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• Streaming audio from mac with ffmpeg to nginx and playback with videojs

  15 juillet 2020, par Disco Fever

  I'm playing around trying to get to stream my Mac's sound to a webpage.

  


  Here's what I have so far :

  


  On the mac :

  


  ffmpeg -f avfoundation -i ":2" -acodec libmp3lame -ab32k -ac 1 -f flv rtmp://myserver:8000/hls/live


  


  On the nginx side :

  


  events {
    worker_connections  1024;
}

rtmp {
    server {
        listen 8000;
        chunk_size 4000;
        application hls {
            live on;
            interleave on;
            hls on;
            hls_path /tmp/hls;
        }
    }
}

http {
    default_type  application/octet-stream;
    sendfile off;
    tcp_nopush on;
    server {

        listen      8080;
        location /hls {
            add_header Cache-Control no-cache;
            types {
                application/vnd.apple.mpegurl m3u8;
                video/mp2t ts;
            }
            root /tmp;
        }
    }
}


  


  Web side :

  


  &#xA;&#xA;&#xA;    &#xA;    &#xA;&#xA;<code class="echappe-js">&lt;script src=&quot;//vjs.zencdn.net/7.8.2/video.min.js&quot;&gt;&lt;/script&gt;&#xA;&#xA;&#xA;&#xA;&#xA;&#xA;

  


  No matter what i do I can't get any sound (it's playing on the Mac 100% sure) ; i've tried also putting a video tag instead, i see the image but no sound. What's missing here ? Can this even be achieved ?

  


  THanks

  


• Audio effect ( a 20ms delay between right and the left channel) using Web Audio API or any Javascript Audio Library like howler.js, tone.js ?

  15 juillet 2020, par questionare_101

  I was wondering if there any option in howler.js, tone.js or any other javascript audio library which I can use to add a 20ms delay between the right and the left channel which makes the audio listening experience more immersive.

  


  Can it be achieved using Audio sprites with howler.js ? (but I guess it can't separate the right and the left channels)
https://medium.com/game-development-stuff/how-to-create-audiosprites-to-use-with-howler-js-beed5d006ac1

  


  Is there any ?

  


  Have also asked the same quest here : https://github.com/goldfire/howler.js/issues/1374

  


  I usually enable this option under ffdshow audio processor while playing audio using MPC-HC (Mega Version) on my pc. I was wondering how can I do it using Web Audio API or howler.js ?

  


  

  


  Somewhat like this kind of effect : Just delay the either channel by 20ms
Like we do in Adobe Audition


  


• FFMPEG : Controlling overlay through ZeroMQ in ffmpeg

  9 juillet 2020, par Michel

  For a project we need to manually control an overlay (static image) on top of a video stream. We concluded that we will need ZeroMQ to control this, and we've managed to control an audio filter successfully through ZeroMQ.

  


  To achieve this we've considered two options :

  


  

  1. Use a color filter to control the foreground (image) transparency

  


  2. "Move" the overlay image in front of the video stream, and remove it out of the video canvas

  


  


  We've managed to get both working, but not in combination with ZeroMQ, unfortunately.

  


  Example :

  


  ffmpeg -loglevel verbose    \
              -i $STREAM     \
              -i overlay.png  \
          -bsf:a aac_adtstoasc \
        -threads 12             \
             -vf "zmq=bind_address=tcp\\\://127.0.0.1\\\:1235, [0:v][1:v]overlay=25:25" \
            -c:a aac              \
             -af "azmq=bind_address=tcp\\\://127.0.0.1\\\:1235,volume=1" \
            -c:v h264 output


  


  The above example produces the following error :

  


  Error reinitializing filters!
Failed to inject frame into filter network: Invalid argument


  


  Advice on how this can be achieved is highly appreciated !