Recently I have been learning an operating system online course, ucberkley CS 162. I read lecture on YouTube, but it's stuck
Sometimes, so I tried to download it directly. however, firstly it seems no way to complete this task, youbube doesn't provide a Download button for us. fortunately, a friend told me that there is a Brower plugin, which can 'make 'a Download button in YouTube
Page. Great idea, soon I installed fastertube plugin (http://kwizzu.com/) in ff and downloaded some lectures ..
Although having the Download button, things are not perfect, because subtitle is not available while watching video offline. So, keeping on DIY, worked out a Perl
Script to convert transcript from YouTube format to SRT format. Most of players can support SRT format.
Paste my solution for online learning here, hopefully it also helps you.
Enjoy learning, enjoy working. Have fun.