Recherche avancée

Sur d’autres sites (13557)

• OpenCV cannot connect to video stream - lack of some codec ?

  25 février 2016, par Chris92

  I use application IPCamera on my mobile phone with Android to output (share) video image from it’s camera to LAN. I can access it on PC browser - that is ok.

  However, I want to make OpenCV capture this video stream from IP address by typing

  VideoCapture cap("http://admin:admin@192.168.0.11:8081/?action=stream?dummy=param.mjpg");
  
   while( cap.isOpened() )
  
   {
  
      Mat frame;
  
      if ( ! cap.read(frame) )
  
          break;
  
  
  
      cout << "Connected!!";
  
  
  
      imshow("lalala",frame);
  
      int k = waitKey(10);
  
      if ( k==27 )
  
          break;
  
  }

  and i got error :

  

  Actual codec, which is used by phone is mjpeg (i read it from application on my mobile). I don’t know if OpenCV supports this, but is that about mobile application uses some kind of unique codec, or my PC lacks it, or maybe C++/OpenCV code is wrong ?

• Stream Video from Raspberry Pi to my Webpage

  21 septembre 2016, par velu4689

  I want to live stream the video captured on my SJ 4000 Camera.

  The Camera is Connected to my Rpi by Wi-Fi and the stream is available using the following address : rtsp ://192.168.1.254/sjcam.mov

  Now, I want to watch this stream in my webpage by using a Streaming Engine on Raspberry Pi.

  The rtsp ://Camera addr works when I Connected the Camera directly to my Windows PC and attempted using VLC. But I wanted to do it by using Rpi as the streaming engine.

  I have attempted the following :

  1) Using ffmpeg -i "rtsp ://[IP_ADDR]" -vcodec -f http://[my_pc_IP_ADDR]
  But am getting an error message "Unable to find a suitable output format for ’http://192.168.55.39:5678".

  2) Installed OMX Player. But I do not find proper material to stream using OMX Player.

  3) Have come across GStreamer. But still the same problem..I did not find proper material.

  Kindly provide your valuable inputs.

  Thanks.

• UDP : Streaming desktop ffmpeg over Wide area network

  16 novembre 2017, par Megan Woodruff

  I am using ffmpeg to stream my desktop. It works perfectly over the LAN with two connected PCs ; however, over a WAN, the reciever gets unviewable shearing and tearing of the desktop. We figured it was because the LAN has a 5 MB/s bandwith and the WAN has a bandwidth limitation 1 MB/s. When I checked the ethernet output of the sending PC, the bandwidth was 1 MB/s .02.

  The original ffmpeg script I used was within a batch file was :

  ffmpeg -f dshow -i video="screen-capture-recorder"-vcodec
  
  libx264 -preset ultrafast -pix_fmt yuv420p -tune zerolatency -r 30 -b:v 750k -minrate 750k -maxrate 750k  -f mpegts udp://ip:port 

  On the reciever side :
  1. I opened the scream capture recorder GUI.
  2. Inserted the appropriate udp address.
  3. Hit "Start Recieving".

  I did a wireshark analysis and noticed most of the packets I saw were MPEG TS packets with had "MP2T fragment of a reassembled package" in the description column.

  My question is : has anyone been able to successful stream via ffmpeg over a wide area network with no issues of the recieving video ? If so, what ffmpeg parameters did you use for consistent results ?