My enjoyment of Learn to Use Biblical Greek is being somewhat spoilt by the poor video encoding that's being used. I chose to download all the videos to ensure high quality, but I'm still only getting 2.4Mbps. It's not good enough to support the high resolution, and is very noticeable, especially during transitions.
Here's a screen grab that illustrates the problem.

For 1080p HD at 24fps (which these videos are), YouTube recommend 8Mbps.
Is there a reason why I can't access these videos at a decent bit rate, even if I'm downloading them?