I have had huge problems with tearing in video playback (with Freesync enabled, ironically), and also the intermittent stalled starting of playback, since driver 18.12.1.2. If I disable Freesync the problem goes away. I did also encounter random black screens a few times also.
The last version that works is 18.12.1.1, so for me, the bug was introduced with the 2019 Edition drivers that added all the Relive features.
Running an RX 480.