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• How do I integrate the FFMPEG commands with Python Script ?

  12 janvier 2021, par Sukhada Deshpande

  I am trying to extract the frames when the scene changes in an .mp4 video.
The package that I am using is FFMPEG.
FFMPEG predominantly works on the CLI and I am trying to integrate it with Python3.x

  


  The command I am using in the CLI is :

  


  ffmpeg -i {0} -vf  "select=gt(scene\,0.5), scale=640:360" -vsync vfr frame%d.png


  


  The output comes out just fine with the CLI execution.

  


  But I want to use same command in a Python script, how do I do that and what should be the code ?

  


  Being an amateur in the field, currently grappling with this !

  


• 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()


  


• How do I access the ipod-library for decoding ffmpeg in the xcode ?

  16 janvier 2014, par M_On

  Thank you to look at my question.

  There is a problem with too slow to access the music file using ffmpeg.

  Get the URL of the music that is in the ipod-library by using the 'valueForProperty:MPMediaItemPropertyAssetURL' method.

  Use the (AVAssetExportSession Class) TSLibraryImport.m, extract the music files from ipod-library.

  However, I took the extraction time is too long. (4 seconds of the 3GS iPhone, iPhone 5 is 1 second)

  It was not possible to be decoded using FFmpeg If you do not the Export.

  In order to use FFmpeg, it's AVPlayer can not be used.

  I will never forget the grace if you can answer if you folded to know how other maybe.