At some time between the original post (requesting AV1 support) and today, Christmas came and we were able to encode AV1’s 10bit profile, huzzah!
This feature works well on a machine running tasks with an i7-14700KF and 4090.
Since then I also built a machine dedicated to these types of tasks, using Intel GPUs instead (I really should had tried this more before buying 2 of them, they’re kind of a headache with this kind of stuff, but i’ll probably make a different post regarding that )
however, 10bit isn’t an available profile for AV1 with an ARC 750 (but is for the 4090).
Perhaps its a bug, or perhaps it’s not a feature available on Intel cards? (It’s possible in handbrake).
Thereare known issues with Intel GPU 10-bit profiles. Wait till Intell will resolve it. Current state - nor oficial, nor community drivers not able to resolve it (check Github for examples). It seems issue is only driver-related.
Edit: meant to post this in a different thread. I had posted a url with known issues in arc drivers, but known issues detailed did not include 10bit av1 profiles (or any mention of encoding, but did mention video enhancement bugs in Topaz)