Youtube download

(ex: Regular Youtube url): https://www.youtube.com/watch?v=Rq6aBSN_BZc

(ex: Download Specific Portion): https://www.youtube.com/embed/zeI-JD6RO0k?start=5&end=30

(ex: Download Specific Portion): https://www.youtube.com/watch?v=Rq6aBSN_BZc?start=5&end=15