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• FFMPEG HTTP protocol closing after first packet

  27 août 2019, par rusty

  I’m trying to send a live video stream from my webcam to FFMPEG via the HTTP protocol. However after the first packet is sent FFMPEG closes, but does indeed output a fully playable video. As my intention.

  After going over the documentation for the protocol I thought mulitiple_requests would stop this behavior which it did not. After searching online for a few hours I can not find an example specific to my scenario. i.e. receiving a network stream over HTTP.

  Code running on the client-side :

  var xhttp=new XMLHttpRequest;
  
  
  
  if (navigator.mediaDevices) {
  
  
  
      var constraints = { audio: true, video: true };
  
  
  
      navigator.mediaDevices.getUserMedia(constraints)
  
        .then(function(stream) {
  
          var mediaRecorder = new MediaRecorder(stream);
  
          m = mediaRecorder;
  
          m.start();
  
          m.ondataavailable=e=>{
  
            xhttp.open("POST","http://localhost:8080");
  
            xhttp.send(e.data);
  
          }
  
          setInterval(function(){
  
            m.requestData();
  
          },2000);
  
        }).catch(function(error) {
  
          console.log(error.message);
  
        });
  
  }

  The FFMPEG command I have tried thus far :

  ffmpeg -listen 1 -multiple_requests -i http://localhost:8080 file.webm

  Maybe this is not possible with FFMPEG ? If this is the case then it appears the only solution would be to put this command in a loop and keep appending to the output.

• Roadmap #3582 : Simplifier l’utilsation des documents

  26 janvier 2017, par b b

  @franck ce ticket est une mini roadmap, essayons de la garder centré sur l’objet principal :)

  (du coup, je ne suis pas certain que ton dernier commentaire y ait sa place)

• Reading images from AXIS ip camera using OpenCV

  14 juin 2016, par batuman

  I am trying to access AXIS IP camera from my program using OpenCV.
  My OpenCV version is 3.1. I follow this tutorial link.

  I have all libraries installed.
  My following program can load mp4 video successfully. That means ffmpeg and necessary libraries are working fine.

  #include <iostream>
  
  #include <opencv2></opencv2>opencv.hpp>
  
  
  
  using namespace std;
  
  int main() {
  
      cv::VideoCapture vcap("test.mp4");
  
      cv::Mat image;
  
  //    const string address = "rtsp://root:pass@192.168.0.90/axis-media/media.amp?camera=1";
  
  //    if(!vcap.open(address)){
  
  //      std::cout &lt;&lt; "Error opening video stream or file " &lt;&lt; std::endl;
  
  //      return -1;
  
  //    }
  
      for(;;){
  
          if(!vcap.read(image)){
  
              std::cout &lt;&lt; "No frame" &lt;&lt; std::endl;
  
              cv::waitKey(0);
  
          }
  
          cv::imshow("Display", image);
  
          cv::waitKey(1);
  
      }
  
      return 0;
  
  }
  
  </iostream>

  When I tried to access the IP Camera as follow

  cv::VideoCapture vcap("rtsp://root:pass@192.168.0.90/axis-media/media.amp?camera=1");

  I have the following error

  GStreamer Plugin: Embedded video playback halted; module source reported: Could 
  
  not open resource for reading and writing.
  
  OpenCV Error: Unspecified error (GStreamer: unable to start pipeline
  
  ) in cvCaptureFromCAM_GStreamer, file /home/Softwares/opencv/opencv/modules
  
  /videoio/src/cap_gstreamer.cpp, line 818
  
  terminate called after throwing an instance of 'cv::Exception'
  
    what():  /home/Softwares/opencv/opencv/modules/videoio/src/cap_gstreamer.
  
  cpp:818: error: (-2) GStreamer: unable to start pipeline
  
   in function cvCaptureFromCAM_GStreamer

  User is root and password is pass and ip 192.168.0.90 are all defaults.

  My if config gave me

  ifconfig
  
  eth0      Link encap:Ethernet  HWaddr b8:2a:72:c6:b8:13  
  
            inet6 addr: fe80::ba2a:72ff:fec6:b813/64 Scope:Link
  
            UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
  
            RX packets:723959 errors:0 dropped:0 overruns:0 frame:0
  
            TX packets:116637 errors:0 dropped:0 overruns:0 carrier:0
  
            collisions:0 txqueuelen:1000 
  
            RX bytes:199422245 (199.4 MB)  TX bytes:13701699 (13.7 MB)
  
  
  
  lo        Link encap:Local Loopback  
  
            inet addr:127.0.0.1  Mask:255.0.0.0
  
            inet6 addr: ::1/128 Scope:Host
  
            UP LOOPBACK RUNNING  MTU:65536  Metric:1
  
            RX packets:24829 errors:0 dropped:0 overruns:0 frame:0
  
            TX packets:24829 errors:0 dropped:0 overruns:0 carrier:0
  
            collisions:0 txqueuelen:0 
  
            RX bytes:2502903 (2.5 MB)  TX bytes:2502903 (2.5 MB)
  
  
  
  wlan0     Link encap:Ethernet  HWaddr a0:a8:cd:99:92:60  
  
            UP BROADCAST MULTICAST  MTU:1500  Metric:1
  
            RX packets:0 errors:0 dropped:0 overruns:0 frame:0
  
            TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
  
            collisions:0 txqueuelen:1000 
  
            RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

  What could be the problem for this access to the camera ?

  Thanks