Make a youtube video and audio download api.
This api should give mp4 video and mp3 file for video and audio, it should take video id as input parameter.
This should also work for copyrighted and protected videos like vevo and music company videos that doesn't work with normal youtube downloader scripts.
I have done several YouTube API services which bypass VEVO downloads. If you are interested, contact me. We can talk about it and I can complete the job in 3 days.