如何从pytube流中提取元素？

from pytube import YouTube

video_url = 'https://www.youtube.com/watch?v=VIDEO_ID'
yt = YouTube(video_url)

streams = yt.streams

video_title = yt.title
video_author = yt.author
video_duration = yt.length

video_streams = streams.filter(file_extension='mp4', progressive=True)
video_stream = video_streams.first()

# 下载视频流
video_stream.download(output_path='path/to/save', filename='video')

# 提取音频流
audio_stream = streams.get_audio_only()
audio_stream.download(output_path='path/to/save', filename='audio')