FWIW, youtube-dl can easily download the video. i.e. `youtube-dl http://www.gdcvault.com/play/1022186/Parallelizing-the-Naugh.... You can use it almost everywhere, despite the name.

I had the same issue on my Mac. Ended up buying Boom 2 to boost the volume. I wouldn't have just for one talk, but it's been happening a lot lately where I find content volume to be too low.