A bit of an update to those of you interested in iGPU-based hardware acceleration for the Docker version of PrismCast.
First, thanks to @ajvolin for his efforts, which brought an old path of exploration back into view. Drilling down on a somewhat complicated container image (produced by the folks at linuxserver.io -- which is what @ajvolin's test/dev image is based on), it turns out enhancements to their custom version of Xvfb is what's behind all this.
This is great news, as we can take our existing container with some additional drivers added, and use this customized version of Xvfb. I've done this, and have completed some basic testing -- but I'm feeling the need for a limited "alpha" on this before we make a more general "beta" available.
So, if you're willing and able to test a PrismCast container with Intel-based GPU acceleration, respond here or PM me, and I'll send you the Docker Compose to use. Keep in mind, this really only applies to people with Linux-derivative hosts. If you're on MacOS or Windows, and want GPU hardware acceleration, install PrismCast natively.
I'd prefer Portainer users, and you'll definitely need to be able to provide before and after comparisons of system resource usage. Also, you'll need to be able/willing to install intel-gpu-tools on your host computer, in order to capture intel_gpu_top results.