Thanks for screencasts - your episode 5 is missing audio making it harder to grock the context, just heads up in case this is unintended so you can fix
I am using a javascript player, which should send you the correct file, based on your browsers support for webm and/or mp4/flash. I have verified that both versions contain audio. So, I suspect there is some browser issue at play here. Anyone else reading this, and who has watched episode #5, want to comment on if it has audio?