# Separate audio & video STREAMS from video-TRACK
            args_separate = ['ffmpeg', '-y', '-i', fSrcVideo,
                             '-map', '0:a', '-f', 'wav', '-b:a', '48k', fAudioStream,  # force 48kHz wav
                             '-map', '0:v',              fVideoStream]
            subprocess.run(args_separate, check=True)