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• recive klv data from a ffmpeg multicast

  5 avril 2019, par diego

  I am trying to get the klv data from a .mpeg.

  I tried this command and it works perfectly :

  ffmpeg -i video.mpg -map data-re -codec copy -f data data.klv

  (This first command has "data-re" which just works on linux, but it is the only way I found to get the .klv I need)

  Now I would like to open two CMD and transfer it by multicast, how could I do this ? i tried many comands like next ones, but I do not get the same .klv

  sender : ffmpeg -i video.mpeg -c copy -f mpegts udp://239.1.1.1:49410

  receiver : ffmpeg -i udp://239.1.1.1:49410 -map 0 -codec copy -f data data.klv

  I am new with ffmpeg and I do not know exactly what I need to change to get exactly whay I get in the first command.

  Thanks

• FFmpeg settings for encoding for 4K UHD Blu-ray Disc

  4 avril 2019, par Matt McManis

  What FFmpeg settings should I use for taking raw video and converting it to x265 for 4K UHD Disc ? This is a 1-Pass example.

  Are there more -x265-params needed ?

  For Audio, will DTS -c:a dca -strict -2 be compatible with 4K discs and palyers ? Also what is the Lossless command for dca ?

  ---

  Here is what I’ve got so far :

  ffmpeg -y 
  
  
  
  -i rawvideo 
  
  
  
  -c:v libx265 
  
  -preset slow -b:v 50M -maxrate 75M -bufsize 75M 
  
  -pix_fmt yuv420p10le 
  
  -r 60 
  
  -vf "scale=3840:-2" 
  
  -profile:v main10 -level 5.1 -sar 1:1 -x265-params "colorprim=bt2020:transfer=bt2020:colormatrix=bt2020" 
  
  -map 0:v:0?
  
  
  
  -c:s mov_text 
  
  -map 0:s? 
  
  
  
  -c:a dca -strict -2 
  
  -b:a 1509k 
  
  -map 0:a? 
  
  
  
  -f mp4 
  
  
  
  -threads 0 
  
  
  
  output.mp4

• http-flv live broadcast with flv.js error

  29 mars 2019, par Forest Yang

  When I try nginx + nginx-http-flv-module + flv.js to play video from camera, error happened, but play with VLC works fine.

  log in nginx :

  flv live: app args MUST be specified, client: 192.168.89.1, server: myserver, request: "GET /live.html HTTP/1.1", host: "192.168.89.134:8080"

  Some key configurations,

  nginx.conf :

  http{
  
     ...
  
     server{
  
     ...
  
      location /live {
  
              flv_live on;
  
              chunked_transfer_encoding  on; #open 'Transfer-Encoding: chunked' response
  
              add_header 'Access-Control-Allow-Origin' '*'; #add additional HTTP header
  
              add_header 'Access-Control-Allow-Credentials' 'true'; #add additional HTTP header
  
          }
  
  
  
      }
  
  }
  
  
  
  rtmp {
  
      server {
  
          listen 1935;
  
          server_name 192.168.89.134;
  
  
  
          application myapp {
  
              live on;
  
              gop_cache on; 
  
            }
  
      }
  
  }

  ffmpeg command :

  ffmpeg -f avfoundation -s 1280x720 -r 30  -i 0 -f flv rtmp://192.168.89.134:1935/myapp/test

  VLC network url :

  http://192.168.89.134:8080/live?port=1935&app=myapp&stream=test

  HTML with flv.js :

  if (flvjs.isSupported()) {
  
              var videoElement = document.getElementById('videoElement');
  
              var flvPlayer = flvjs.createPlayer({
  
                  type: 'flv',
  
                  'isLive': true,
  
                  url: 'http://192.168.89.134:8080/live?port=1935&app=myapp&stream=test'
  
              });
  
              flvPlayer.attachMediaElement(videoElement);
  
              flvPlayer.load();
  
              flvPlayer.play();
  
          }

  Can anyone tell me why based your experience ? thank you.