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• QML Video doesn't work robust with UDP streaming

  4 avril 2017, par user2810472

  I am using QT/QML to write a player for raspberry-pi. I need to know what is the best practice of using Video QML element for a robust streaming play.

  My QML code is like below,

  Video {
  
      id: streaming_video
  
      width : parent.width
  
      height : parent.height
  
      autoPlay: false;
  
      opacity: 0.0
  
      fillMode : Image.Stretch
  
      muted : false
  
  }
  
  
  
  function switch_udpstream_on() {
  
      streaming_video.opacity = 1.0;
  
      streaming_video.source = "udp://localhost:7777";
  
      streaming_video.play();
  
  }
  
  
  
  function switch_udpstream_off() {
  
      streaming_video.opacity = 0.0;
  
      streaming_video.stop();
  
  }

  Once I started streaming sender like below,

  ffmpeg -re -i 519183632_4.mp4 -vcodec libx264 -pix_fmt yuv420p -tune zerolatency -preset ultrafast -f mpegts udp://rpi-ip:7777

  It shows the load of logs rpi player back end and start infinitely printing,

  WARNING : No decoded frame to show at all. Let’ render black.

  even though I stop sender, player is not stopping printing the above.

  If I use ffplay instead, it works fine.

• Ble with record video

  24 juillet 2017, par Vitaly

  I’m working on rpi3.
  When I try to run the command :

  sudo ffmpeg -f video4linux2 -i /dev/video0 -video_size 640x480 -r 25 output.avi

  to record a video using ffmpeg.

  In this time,I try to connect with Bluetooth.

  The BT cannot connect.

  the exception I get is :
  A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.

  top result :

  1156 root 20 0 299860 197172 137736 S 80.6 20.9 40:21.35 ffmpeg

  80.6 % cpu and 20.9 % mem.

  all the other processes take less than 1%.

  Did you encounter with this ?
  Do you have a clue what can be done ?

  Thanks

• Connection to Tvt Camera with FFmpeg via RTSP

  29 avril 2014, par Deniz Beker

  I try to connect a TVT camera with FFmpeg via RTSP. However, I cannot obtain stream info by using avformat_find_stream_info() as it is based on POST commands of HTTP. I can only obtain the codec (H.264). I already tried to increase analyze duration & probesize parameters. How can I manually set these parameters ? Or how can I obtain codec parameters ?

  Edit : I can obtain these parameters from a specific port. How can I make FFmpeg to connect via this HTTP port to obtain the metadata ?