Comment 16 for bug 1826201

Upstream has a patch that seems to work, you can install that package that includes it if you want to test as well
https://launchpad.net/~ubuntu-desktop/+archive/ubuntu/ppa/+build/16722126/+files/gstreamer1.0-vaapi_1.15.90-1+test1_amd64.deb

The fix should be part of the incoming 1.16 SRU coming to Disco