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• how to override_ffserver parameters with a ffmpeg command line ?

  1er février 2017, par Bepeho

  I’m designing a simple camera switching system with ffmpeg and ffserver.
  I’m using ffmpeg to redirect one camera stream to a single ffserver.

  I’ve setup the ffserver to generate webm output :

  <feed>
  
      File /tmp/PREVIEW.ffm
  
      FileMaxSize 1M
  
  </feed>
  
  <stream>           
  
         Feed PREVIEW.ffm             
  
         Format webm
  
          AudioBitRate 64
  
          AudioSampleRate 24000
  
          AudioChannels 1
  
          VideoCodec libvpx
  
          VideoSize 640x380
  
          VideoFrameRate 25
  
          AVOptionVideo flags +global_header
  
          AVOptionAudio flags +global_header
  
          AVOptionVideo cpu-used 0
  
          AVOptionVideo qmin 10
  
          AVOptionVideo qmax 42
  
          AVOptionVideo quality good
  
          PreRoll 0
  
          StartSendOnKey
  
          VideoBitRate 1M
  
  </stream>

  It works well when i feed it with a ffmpeg commmand line such as :

  ffmpeg -re -rtbufsize 1500M  -thread_queue_size 512  -rtsp_transport tcp -i rtsp://admin:admin@192.168.0.10:554  -f lavfi -i anullsrc  http://localhost:8090/PREVIEW.ffm

  Now I want to insert dynamic text within the generated video stream, so I’ve added to the previous command line a drawtext directive :

  ffmpeg -re -rtbufsize 1500M -re -rtbufsize 1500M -thread_queue_size 512 -override_ffserver -rtsp_transport tcp -i rtsp://admin:admin@192.168.0.10:554 -f lavfi -i anullsrc -vf drawtext='fontfile=/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf:textfile=mytextfile.txt:reload=1:fontcolor=white:fontsize=48:box=1:boxcolor=black@0.5:boxborderw=5:x=(w-text_w):y=(h-text_h)' http://localhost:8090/PREVIEW.ffm

  But of course, it’s not working !

  I suppose that it’s because ffserver commands ffmpeg stream generation directives.

  So i’ve added a -override_ffserver parameter and audio+video generation parameters :

  ffmpeg -re -rtbufsize 1500M  -thread_queue_size 512  -rtsp_transport tcp -i rtsp://admin:admin@192.168.0.10:554  -f lavfi -i anullsrc -vf drawtext='fontfile=/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf:textfile=mytextfile.txt:reload=1:fontcolor=white:fontsize=48:box=1:boxcolor=black@0.5:boxborderw=5:x=(w-text_w):y=(h-text_h)' -vcodec libvpx -flags:v +global_header -b:v 1M -acodec libopus -ac 1 -ar 24000 -flags:a +global_header -s 320x190 -r 25 -override_ffserver http://localhost:8090/PREVIEW.ffm

  Still, the stream looks incorrect as ffplay logs lines such as :

  vp8 @ 0000000004e88220] Unknown profile 4
  
  vp8 @ 0000000004e88220] Header size larger than data 

  Can anyone give me an hint on how to solve this problem ?

  Many Thanks.

  EDIT :
  I’ve found a workaround by piping the video+audio+text mix result to a second ffmpeg process.

  Hence, There’s no need to use the override_ffserver parameter anymore :

  ffmpeg -y -re -rtbufsize 1500M  -thread_queue_size 512 -rtsp_transport tcp -i rtsp://admin:admin@192.168.0.10:554  -f lavfi -i anullsrc  -vf drawtext='fontfile=/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf:textfile=mytextfile.txt:reload=1:fontcolor=white:fontsize=48:box=1:boxcolor=black@0.5:boxborderw=5:x=(w-text_w):y=(h-text_h)' -f nut pipe:1 | ffmpeg  -i pipe:0 http://localhost:8090/PREVIEW.ffm

  But, if anyone has a better, leaner and simpler solution, I’m for it.

