Replaces the audio for a given video file videoFilePath with the audio provided by audioFilePath

ffmpeg_merge_video_with_audio.py

def merge_video_with_audio_ffmpeg(videoFilePath,audioFilePath,filePathOutput,start_time_audio="00:00:05"):
    subprocess.call(['ffmpeg', '-i', videoFilePath,
                     '-itsoffset', start_time_audio,
                     '-i', audioFilePath,
                     '-c:v', 'copy',
                     '-map', '0:v:0',
                     '-map', '1:a:0',
                     filePathOutput, '-y'])