SOLVED: Massive artifacts in transcoded videos with VA-API hardware acceleration

[MisterMcDuck]

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I'm not sure how helpful this reply will be, but I've been testing Jellyfin 10.9 unstable and have found VAAPI transcoding and tone-mapping to be working very well. I've played H264/H265 with and without HDR/DV in 1080/4K. I too had issues with 10.8, but so far 10.9 looks good. Here are all my settings: (...)

Awesome, thanks. Two questions:

1. Why did you disable HW decoding for anything except AV1? I would have thought modern GPUs should be able to handle all those codecs.
   
2. Can VPP work without Intel hardware?
   

1. As Efficient_Good_5784 said,

The options he has enabled:

1. H264
   
   
2. HEVC
   
   
3. HEVC 10-bit
   
   
4. VC1
   
   
5. VP9 10-bit
   
   

The options he has disabled:

1. MPEG2
   
   
2. VP8
   
   
3. VP9
   
   
4. AV1
   

The disabled and enabled in this section I think were mostly the defaults. I don't recall explicitly disabling anything.

2.
I do not believe Jellyfin uses VPP on my system. I presume it checks and falls back on VAAPI for my AMD GPU.