feat: adds audio_on option (#434)

[hamin-lee]

Resolves #434

1. adds audio_on argument on demo.py
2. if user adds --audio_on as argument, it will generate another mp4 file with name: <result_vid_name>-with-audio.mp4
3. adds moviepy library and updates versions of numpy, imageio, scikit-image

[graphemecluster]

Hello, I am the author of demo.ipynb. To make things consistent, I think you'd better use FFmpeg from ffmpy instead:

from ffmpy import FFmpeg
FFmpeg(inputs={'temp.mp4': None, opt.driving_video: None}, outputs={opt.result_video: '-c copy -y'}).run()

And please mimsave the video as another name like temp.mp4 and remove the file afterwards. 👍

[graphemecluster]

Suggested change

	parser.add_argument("--audio_on", dest="audio_on", action="store_true", help="option to have audio on." )
	parser.add_argument("--audio", dest="audio", action="store_true", help="copy audio to output from the driving video")