in file MUSIC_dataset.py line 52:
49 video_segment = os.path.join(video_path, 'frame_' + audio_segment[:3])
50 if os.path.exists(video_segment):
51 self.audio_list.append(os.path.join(audio_path, audio_segment))
52 self.video_list.append(os.path.join(video_path, video_segment))*
you have joined the video path with the video segment