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[6.8.3] Intel QuickSync transcoding not working with docker+PLEX

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Hi,
I have an issues with getting Hardware transcoding working with Plex versions higher than 1.18.0.1846-f62172e99. 

 

I have added the the following to my go file

modprobe i915 
chmod -R 777 /dev/dri

and to my docker I have added this extra paramters:

--device=/dev/dri

From the Plex docker the igpu seems to be available 

422946647_consoleoutput.png.0d1d6c5cbb7078422940b5d0eff44d63.png

but every time I start any type of transcoding it is not in hardware.

14549311_Plextranscodestatussd.png.645402bf1a73dada06f4db183400ad68.png2114691969_Plextranscodestatus.png.47e4becc3bf16d59b931a5389aa7a175.png

 

If I add "intel_iommu=igfx_off" to syslinux.cfg then HW transcoding start working again but it is incredibly blockly and unwatchable.

image.png.a20cd796af0d580daa44c556d6c24b09.png

I have also tried deleting iHD_drv_video.so as recommended on the Plex forum, which resulting in Plex showing HW transcoding is active, but the video never starts playing. 

 

My system is based on an ASRock J5005-ITX which as a Gemini Lake CPU should support HEVC 10bit transcoding. For Plex I am using linuxserver's repo.

 

Have anyone experience something similar or just have an idea how to fix it? 

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