with the new release of libva 2.18.0-1 on systems running old intel iGPUs (AFAIK pre-haswell) on X11, video acceleration is borked again. however new driver now supports flag/ENV to disable DRI3 which causes the issue on the said platform.
if you encounter the issue, please add;
LIBVA_DRI3_DISABLE=1
to /etc/environment, you will have to reboot for it to take affect