ffmpeg audio/video sync

ffmpeg_sync.py

import subprocess

def extract_audio_ffmpeg(input_file, output_file, start_time, end_time):
    command = [
        'ffmpeg',
        '-i', input_file,
        '-ss', start_time,  # Start time in HH:MM:SS format
        '-to', end_time,    # End time in HH:MM:SS format
        '-async', '1',      # Attempts to correct for any sync issues
        '-c:a', 'pcm_s16le',  # Uncompressed WAV output
        '-ar', '44100',     # Force audio sample rate to 44100 Hz
        output_file
    ]
    subprocess.run(command, stdout=subprocess.PIPE, stderr=subprocess.PIPE)

# Example usage: Adjust times as needed.
extract_audio_ffmpeg('input.mp4', 'output.wav', '00:00:00', '00:02:28')

ffmpeg_sync_alt.py

import subprocess

def extractAudioUsingFFmpeg(inputFile, outputFile, startTimeInSeconds, endTimeInSeconds):
    command = [
        'ffmpeg',
        '-i', inputFile,
        '-ss', str(startTimeInSeconds),
        '-to', str(endTimeInSeconds),
        '-c:a', 'pcm_s16le',  # PCM codec for WAV output
        '-ar', '44100',  # Sample rate in Hz
        outputFile
    ]
    subprocess.run(command)

# Example usage
extractAudioUsingFFmpeg("input.mp4", "output.wav", 0, 10)

You can also test/analyze your input files for any discrepancies:

ffmpeg -i input.mp4 -filter_complex "[0:a]ashowinfo" -f null -