Recherche avancée

Sur d’autres sites (8100)

• 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 !

  


• FFMPEG : Controlling overlay through zmq 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 zqm to control this, and we've managed to control an audio filter successfully through zqm.

  


  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 zqm, 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 ! Thanks in advance !