After upgrading to Google Chrome version 50 I could hear sound in YouTube videos, but no images/video. At first I thought this was a matter just affecting me. Now I noticed that another machine which I upgraded to Google Chrome v50 also lost the ability to watch video in YouTube. This other machine had a different graphic setup, so the problem was not something related just to my graphic-card configuration. The same problem is true for Chromium. For some time I switched to Firefox, which does not suffer from this hitch.
Luckily I had yet another machine which still had a working Google Chrome v49 browser. I used the very handy fakepkg program written by Gordian Edenhofer to make an Arch package from this v49 installation, see also pacman/Tips and tricks and the
bacman command. And voilà, I can now downgrade to a usable Google Chrome version, whenever there is a need:
pacman -U google-chrome-49.0.2623.112-1.pkg.tar.xz
which after two minutes generated
google-chrome-49.0.2623.112-1.pkg.tar.xz. These two minutes are mostly due to compressing with
Google Chrome is in AUR. I recommend to set
/etc/makepkg.conf, so AUR packages are cached, very similar to the “normal” packages.
pacaur -Syu --ignore google-chrome
to ignore updates for Google Chrome, or use
/etc/pacman.conf, see Skip package from being upgraded.
See also Google Chrome Became a Performance Hog.
Update 04-Jun-2016: Chromium 51.0.2704.63 is fine again, i.e., it shows video.