停止Live555重新使用會話

我使用Live555從遠程連接上的IP攝像頭提取數據。有時會有短暫的中斷（這可能是網絡QOS問題），但是，每次發生這種情況而不是成功地重新啓動連接時，live555都會死亡。調試輸出是這樣的：停止Live555重新使用會話

Closing session, because we stopped receiving packets.itrate=N/A speed=1.37x 
Created new TCP socket 3 for connection 
Connecting to 10.8.1.14, port 10111 on socket 3... 
...remote connection opened 
Sending request: PLAY rtsp://mycamera.test/live/ch0/ RTSP/1.0 
CSeq: 6 
User-Agent: /bin/openRTSP (LIVE555 Streaming Media v2017.07.18) 
Session: 1487641045855494467 
Range: npt=0.000- 

Received 199 new bytes of response data. 
Received a complete PLAY response: 
RTSP/1.0 500 Internal Server Error 
Server: DSS/6.0.3 (Build/526.3; Platform/Linux; Release/Darwin Streaming Server; State/Development;) 
Cseq: 6 
Session: 1487641045855494467 
Connection: Close 

Failed to start playing session: 500 Internal Server Error 
Created new TCP socket 3 for connection 
Connecting to 10.8.1.14, port 10111 on socket 3... 
...remote connection opened 
Sending request: TEARDOWN rtsp://mycamera.test/live/ch0/ RTSP/1.0 
CSeq: 7 
User-Agent: /bin/openRTSP (LIVE555 Streaming Media v2017.07.18) 
Session: 1487641045855494467 

Received 180 new bytes of response data. 
Received a complete TEARDOWN response: 
RTSP/1.0 200 OK 
Server: DSS/6.0.3 (Build/526.3; Platform/Linux; Release/Darwin Streaming Server; State/Development;) 
Cseq: 7 
Session: 1487641045855494467 
Connection: Close

這似乎是live555是原因撈出是因爲相機試圖重新啓動流爲現有會話時拋出一個500錯誤。既然開始一個新的會話有效，有沒有什麼辦法可以告訴live555放棄現有的會話並重新開始，而不是放棄？我有一個cron作業，可以檢測live555何時停止並重新啓動它，但是當我這樣做時會出現問題，因此如果我能夠說服live555來彌補相機固件中的錯誤，它會更加乾淨。

我很高興修補live555代碼，並在必要時重建！

來源

2017-10-18 Tim W

如果你看的playCommon.cpp代碼，你可以看到

void sessionAfterPlaying(void* /*clientData*/) { 
    if (!playContinuously) { 
    shutdown(0); 
    } else { 
    // We've been asked to play the stream(s) over again. 
    // First, reset state from the current session: 
    if (env != NULL) { 
     env->taskScheduler().unscheduleDelayedTask(periodicFileOutputTask); 
     env->taskScheduler().unscheduleDelayedTask(sessionTimerTask); 
     env->taskScheduler().unscheduleDelayedTask(arrivalCheckTimerTask); 
     env->taskScheduler().unscheduleDelayedTask(interPacketGapCheckTimerTask); 
     env->taskScheduler().unscheduleDelayedTask(qosMeasurementTimerTask); 
    } 
    totNumPacketsReceived = ~0; 

    startPlayingSession(session, initialSeekTime, endTime, scale, continueAfterPLAY); 
    } 
}

，正如你在日誌中看到，它發送播放和亙古不變的重新發起會話。爲了改變這種行爲，你需要修改openRTSP的代碼。

來源

2017-10-21 13:52:49 mpromonet

停止Live555重新使用會話

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