The experiment of capturing speaker slides using $15 HDMI capture card ended in utter failure -- the card scales down 1080p signal to composite where everything looks bad.
Here's a teardown that I've should have read before buying -- https://www.youtube.com/watch?v=pS3FOJ5qZSA
I want to try out:
EZCap 261M, I like this particular model because it has MIC in port. http://www.ezcap.com/article_read_426.html
EZCap 261 which seems to be more popular.
http://www.ezcap.com/article_read_421.html
These cards cost about $90 CAD.