• How to save recorded ffmpeg webcam video to red5

  20 juillet 2014, par user3451310

  im trying to make a webcam recording program that can be accessed remotely by other users. i completed the recording locally but when i try to save it to red5 rtmp ://localhost/oflaDemo/streams/output.flv, no output produced to the streams directory and i don’t know how to stream it from other users while recording. can someone help me on this problem ?tnx heres my code :

  Thread webcam = new Thread()
  public void run()

      String fileName = new SimpleDateFormat("yyyy-MM-dd-hhmm").format(new Date());
  
     try {  
  
     OpenCVFrameGrabber grabber = new OpenCVFrameGrabber(0);  
  
     grabber.start();  
  
     opencv_core.IplImage grabbedImage = grabber.grab();  
  
     CanvasFrame canvasFrame = new CanvasFrame("Video recorder");  
  
     canvasFrame.setCanvasSize(grabbedImage.width(), grabbedImage.height());  
  
     grabber.setFrameRate(grabber.getFrameRate());  
  
  
  
  
  
  
  
     FFmpegFrameRecorder recorder = new FFmpegFrameRecorder("rtmp://localhost/oflaDemo/streams/output.flv", 800, 600);
  
  
  
     recorder.setFormat("flv");  
  
     recorder.setFrameRate(6);  
  
     recorder.setVideoBitrate(1024 * 1024); 
  
  
  
  
  
  
  
  
  
     recorder.start();
  
  
  
  
  
  
  
     while (canvasFrame.isVisible() && (grabbedImage = grabber.grab()) != null) {  
  
       canvasFrame.showImage(grabbedImage);  
  
       recorder.record(grabbedImage);  
  
     }  
  
     recorder.stop();  
  
     grabber.stop();  
  
     canvasFrame.dispose();  
  
  
  
  
  
     recorder.record();
  
  
  
   } catch (FrameGrabber.Exception ex) {  
  
     Logger.getLogger(web.class.getName()).log(Level.SEVERE, null, ex);  
  
   } catch (FrameRecorder.Exception ex) {  
  
     Logger.getLogger(web.class.getName()).log(Level.SEVERE, null, ex);  
  
   }  

   ;
  webcam.start() ;

  }        

• Unable to record mediasoup producer using FFmpeg on real server

  30 novembre 2020, par Sarvesh Patil

  I have built a nice app in react native for audio calling, many thanks to MediaSoup !!

  


  To take it to next level, I need to record some of my calls.
I used this tutorial for reference :
mediasoup recording demo

  


  I followed the FFmpeg way and have reached a point where I have created a plainTransport with

  


      router.createPlainTransport({
        // No RTP will be received from the remote side
        comedia: false,
        // FFmpeg and GStreamer don't support RTP/RTCP multiplexing ("a=rtcp-mux" in SDP)
        rtcpMux: false,
        listenIp: {ip:"0.0.0.0", announcedIp:"MY_PUBLIC_IP"},
    });



  


  Then I connect to this transport :

  


      rtpPlainTransport.connect({
        ip: 127.0.0.1,
        port: "port1",
        rtcpPort: "port2",
    });



  


  My first doubt : is the ip address in .connect({}) parameters supplied above correct ?

  


  Second, the FFMPEG command requires an SDP header. This is mine :

  


      v=0
    o=- 0 0 IN IP4 127.0.0.1
    s=-
    c=IN IP4 127.0.0.1
    t=0 0
    m=audio port1 RTP/AVPF 111
    a=rtcp:port2
    a=rtpmap:111 opus/48000/2
    a=fmtp:111 minptime=10;useinbandfec=1


  


  When I start recording, the FFMPEG process does not receive any data.
Moreover, on stopping, I get the following message

  


  


  Output file is empty, nothing was encoded (check -ss / -t / -frames
parameters if used) Exiting normally, received signal 2. Recording
process exit, code : 255, signal : null

  


  


  I was able to make the recording save on localhost with 127.0.0.1 when the server was itself running on localhost.

  


  However, with my actual server hosted with Nginx, I'm not able to figure out what is going wrong.

  


  I can see data being sent on my audio port :

  


  1 0.000000000    127.0.0.1 → 127.0.0.1    UDP 117 10183 → 5004 Len=75
2 0.020787740    127.0.0.1 → 127.0.0.1    UDP 108 10183 → 5004 Len=66
3 0.043201757    127.0.0.1 → 127.0.0.1    UDP 118 10183 → 5004 Len=76


  


  What do I do with FFmpeg so that it starts the recording !?

  


  Can someone please help ?