Zen

The big issue with the output being accessible by all threads, I don't know a "no pain" way to do this, the probable solution is using spinlock on output

You need to specify HDR primaries and transfer characteristics like here:https://github.com/master-of-zen/Av1an/blob/master/docs/Encoders/aomenc.md#flags-used-for-most-native-10-bit-hdr-content

Same issue, 5 seconds latency, and device shows as incompatible. Fresh install

Old issue, av1an changed quite a lot and no longer written in python

What are your encoding setting?

Try lowering your preset and crf, my guess that quality is bad because of them

Can you provide 1 minute (for test) example of source? Have you tried to deinterlace into AVC(x264)?

If quantizer value not supplied in command line - av1an adds it and changes to what target quality predicts will give desired result. In general, i would suggest to be...

By default we prefer .mkv as output as it insures that whatever been in your input file could be transmitted to the output. As for current output file, you can...

What about different approach, use vapoursynt to feed input that have them already burned-in?