[HELP] how to encode AVS2 to H265 video?

[Selur]

and the error is not support 10bit AVS2, right?

yes

so Hybrid can't encode

Hybrid can't decode, so it can't encode it to something else.

how to solve?

BestSource and FFmpeg both use davs2 (https://github.com/pkuvcl/davs2) which does not support 10bit and which hasn't been updated in the last 3 years.
There is https://github.com/xatabhk/davs2-10bit which apparently (untested by me) aims to decode 10bit content.
No clue whether, it works or whether https://github.com/m-ab-s/media-autobuild_suite could support this to get ffmpeg builds that can decode 10bit avs2.
You would have to ask the BestSource, MediaAutoBuildSuite and maybe FFmpeg to add support for this.
Since avs2 isn't really something I encounter at all or that is requested a lot it doesn't seem to be really that well supported.

Cu Selur

Ps.: you could probably use https://github.com/xatabhk/FFmpeg-avs2-a...s/tag/A5.X and replace the ffmpeg.exe with their build to at least reencode it while only using FFmpeg (NoSynth).