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• ffmpeg custom audio mixing filter

  27 novembre 2016, par esposito

  I need to mix 2 files : A and B and the result is part of file A and part of File B.

  In detail I like that the output is the sum of the upper part of the file A and the lower part of file B.

  I need something like this :

  ffmpeg -i A.flac -i B.flac -af "copy all from 0 to -25 dB from 'A', copy all from -25dB to -infinite from file 'B' and put these 2 parts on the output" output.flac

  -25dB is variable that I can adjust, I like to keep the volume of file ’A’.

  In short I like to replace the soft background of file ’A’ with file ’B’.

  there is a way to do this ?

  thank you !!!!

• fluent-ffmpeg set audio level with complex filter

  31 mai 2021, par Ram Kumar

  I'm looking to mix 2 audio's with the ffmpeg-fluent, below is the code that works for this purpose.

  


  ffmpeg()
  .input(audio1)
  .input(audio2)
  .complexFilter([
    {
      filter: 'amix', options: { inputs: 2, duration: 'shortest' }
    }
  ])
  .on('end', async function (output) {
    console.log(output, 'files have been merged and saved.')
  })
  .saveToFile("mix.mp3");


  


  Now I would also want to set audio levels for each of these tracks independently, tried to pass volume as audio filter, but it doesn't seem to accept audio filter when complex filter is used.

  


• FFMPEG compand filter

  18 mars 2016, par fandyushin

  How to use compand filter for hard limit volume ?
  From documentation I get this argument : compand=attacks=0:points=-80/-80|-12/-12|20/-12
  But when I use it, i get error :

  ffmpeg -i vol_dump.ts -c:v copy -c:a aac -af "compand=attacks=0:points=-80/-80|-12/-12|20/-12" -f mpegs compand_dump.ts
  
  
  
  [Parsed_compand_0 @ 0x7f8078f0b0c0] Missing attacks and/or decays and/or points.
  
  [AVFilterGraph @ 0x7f8078c193a0] Error initializing filter 'compand' with args 'attacks=0:points=-80/-80|-12/-12|20/-12'
  
  Error opening filters!

  Whats wrong ? Thanks