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--></style><title>Re: [Live-devel] Questions of
bitrate</title></head><body>
<blockquote type="cite" cite><font face="Verdana" size="-1">Hi,
everyone</font></blockquote>
<blockquote type="cite" cite><font face="Verdana"
size="-1"> I have questions about RTP
bitrate.</font></blockquote>
<blockquote type="cite" cite><font face="Verdana"
size="-1"> 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?</font></blockquote>
<div><br></div>
<div>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).</div>
<div><br></div>
<blockquote type="cite" cite><font face="Verdana"
size="-1"> 2.In every ServerMediaSubSession
there is a estBitrate. What does it work
for?</font></blockquote>
<div><font face="Verdana" size="-1"><br></font></div>
<div>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.)</div>
<x-sigsep><pre>--
</pre></x-sigsep>
<div><br>
Ross Finlayson<br>
Live Networks, Inc.<br>
http://www.live555.com/</div>
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