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

[nurunet]

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.
   

Are you getting confused? I'm looking at the picture that @MisterMcDuck shared of his HWA decode settings and he has different settings.

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
   

Sorry, not a native speaker. I meant to ask why AV1 was not the sole "deselected" codec - as I believed the hardware should support all others?