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• FFMPEG set volume in amix

  23 juin 2017, par user5839

  I’ve been trying to mix an audio mp3 with a video mp4 while retaining the mp4 audio. This is working with .

  ffmpeg -y  -i video.mp4 -i audio.mp3
  
   -filter_complex "[0:a][1:a]amix=inputs=2:duration=longest[out]" 
  
   -map 0:v -map [out] output.mp4

  I’m now trying to adjust the volumes of the sound files (video 0.5, audio 1) as part of the mix.

  I’ve been trying things like

  ffmpeg  -i 020c276b-face-4bb3-9169-e8969c1232ba.mp4 -i test.mp3 -filter_complex 
  
   "[0:a]aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,volume=0.5[a1]; 
  
    [1:a]aformat=sample_fmts fltp:sample_rates=44100:channel_layouts=stereo,volume=0.8[a2]; 
  
    [a1][a2]amerge,pan=stereo:c0code>

  And I get errors such as

  [Parsed_aformat_2 @ 037f8620] Error parsing sample format : sample_fmts
  fltp. [AVFilterGraph @ 038be620] Error initializing filter ’aformat’
  with args ’sample
  _fmts fltp:sample_rates=44100:channel_layouts=stereo’ Error initializing complex filters. Invalid argument

  Does anyone know how to make the code I’ve code above that is working, also change the volume of the inputs ?

  Thanks

• Adjust volume of both input mp3 files while merging using ffmpeg

  18 septembre 2016, par Ali Akram

  I am using the following command to merge two audio files (mp3) into one output.mp3

  -i /sdcard/NNR/input1.mp3 -i /sdcard/NNR/input2.mp3 
  
      -filter_complex amerge -ac 2 -c:a libmp3lame 
  
      -q:a 4 /sdcard/NNR/output.mp3

  Kindly suggest me how to adjust volume level of both input files to some specific level.

  I have found the following filter variable but don’t exactly know how to adjust into my command.

  ffmpeg -i a.mp3 -i b.mp3 
  
     -filter_complex "[0:a]volume=.25[A];[1:a][A]amerge[out]" 
  
     -map [out] -c:a pcm_s16le out.wav

  Any help will be much appreciated.Thanks

• ffmpeg how to shorten volume range

  10 juillet 2021, par 敬錞 潘

  I use this command below to get volume information

  


  ffmpeg -i {fileName} -af  "volumedetect" -f null -


  


  and get result below :

  


  [Parsed_volumedetect_0 @ 000001b4f9675ec0] mean_volume: -25.1 dB
[Parsed_volumedetect_0 @ 000001b4f9675ec0] max_volume: -4.0 dB
[Parsed_volumedetect_0 @ 000001b4f9675ec0] histogram_4db: 12
[Parsed_volumedetect_0 @ 000001b4f9675ec0] histogram_5db: 72
[Parsed_volumedetect_0 @ 000001b4f9675ec0] histogram_6db: 293
[Parsed_volumedetect_0 @ 000001b4f9675ec0] histogram_7db: 808
[Parsed_volumedetect_0 @ 000001b4f9675ec0] histogram_8db: 2276
[Parsed_volumedetect_0 @ 000001b4f9675ec0] histogram_9db: 5885
[Parsed_volumedetect_0 @ 000001b4f9675ec0] histogram_10db: 13146
[Parsed_volumedetect_0 @ 000001b4f9675ec0] histogram_11db: 26627


  


  I want to shorten volume range to half range like this below

  


  [Parsed_volumedetect_0 @ 000001b4f9675ec0] histogram_6db: ...
[Parsed_volumedetect_0 @ 000001b4f9675ec0] histogram_7db: ...
[Parsed_volumedetect_0 @ 000001b4f9675ec0] histogram_8db: ...
[Parsed_volumedetect_0 @ 000001b4f9675ec0] histogram_9db: ...


  


  How to do it by ffmpeg command ?

  


  Update1 :

  


  filename.mp3 volume detect is below :

  


  [Parsed_volumedetect_0 @ 00000192cd9adcc0] max_volume: -0.3 dB
[Parsed_volumedetect_0 @ 00000192cd9adcc0] histogram_0db: 32
[Parsed_volumedetect_0 @ 00000192cd9adcc0] histogram_1db: 333
[Parsed_volumedetect_0 @ 00000192cd9adcc0] histogram_2db: 1216
[Parsed_volumedetect_0 @ 00000192cd9adcc0] histogram_3db: 3490
[Parsed_volumedetect_0 @ 00000192cd9adcc0] histogram_4db: 8829
[Parsed_volumedetect_0 @ 00000192cd9adcc0] histogram_5db: 19873


  


  after execute command

  


  ffmpeg -i filename.mp3 -af filename_output.mp3


  


  filename_output.mp3 volume detect is below :

  


  [Parsed_volumedetect_0 @ 0000017af506dd00] max_volume: -0.4 dB
[Parsed_volumedetect_0 @ 0000017af506dd00] histogram_0db: 13
[Parsed_volumedetect_0 @ 0000017af506dd00] histogram_1db: 226
[Parsed_volumedetect_0 @ 0000017af506dd00] histogram_2db: 906
[Parsed_volumedetect_0 @ 0000017af506dd00] histogram_3db: 2688
[Parsed_volumedetect_0 @ 0000017af506dd00] histogram_4db: 7202
[Parsed_volumedetect_0 @ 0000017af506dd00] histogram_5db: 16473


  


  There is no big changes, if I want to shorten more volume range , how to do ?