If you use Linux you might want to try youtube-dl which has quite a lot of options which should fit your scenario. I don't know if there are Windows binaries for it, but I wouldn't be surprised.
I usually use a Firefox plugin called VideoDownloadHelper which performs nicely on most embedded videos, but you still have to select the video.
Tell me how it goes
Hi, I'm not using linux but I found something else, KeepVid Pro and it works really well, I've downloaded around 800 clips in few hours.