Bugs item #3388263, was opened at 2011-08-08 12:58
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Category: RTSP
Group: wrong behaviour
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Tinus van den Berg (tinusvdb)
Assigned to: Daniel Stenberg (bagder)
Summary: Independant RTSP connections

Initial Comment:
Background:
Assume UDP streaming... Some RTSP servers require a dedicated RTSP connection for every streaming session. This RTSP connection must stay alive for the duration of streaming, and keep alive (OPTIONS/GET_PARAMETER) messages might be sent periodically. If the connection is closed or keep-alive has not been received ,udp streaming will be stopped.

Problem:
We make use of the multi-interface and have a curl handle per stream. When trying to start multiple streams Curl tries to re-use the connection that the first stream creates to start the other streams. The result is that the RTSP server is in an invalid state as it is being bombarded with RTSP requests from different stream requests, and the RTSP session fails for all streams.

What we tried:
We tried to set CURLOPT_FRESH_CONNECT during an OPTIONS request to try force a new connection for each stream/curl handle. The result is that curl creates 3 connections which at first seems correct, BUT, these connections are not tied to the curl handle that requested them, so the Curl multi manager basically uses whichever connection it thinks is free to be used and all hell breaks loose again. Server in wrong states etc.

Question:
Is it possible to provide way to specify that a connection that was created by a specific curl handle should only be used for that curl handle. This way we can have a Fresh connection per session, that is tied to the curl handle, and can only be used by that curl handle. We can then also use CURL_FORBID_REUSE on a Teardown request to close the connection related to a RTSP session when we want to stop streaming.

Hope this makes sense, any help would be appreciated.

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Received on 2011-08-08