I had to re-install Rasbian on my 3b+ and am having a problem.
When playing YouTube video, the HDMI audio is scratchy using Chromium. It SEEMS like it is a problem where the CPU cannot keep up. However, using an older version of Raspbian on the exact same hardware, I was able to play YouTube just fine. I also used to be able to watch YouTube using my old 3B (not the plus version). Using VLC to play Internet radio streams works smoothly, so that means that it is not a hardware problem.
I also tried blowing away my Chromium configuration files, so no extensions were installed, and that did not help. I also have a Chrome extension called "h264ify" that is supposed to force YouTube to use h.264. That makes no difference. Changing between 720p and 144p makes little difference.
I have a large heatsink attached, so I have plenty of cooling. Temperature is below 65C. I have a 3A power supply, so that is not an issue.
So, has something changed with the latest version of Chromium that makes it less efficient? Would increasing the ALSA buffer size help? And if so, how do I change it?
Stock latest Rasbian (April 2018 version with latest updates as of today -- 5/26/18) on a 3B+ booting off of USB SSD. Vanilla install, but I set my SDRAM to 500 MHz (extensively tested to be stable). 1920x1200 resolution. Swap memory set to 2G. Fstab changed to "commit=300." The only extra software installed is: emacs, vlc, gparted, okular.
Thanks in advance.