Extract audio from power point (pptx file) with ffmpeg in python

conatenation.py

import os

PREFIX_LENGTH = len('media')
POSTFIX_LENGTH = len('.wma')

files = [file for file in os.listdir('.') if file.endswith('wma')]
files.sort(key=lambda string: int(string[PREFIX_LENGTH: -1*POSTFIX_LENGTH]))
count_of_files = len(files)
input_query = ' -i '.join(files)

os.system(f"ffmpeg -i {input_query} -filter_complex '[0:0][1:0][2:0][3:0]concat=n={count_of_files}:v=0:a=1[out]' -map '[out]' output.wav")

# Bitrate range kbit/s [170-210] avg=190
# os.system("ffmpeg -i output.wav -codec:a libmp3lame -qscale:a 2 output.mp3")

# Bitrate range kbit/s [120-150] avg=130
os.system("ffmpeg -i output.wav -codec:a libmp3lame -qscale:a 5 output.mp3")

instruction.md

1. Make sure you've installed ffmpeg, FFmpeg on Ubuntu 18.04

2. change your power point file extension to zip

3. extract new zip file

4. cd to file-name/ppt/media

5. paste conatenation.py in this directory

6. run the conatenation.py

7. this will create two output.wav and output.mp3 file

Note: Then you can use the VLC player and listen to full voice in 2x speed 🎉.

I get an error:

"-filter_complex: No such file or directory"

Hey @rubyFeedback, are you on windows?
Could you remove the single quote after the filter_complex value and check that out again?

os.system(f"ffmpeg -i {input_query} -filter_complex [0:0][1:0][2:0][3:0]concat=n={count_of_files}:v=0:a=1[out] -map '[out]' output.wav")