Andrew Lih, 21/01/2014 06:05:
Thanks for the extensive explanation, and as someone who's helped with Wikimania video in the past, I absolutely feel your pain and commend you for doing what you have so far.
Downloading from YouTube violates their TOS, though you'll notice people do it all the time.
I've uploaded thousands of YouTube videos to archive.org, I can do these too with no problem.
Nemo