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• FFmpeg Matching decibel level between two audio tracks when mixing ?

  9 août 2022, par JohnWick

  I have a collection of mp3 files for various frequencies (i.e. 528hz). I also have a collection of mp3's of ambient background music. So here is the scenario :

  


  I am mixing the tone frequency mp3's with the music mp3's. This works great using the amix filter, no problem. However, some of the ambient music is quiet, which makes the tones sound overpowering. Conversely, some of the ambient music is also fairly loud, making the tones inaudible.

  


  It seems to me, the solution would be to adjust the volume of the tone to match the decibel level of the associated music track. How can this be done programmatically ? Perhaps parsing the output of a ffprobe call, but at that point I wouldn't quite be sure how to proceed towards my goal. I figured reaching out on Super User might save me a ton of pain, by turning to more experienced ffmpeg users. Maybe my approach is also flawed, and would be happy if someone can suggest a better method to achieve what I am looking for.

  


  Here is my python code so far.

  


  import ffmpeg
import os

tones = os.listdir('tones')
songs = os.listdir('music')

for tone in tones:
    for song in songs:
        tone_in = ffmpeg.input(f'tones/{tone}', stream_loop=-1)
        music_in = ffmpeg.input(f'music/{song}')
        mixed = ffmpeg.filter([tone_in, music_in], 'amix', inputs=2, duration='shortest')
        out = ffmpeg.output(mixed, f'output/{tone} {song}.mp3')
        out.run()


  


• /usr/local/share/timidity/timidity.cfg : No such file or directory

  3 juin 2016, par dodolzg

  Timidity version is TiMidity++-2.14.0, and here is my install commond :

  ./configure && make && make install

  Then I run the commond

  timidity song.mid -Ow -o | ffmpeg -i - -acodec libmp3lame -ab 64k song.mp3

  and it returns error :

  /usr/local/share/timidity/timidity.cfg : No such file or directory timidity : Can’t read any configuration file. Please check /usr/local/share/timidity/timidity.cfg

  "find / -name timidity.cfg", but there is no such file.
  I am confused about the error.
  Thanks for your reply in advance.

• Create Music Slide show with ffmpeg

  16 avril 2014, par user2637966

  I am now trying to create picture slide show video with music. So far, I only know ffmpeg will be one of the solution. I successfully create one with my own picture and music. However, i wonder whether ffmpeg allows me to create such music slide show according to the beat of a song. What i mean all picture transition takes place at each beat of the song.

  The photo slide show video should be in mp4 format.