For those of you interested in how to fix this: The PMS 1.18.1 branch includes a new driver that breaks Hardware Transcoding for Apollo Lake Intel CPUs.   In Linuxserver.io's docker image this is located at /usr/lib/plexmediaserver/lib/dri/iHD_drv_video.so   Just delete iHD_drv_video.so and transcoding will work again.
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