mmusic-rfc2326bis-14
than what is in RFC 2326.

I could also recommend looking at the How To write RTP payload formats 
that has some discussion on the RTCP synch mechanism or Colin Perkins 
book on RTP.
http://tools.ietf.org/html/draft-ietf-avt-rtp-howto-01

There is also need to have RTCP for synch in cases such as multiple 
sources (SSRCs) and live sessions. In addition RTCP is needed for its 
transport monitoring purpose. The sender can't do any type of adaptation 
or avoid causing long term congestion unless RTCP is used.

Cheers

Magnus Westerlund

IETF Transport Area Director & TSVWG Chair
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