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• How to display live video stream from ffmpeg in C#/WPF ?

  9 avril 2019, par Kevin McDaniel

  I am trying to get an output from FFmpeg.exe to display live on my wpf media player. The inputs to FFmpeg are an IP camera and a video file (mp4).

  The WPF media player needs a URI as the input. So, I have tried hosting a Udp server for FFmpeg to post to (which I can log the data coming in on the console). Then I try to get the stream using the media player, but no success.

  My Udp listener :

  UdpClient _udpServer = new UdpClient(5000);
  
  UdpClient _udpClient = new UdpClient(5001);
  
  private void UdpListen() {
  
     while (true)
  
     {
  
        IPEndPoint RemoteIpEndPoint = new IPEndPoint(IPAddress.Any, 0);
  
        Byte[] receiveBytes = _udpServer.Receive(ref RemoteIpEndPoint);
  
        if (RemoteIpEndPoint.ToString() != "192.168.1.110:5001")
  
        {
  
           IPEndPoint ep = new IPEndPoint(IPAddress.Parse("192.168.1.110"), 5001);
  
           _udpClient.Send(receiveBytes, receiveBytes.Length, ep);
  
        }
  
        Console.WriteLine("receive data from " + RemoteIpEndPoint.ToString() + ": " + receiveBytes.Length);
  
     }
  
  }

  The ffmpeg output : ... -f mpegts udp ://192.168.1.110:5000

  I pass this into the media player : udp ://192.168.1.110:5001

  I am expecting to see the video file being displayed as ffmpeg is processing the output. But, I just see ffmpeg do its processing, and the Udp listener writing to the console.
  Let me know where I am going wrong, thanks in advance

• error ffmpeg Cannot open display :0.0+0,0, error 1. :0.0+0,0 : Input/output error

  15 mars 2019, par SUPERMAN

  Hello I get this error when i want to capture my screen on linux with ffmpeg ubuntu 16:04 :

  the command i’am using :

  $ ffmpeg -f x11grab -r 15 -s 1920x1080 -i :0.0+0,0 -vcodec rawvideo -pix_fmt yuv420p -threads 0 -f v4l2 /dev/video0
  
  ffmpeg version 4.1.1-0york1~16.04 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.11) 20160609
  
    configuration: --prefix=/usr --extra-version='0york1~16.04' --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-nonfree --enable-libfdk-aac --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
  
    libavutil      56. 22.100 / 56. 22.100
  
    libavcodec     58. 35.100 / 58. 35.100
  
    libavformat    58. 20.100 / 58. 20.100
  
    libavdevice    58.  5.100 / 58.  5.100
  
    libavfilter     7. 40.101 /  7. 40.101
  
    libavresample   4.  0.  0 /  4.  0.  0
  
    libswscale      5.  3.100 /  5.  3.100
  
    libswresample   3.  3.100 /  3.  3.100
  
    libpostproc    55.  3.100 / 55.  3.100
  
  [x11grab @ 0x5611f156e540] Cannot open display :0.0+0,0, error 1.
  
  :0.0+0,0: Input/output error

• How to display decoded YUV420P format frames into Qt in an efficient way but without OpenGL ?

  15 février 2019, par Lucas Zanella

  I’ve been trying to render video decoded from ffmpeg ito Qt in several ways. I tried using QAbstractVideoBuffer here : How to map a decoded buffer from ffmpeg into QVideoFrame ? but ALL code examples I find construct a QImage and paint it on the screen, which I think it’s very inneficient.

  I’ve found here : https://stackoverflow.com/a/12925009/10116440 that OpenGL can also be used in Qt, but I think it is a bit of an overkill because OpenGL is for rendering intense graphics.

  I’m sure there must be a way but I couldn’t find anywhere.

  So : how to display decoded YUV420P format frames into Qt in an efficient way but without OpenGL ?

  I just need a guide, as https://doc.qt.io/qt-5/videooverview.html#working-with-low-level-video-frames won’t help me at all !