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• Why is one ffmpeg webm dash stream much larger than the others ?

  5 janvier 2017, par ranvel

  Over the summer, I worked on putting together a script which took a x264 video/mp3 stream and broke it up into the different streams so that it would work via MSE-DASH. (Based heavily on the instructions on the webmproject.org website) Those same scripts have ceased to work, turning a 6GB video into several 25 Gb videos. I kept up with updates of ffmpeg and so I don’t know when it stopped working, but I am guessing it was due to the way that their DASH Webm implementation was updated.

  I found new method which works better, but still has a major problem with one stream. I was hoping someone could explain how this encoding works so that I could understand the underlying cause.

  #!/bin/bash
  
  COMMON_OPTS="-map 0:0 -an -threads 11 -cpu-used 4 -cmp chroma"
  
  WEBM_OPTS="-f webm -c:v vp9 -keyint_min 50 -g 50 -dash 1"
  
  
  
  ffmpeg -i $1 -vn -acodec libvorbis -ab 128k audio.webm &
  
  ffmpeg -i $1 $COMMON_OPTS $WEBM_OPTS -b:v 500k -vf scale=1280:720 -y vid-500k.webm &
  
  ffmpeg -i $1 $COMMON_OPTS $WEBM_OPTS -b:v 700k -vf scale=1280:720 -y vid-700k.webm & 
  
  ffmpeg -i $1 $COMMON_OPTS $WEBM_OPTS -b:v 1000k -vf scale=1280:720 -y vid-1000k.webm &
  
  ffmpeg -i $1 $COMMON_OPTS $WEBM_OPTS -b:v 1500k -vf scale=1280:720 -y vid-1500k.webm  

  The transcode is not yet complete, but you can see where this is headed :

  -rw-r--r--  1 user  staff    87M Jan  4 23:27 audio.webm
  
  -rw-r--r--  1 user  staff    27M Jan  4 23:42 vid-1000k.webm
  
  -rw-r--r--  1 user  staff   285M Jan  4 23:42 vid-1500k.webm
  
  -rw-r--r--  1 user  staff    15M Jan  4 23:42 vid-500k.webm
  
  -rw-r--r--  1 user  staff    20M Jan  4 23:42 vid-700k.webm

  The 1500k variant is disproportionately larger than the other streams.

  The other problem is that when I use a shorter video, lets say eight or nine minutes, the above configuration runs as expected and everything is perfect. I don’t know where the limit for this is since each test costs a lot of processing power and time, but if it’s less than ten minutes, it works and if its longer than an hour, it produces massive files.

• ffmpeg exec command not running in nginx rtmp

  5 juin 2020, par evan

  I am using nginx and rtmp module to stream live hls and mpeg-dash.
here is my rtmp command in nginx .conf

  



  rtmp {
server {
    listen 1936;


    application mypull {
    live on ;
    meta copy;
    allow play all;

    pull rtmp://184.72.239.149/vod/BigBuckBunny_115k.mov name=test live=1;


    exec_push   /usr/bin/ffmpeg -re -i rtmp://localhost:1936/mypull/$name -vcodec libx264 -acodec libmp3lame -f flv rtmp://localhost:1936/hls/$name;


}


application dash {
        live on;
        dash on;
        dash_path /tmp/dash;
        dash_nested on;
        dash_fragment 5s;
        dash_playlist_length 30s;
    }
     application hls {
        live on;
        hls on;
    hls_playlist_length 30s;
    hls_fragment 5s;
        hls_path /tmp/hls;
    }
}
}


  



  but it is not playing. it seems that the ffmpeg command is not even running. and the hls and dash folders are empty. could anyone help me with it ?

  


• ffmpeg exec command not running in nginx rtmp

  22 février 2017, par evan

  I am using nginx and rtmp module to stream live hls and mpeg-dash.
  here is my rtmp command in nginx .conf

  rtmp {
  
  server {
  
      listen 1936;
  
  
  
  
  
      application mypull {
  
      live on ;
  
      meta copy;
  
      allow play all;
  
  
  
      pull rtmp://184.72.239.149/vod/BigBuckBunny_115k.mov name=test live=1;
  
  
  
  
  
      exec_push   /usr/bin/ffmpeg -re -i rtmp://localhost:1936/mypull/$name -vcodec libx264 -acodec libmp3lame -f flv rtmp://localhost:1936/hls/$name;
  
  
  
  
  
  }
  
  
  
  
  
  application dash {
  
          live on;
  
          dash on;
  
          dash_path /tmp/dash;
  
          dash_nested on;
  
          dash_fragment 5s;
  
          dash_playlist_length 30s;
  
      }
  
       application hls {
  
          live on;
  
          hls on;
  
      hls_playlist_length 30s;
  
      hls_fragment 5s;
  
          hls_path /tmp/hls;
  
      }
  
  }
  
  }

  but it is not playing. it seems that the ffmpeg command is not even running. and the hls and dash folders are empty. could anyone help me with it ?