Hi and welcome...
Can we start by asking you to say what version of BearShare you are using ?
And, please look in the
http://www.gnutellaforums.com/tips-tricks/ forum here for many threads and posts where you will find all the info you could need re: burning DVDs...
A hint... If you want to be able to burn more than one movie on to a DVD that will actually play in most newer 'home' players and not just on a computer, try converting the movie files to mpeg4 and then burn them to DVD... That is not the only way but it is a relatively simple one...