noctropolis

I would like to ask some lame question. I have small niche tube site which embeds videos from big tubes like XVideos. I'm using WP-SCRIPT for my site. I read many times that oryginal hand-written video title is important for SEO. But would like to ask: what with video descriptions? Which is the best? Leave them empty, duplicate decription from title or write oryginal description too? If oryginal, how long it should be for SEO? One sentence or much? Logically would be - additional, oryginal and long description would be best for SEO. But I'm not sure for that because I "spied" other smaller and bigger embedding videos tube vebsites and most of them have only video title, but no video description at all! Maybe 10% of sites I watched have oryginal descriptions too besides title, but it was only one sentence descriptions for each video, no longer! So please tell me from your experience, what is the best option: no video description, description copied from title, one sentence oryginal description or longer (how long) oryginal decription? I will be very grateful for each answer.