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• Extract Video Frames from SDP Output

  1er août 2022, par user1446797

  Does anyone know how to extract image frames from a SDP video output ? I'm using a Nest battery camera. The wired version gave me an RTSP stream which was easy to extract frames. However, the battery version gave me a SDP output which is hard to make sense of. I've looked at a few posts on stackoverflow but none seemed too promising :

  


  How to use the answerSDP returned from sdm.devices.commands.CameraLiveStream.GenerateWebRtcStream to establish a stream with google nest cam

  


  Executing FFmpeg recording using in-line SDP

  


  Even being able to stream SDP to a mp4 file using ffplay would be a nice start. But ultimately I would like to run a python script to extract frames from SDP output.

  


  I must admit, SDP (session description protocol) seems pretty long and complicated compared to working with RTSP streams. Anyway to simply convert an SDP stream to a RTSP stream ?

  


  https://andrewjprokop.wordpress.com/2013/09/30/understanding-session-description-protocol-sdp/

  


  Thanks !
Jacob

  


  SDP output looks something like this :

  


  v=0\r\no=- 0 2 IN IP4 127.0.0.1\r\ns=-\r\nt=0 0\r\na=group:BUNDLE 0 2 1\r\na=msid-semantic : WMS 16733765853514488918/633697675 virtual-6666\r\na=ice-lite\r\nm=audio 19305 UDP/TLS/RTP/SAVPF 111\r\nc=IN IP4 142.250.9.127\r\na=rtcp:9 IN IP4 0.0.0.0\r\na=candidate : 1 udp 2113939711 2607:f8b0:4002:c11::7f 19305 typ host generation 0\r\na=candidate : 1 tcp 2113939710 2607:f8b0:4002:c11::7f 19305 typ host tcptype passive generation 0\r\na=candidate : 1 ssltcp 2113939709 2607:f8b0:4002:c11::7f 443 typ host generation 0\r\na=candidate : 1 udp 2113932031 142.250.9.127 19305 typ host generation 0\r\na=candidate : 1 tcp 2113932030 142.250.9.127 19305 typ host tcptype passive generation 0\r\na=candidate : 1 ssltcp 2113932029 142.250.9.127 443 typ host generation 0\r\na=ice-ufrag:UVDO0GOJASABT95E\r\na=ice-pwd:FRILJDCJZCH+51YNWDGZIN0K\r\na=fingerprint:sha-256 24:53:14:34:59:50:89:52:72:58:04:57:71:BB:C4:89:91:3A:52:EF:C0:5A:A5:EC:B5:51:64:80:AC:13:89:8A\r\na=setup:passive\r\na=mid:0\r\na=extmap:1 urn:ietf:params:rtp-hdrext:ssrc-audio-level\r\na=extmap:3 http://www.ietf.org/id/draft-holmer-rmcat-transport-wide-cc-extensions-01\r\na=sendrecv\r\na=msid:virtual-6666 virtual-6666\r\na=rtcp-mux\r\na=rtpmap:111 opus/48000/2\r\na=rtcp-fb:111 transport-cc\r\na=fmtp:111 minptime=10 ;useinbandfec=1\r\na=ssrc:6666 cname:6666\r\nm=video 9 UDP/TLS/RTP/SAVPF 108 109\r\nc=IN IP4 0.0.0.0\r\na=rtcp:9 IN IP4 0.0.0.0\r\na=ice-ufrag:UVDO0GOJASABT95E\r\na=ice-pwd:FRILJDCJZCH+51YNWDGZIN0K\r\na=fingerprint:sha-256 24:53:14:34:59:50:89:52:72:58:04:57:71:BB:C4:89:91:3A:52:EF:C0:5A:A5:EC:B5:51:64:80:AC:13:89:8A\r\na=setup:passive\r\na=mid:1\r\na=extmap:2 http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time\r\na=extmap:13 urn:3gpp:video-orientation\r\na=extmap:3 http://www.ietf.org/id/draft-holmer-rmcat-transport-wide-cc-extensions-01\r\na=sendrecv\r\na=msid:16733765853514488918/633697675 16733765853514488918/633697675\r\na=rtcp-mux\r\na=rtpmap:108 H264/90000\r\na=rtcp-fb:108 transport-cc\r\na=rtcp-fb:108 ccm fir\r\na=rtcp-fb:108 nack\r\na=rtcp-fb:108 nack pli\r\na=rtcp-fb:108 goog-remb\r\na=fmtp:108 level-asymmetry-allowed=1 ;packetization-mode=1 ;profile-level-id=42e01f\r\na=rtpmap:109 rtx/90000\r\na=fmtp:109 apt=108\r\na=ssrc-group:FID 633697675 3798748564\r\na=ssrc:633697675 cname:633697675\r\na=ssrc:3798748564 cname:633697675\r\nm=application 9 DTLS/SCTP 5000\r\nc=IN IP4 0.0.0.0\r\na=ice-ufrag:UVDO0GOJASABT95E\r\na=ice-pwd:FRILJDCJZCH+51YNWDGZIN0K\r\na=fingerprint:sha-256 24:53:14:34:59:50:89:52:72:58:04:57:71:BB:C4:89:91:3A:52:EF:C0:5A:A5:EC:B5:51:64:80:AC:13:89:8A\r\na=setup:passive\r\na=mid:2\r\na=sctpmap:5000 webrtc-datachannel 1024\r\n

  


• 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 ?

  


• how to handle ffmpeg in asp.net on remote server

  19 juillet 2013, par user1830062

  i have done my web application using ffmpeg to covert my videos to mp4h264 baseline codec and everything works fine , my questions is how do i host the web application in server as my hosting server doesn't support ffmpeg with windows , Any advice would be helpful as where i can find a hosting provider that works ffmpeg windows server.
  thanks for your time.