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• Joining audio file and all frame picture to video format with Python ffmpeg

  29 septembre 2020, par muh.widad

  i have a tmp directory which contains a collection of image frames and audio files. i am using linux mint 19.3 and python3.8. in the terminal I type
ffmpeg -i tmp/%d.png -vcodec png tmp/output.mov -y
and ffmpeg -i tmp/output.mov -i tmp/audio.mp3 -codec copy output.mov -y
then the collection of images and audio in the directory will become a complete video. that I asked

  


  

  1. when I run it in python using the syntax
call(["ffmpeg", "-i", "tmp/%d.png" , "-vcodec", "png", "tmp/output.mov", "-y"],stdout=open(os.devnull, "w"), stderr=STDOUT)
and
call(["ffmpeg", "-i", "tmp/output.mov", "-i", "tmp/audio.mp3", "-codec", "copy", "output.mov", "-y"],stdout=open(os.devnull, "w"), stderr=STDOUT)
it does not merge into a video (without output error)

  


  2. I tried the syntax
os.system("ffmpeg -i tmp/%d.png -vcodec png tmp/output.mov -y")
and
os.system("ffmpeg -i tmp/output.mov -i tmp/audio.mp3 -codec copy output.mov -y"), the video failed to merge with the error output tmp/output.mov : No such file or directory

  


  


  Please help. thank you

  


• 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()


  


• ffmpeg merge video and audio + fade out

  1er mai 2016, par jacky brown

  I have one video file and one audio file.
  I want to merge them together that the final output video will be in the length of the video and will contain the audio in the background.

  i did :

  ffmpeg -i output.avi -i bgmusic.mp3 -filter_complex " [1:0] apad " -shortest out.avi

  but the background audio is cut in the end of the final merge movie.
  i want it to fade out nicely.

  how can i do it ??

  but the background audio is cut in the end of the final merge movie.
  i want it to fade out nicely.

  how can i do it ??

  thanks.