[Live-devel] Questions of bitrate

[Ross Finlayson]

>Hi, everyone
>      I have questions about RTP bitrate.
>      1.In OpenRTSP, we can calculate the QOS out which includes the 
>bitrate. But I wonder can I reduce or increase the bitrate by 
>controlling the server?

No, not at present.  RFC 4585 does define a new RTP profile - 
"RTP/AVPF" - that modifies the original "RTP/AVP" profile to add 
support for special RTCP 'feedback' packets (from the client back to 
the server) that the server might use to adapt its behavior. 
However, we do not currently implement this profile (for either 
clients or servers).

>      2.In every ServerMediaSubSession there is a estBitrate. What 
>does it work for?

It's used by the RTCP implementation to estimate how often to send 
RTCP packets.  (According to the RTP/RTCP specification, RTCP packets 
are not supposed to take up more than 5% of the total bitrate.)
-- 

Ross Finlayson
Live Networks, Inc.
http://www.live555.com/
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