SOLVED: High cpu usage with hw accelaration qsv

[nyanmisaka]

The QSV hardware decoder is not enabled.

Stream mapping:
  Stream #0:0 -> #0:0 (hevc (native) -> h264 (h264_qsv))
  Stream #0:1 -> #0:1 (copy)

This from ffmpeg log means its transcoding right ?

Well, yes it means the encoding to h264 is using the iGPU

But that is not the only CPU intensive task. To be able to encode it needs to decode the existing file.
By the log you posted it is  HEVC 10bit HDR content. 
So do you have hardware decoding enabled for HEVC 10bit in jellyfin?

Even if you have it enable the file is HDR so it needs to have the Tonemapping done via software since hardware tonemapping is not supporting in Coffeelake CPU.

We support OpenCL-based tone mapping for KabyLake and newer iGPUs. Coffeelake is no exception.