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• Ignore Connection Error on Multiple Rtsp Stream in FFmpeg

  17 décembre 2022, par Onur Külekci

  Sorry for my bad English. My problem is ;
ffmpeg command closes completely when one of the streams cannot be reached while multicasting. when it can't reach a single rtsp address, how can it ignore it and continue broadcasting from the others ?

  


  Example ;

  


  ffmpeg -i rtsp://5.63.151.4:443/atv/atv2 -map 0 c:\atv.flv -i rtsp://live.sabah.com.tr:443/ahaber/ahaber3 -map 1 c:\ahaber.flv


  


  if it can't reach the 2nd link, keep playing the first one

  


  Thank you !

  


• How to use ffmpeg to record video from SDP ?

  17 août 2024, par Thomas Carlton

  I'm running Ubuntu 18.04 and I have the following SDP Offer from Kurento Media Server. The offer is saved to the file a.sdp :

  


      v=0
    o=- 3831476180 3831476180 IN IP4 172.31.46.122
    s=Kurento Media Server
    c=IN IP4 172.31.46.122
    t=0 0
    m=audio 28460 RTP/AVPF 96 0 97
    a=setup:actpass
    a=extmap:3 http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time
    a=rtpmap:96 opus/48000/2
    a=rtpmap:97 AMR/8000
    a=rtcp:28461
    a=sendrecv
    a=mid:audio0
    a=ssrc:1797155263 cname:user1913428254@host-e7ab0454
    m=video 18122 RTP/AVPF 102 103
    a=setup:actpass
    a=extmap:3 http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time
    a=rtpmap:102 VP8/90000
    a=rtpmap:103 H264/90000
    a=fmtp:103 level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=42e01f
    a=rtcp:18123
    a=sendrecv
    a=mid:video0
    a=rtcp-fb:102 nack
    a=rtcp-fb:102 nack pli
    a=rtcp-fb:102 goog-remb
    a=rtcp-fb:102 ccm fir
    a=rtcp-fb:103 nack
    a=rtcp-fb:103 nack pli
    a=rtcp-fb:103 ccm fir
    a=ssrc:2822275190 cname:user1913428254@host-e7ab0454


  


  Then, I'm calling ffmpeg to record this flow to a file :

  


  ffmpeg -max_delay 5000 -reorder_queue_size 16384 -protocol_whitelist file,crypto,udp,rtp -re -i a.sdp -vcodec copy -acodec aac -y output.mp4


  


  172.31.46.122 is the local IP adress and I'm running ffmpeg from the same machine as SDP offer. So ffmpeg has access to this IP address.

  


  I'm getting the error :

  


  


  bind failed : Address already in use.

  


  a.sdp : Invalid data found when processing input

  


  


  How can I solve that ?

  


• Why does linking different MSVC Run-Time Libraries crash in release mode ?

  9 septembre 2014, par UmNyobe

  I am using ffmpeg and Qt to build a small demo app.

  • FFmpeg is built with /MT (crossbuild or built with visual 2010)
  • Qt is always built with /MD
  • My little example is always built with /MD

  When the application

  int main(int argc, char *argv[])
  
  {
  
      QApplication a(argc, argv);
  
  
  
      av_gcd (75, 25);
  
  
  
      return a.exec();
  
  }
  
  
  
  //note : following is av_gcd source in ffmpeg libs:
  
  int64_t av_gcd(int64_t a, int64_t b)
  
  {
  
      if (b)
  
          return av_gcd(b, a % b);
  
      else
  
          return a;
  
  }

  is executed in release mode it crashes because it doesn’t see av_gcd as executable memory. The error is :

  First-chance exception at 0x0000000300905a4d in mylittleexample.exe :
  0xC0000005 : Access violation at location 0x0000000300905a4d.

  =======================================
  VERIFIER STOP 0000000000000650 : pid 0x1B9C : Attempt to execute code in
  non-executable memory (first chance).

  0000000300905A4D : Address being accessed.
  0000000300905A4D : Code
  performing invalid access.
  00000000009FF770 : Exception record. Use
  .exr to display it.
  00000000009FF280 : Context record. Use .cxr to
  display it.

  =======================================

  The address 0x0000000300905a4d doesnt change regardless of the function in the library (ffmpeg in this case), or the compiler used for the executable (vs2010, vs2012) or a different machine.

  If I use the FFmpeg built with /MD and it works as one would expect.

  1. I observe that the executable doesnt load the library when the
     library is compiled with /MT. Why is that ?
  2. Furthermore, If the library is compiled with /MT and debug
     information is enabled when the application is linked (/DEBUG
     param to the linker) then the library is loaded and everything
     execute correctly. Why ?