I recently installed Chromium on my Macbook Pro via Homebrew with:
brew install --cask chromium
and I'm finding that videos are not playing in the browser on a number of sites. All videos on CNN.com for example will not play. Are there any additional steps I need to take to get additional codecs installed?
By default, Chromium does not support proprietary codecs. You can get a build with all the codecs from Woolyss, the builds with all the codecs enabled are tagged with "all-codecs+".
Or you can use this homebrew tap to get the updates through homebrew.