In the latest
TestFlight beta (v7.8.2204) v4.0.0 release we've added a new setting:
Settings > Playback > Deinterlacing > Experimental
Turning this on will enable a new deinterlacer we've been working on which uses Apple's
Metal.framework. It implements an advanced motion-compensating algorithm directly in the GPU, and works with both the Default and Experimental video drivers.
We've tested on the Apple TV 4K and it works quite well, producing a very high quality image at 60fps.
The Apple TV HD (with A8 GPU) unfortunately is not fast enough for this feature, so the Experimental option is not available on that device.
Try it out on your interlaced channels and let us know how it works for you below!