well, maybe you can try this software-moyea youtube converter which may help you solve the youtube video problems...
It is a tool designed for you to enjoy web videos (*.flv, *f4v) from video-sharing websites like YouTube, Dailymotion, Metacafe, Google Video, etc.. With it, you can edit and convert your FLV or F4V to other formats like MP4, 3GP, AVI, MPG, MPEG-4, FLV, MOV, 3G2, VOB, MP3, FLAC, MKA, OGG, WAV, AC3, M4A etc. with high quality for playback on iPod, iPhone, PSP, Xbox, Zune, Creative Zen, cell phones and so on.
http://www.my-video-converter.com/flv_converter/
hope it helps!