What is causing this (too slow) transcode?

Server Version#: 1.41.1.9057 (TrueNAS app)
Player Version#: 4.138.0 (web) and latest app on LG TV
Hardware: ASUSTOR Flashstore 12 Pro FS6712X (Intel Celeron N5105 CPU with Intel UHD Graphics and Quick Sync Video)

I can play back lots of stuff without any issues, including 4k HDR, but I suppose that’s without transcoding.

A rare subset of files - certain anime series - however, force a transcode which is too slow for this hardware to keep up with at high quality, so it drops to 0.2 Mbps SD, catches up and raises to 2 Mbps SD and might oscillate.

The transcoding happens with and without subtitles.

How can I find out why the transcode is happening, and is there any way to avoid it while still using the same clients? How can I confirm PMS is correctly detecting and using the GPU and Quick Sync Video features?

Example problematic file details:

  • Bitrate: 7996 kbps
  • Resolution: 1080p
  • Container: MKV
  • Frame Rate: 24p
  • Audio profile: lc
  • Video profile: high 10
  • Indexes: sd
  • Codec: H264
  • Bit Depth: 10
  • Chroma location: left
  • Chroma subsampling: 4:2:0
  • Level: 5.0
  • Ref Frames: 5
  • Scan type: progressive

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