I actually ran into this very same problem a while back. We had a
customer trying to stream live low frame rate/low bit rate video over a
slow military 3G cellular network and things weren't working, I can't
remember all the details now but either the client or the server was
hanging up because of an unexpected response or something like that. It
wasn't crashing but things also weren't operational.
Eventually I figured out the same thing that Ralf discovered, i.e. that
one of the RTCP packets were coming in before the server expected and
messing up the server RTSP over TCP parsing code. I have to go back and
reproduce the problem to be sure, but I think it was more than a mere
annoyance.
At the time the customer figured out a work around (I think it was a
different network or something like that ) and I didn't have time to
figure out a proper fix for the code and I put it on my to do list to
report the problem to you Ross. But as often happens with to do lists
that item never came up.
A fix for this would be appreciated.
Matt S.
On 8/30/2012 6:44 AM, Ross Finlayson wrote:
1) The server could of course be made more robust by detecting the
'$' char and ignoring such requests.
Would this work as a quick fix?
Perhaps. But is this really a problem worth worrying about? If this
happens only occasionally (in extreme situations), and merely causes
the server to send back a "method not allowed" RTSP response, then is
this a major problem? It seems to be merely an 'annoyance'.
2) The (more correct?) approach would be to only allow the client to
send an RR after it has received a PLAY response.
Maybe, but that would require a major change to the client code that
might break other things - and wouldn't help with existing clients
anyway. So I'm not going to go down that route just to deal with a
rare issue that - as noted above - appears to be just an annoyance.
Ross Finlayson
Live Networks, Inc.
http://www.live555.com/
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