Comment # 1 on bug 106441 from Richard B. Kreckel

I can reproduce this: Totem 3.26 is basically unable to play MPEG-4 or H.264
Videos on AMD graphics cards using Mesa 18.0.3. It hangs, lags, and uses almost
all available CPU resources. I'm using X11 (Debian/testing) and tried any
combination of Mesa 17 or 18, Linux 4.15 or 4.16, amdgpu.dc=0 or amdgpu.dc=1.
I've tried various AMD graphics cards: GCN 1 (Tahiti), GCN 2 (Bonaire) and GCN
4 (Polaris11).