Is Using Same Post Title And Meta Description Big Problem?

Hello I have site with auto imported content, its video tube site. Most of the posts have only title and video as content, how should i set meta description? It is better to just leave blank and let google to grab the info, or set titles and meta description to be the same? Or how would you deal with such situation? Do you think adding some words before or after descritption generated from title would help? But then all the posts would have part of the description completely same which does not seem ver natural to me. Thanks for any help.