Split audio tracks out of a video file with multiple audio tracks. Intended for use when editing videos with Blender.

splitter.py

import subprocess
import sys
import json

if len(sys.argv) == 1: # no drag and drop
    print('This script needs at least 1 additional argument. All arguments must be a list of files to split.')
    exit()

for video in sys.argv:
    if video == sys.argv[0]: continue # first argv is always the script itself

    shortVideo = video[video.rfind('\\') + 1:]

    probe = subprocess.run(["ffprobe", "-hide_banner", "-v", "error", '-show_streams', "-select_streams", "a", "-of", "json", video], capture_output=True, encoding='utf-8')
    # print(probe.stdout)
    data = json.loads(probe.stdout)
    
    for stream in data['streams']:
        index = stream['index']
        print(f'Extracting stream {index} from {shortVideo}')

        ext = stream['codec_name']
        if ext == 'aac':
            ext = 'm4a'
        if ext == 'vorbis':
            ext = 'ogg'

        dot = video.rfind('.')
        filename = f'{video[:dot]}-{index}.{ext}'
        try:
            subprocess.run(['ffmpeg', '-hide_banner', '-n', '-loglevel', 'error', '-i', video, '-map', f'0:{index}', '-c:a', 'copy', '-vn', filename], check=True)
            print(f'Saved to {filename}')
        except subprocess.CalledProcessError:
            print('')
            print('FFmpeg reported an error while extracting. Details are above.')
            print(f"(An incomplete extraction might be saved to {filename}.)")
            input('Press enter to continue extracting, or press Ctrl+C or close this window to abort the process.')        

print('Process complete.')
print('Any errors from FFmpeg have been printed.')
input('Press enter to continue.')