I am attempting to watch live TV using a Hauppage tv tuner and am getting terrible performance. While watching one video stream of MPEG2 at 1080p I'm getting nearly 50% GPU usage and experiencing tons of stuttering with no other applications running. Really disappointing for a brand new GPU/CPU combo.
RX 5700 reference (19.8.2)
ASUS Prime X570 Pro 188.8.131.52 ABB
I've put up with the BSODs, freezing, lack of hardware acceleration etc. - but when a $350 GPU in 2019 can't decode one 1080p video stream with reasonable efficiency and a consistent frame rate something is seriously wrong. Any help is appreciated.
I have exactly the same problem (and hardware by the way).
Fixen this for now (not sure if it a full solution) for me was to reduce the screen refresh rate from 75HZ to 60HZ.
This caused the GPU usage to drop from 30% to 10% while playing the same YouTube video.
Also see https://community.amd.com/thread/242932 for a lot of other people with 75HZ problems.