[Live-devel] testRTSPClient loses sink context when receiving from multiple RTSP clients

[Jonathan Lucas]

Hi Ross,

Thanks for the very detailed response. I have downloaded the latest version of the library (with the same results) and will contact the manufacturer with the details you provide, although I suspect getting the firmware changed is going to be difficult. 

However, I'm surprised that the live555 library cannot cope with this: surely it's possible to separate the two streams even though they are arriving on the same ports: surely after the socket is bound to the port, it can specify the source address of the camera using connect()? This would allow packets from each camera to be filtered into separate receive buffers.

Best Regards,

Jonathan

> On 26 Oct 2016, at 19:00, Ross Finlayson <finlayson at live555.com> wrote:
> 
> First, please upgrade to the latest version of the “LIVE555 Streaming Media” source code (the only version that we support); see
>    http://live555.com/liveMedia/faq.html#latest-version
> 
> Your problem, however, is with your RTSP servers - i.e., your cameras.  Specifically: In their RTSP “DESCRIBE” responses, your servers each specify that they will be streaming only to port number 5004.  I.e.,
> 
>> m=video 5004 RTP/AVP 26
> 
> Because *both* of your cameras do this, they *both* send RTP packets to port number 5004 (and both send RTCP packets to port number 5005).  Therefore, your RTSP client (“testRTSPClient”) cannot distinguish between the two streams.
> 
> Specifying a non-zero port number in a SDP “m=” line is usually done only when the stream is multicast.  For unicast streams like this, it is more common for the server to put “0” as the port number in the “m=“ line.  This tells the client that it should choose its own, ephemeral, port number for each stream, which it will put in its subsequent RTSP “SETUP” command - to tell the server which port to stream to.
> 
> So, please tell your camera manufacturer (Point Grey) about this bug.  If they don’t fix this bug - or if you can’t reconfigure your cameras to use different static client port numbers - then you won’t be able to use more than one of these cameras when streaming to the same client host.
> 
> Finally, you should note that streaming JPEG is generally a bad idea; see
>    http://live555.com/liveMedia/faq.html#jpeg-streaming
> 
> 
> Ross Finlayson
> Live Networks, Inc.
> http://www.live555.com/
> 
> 
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