High Frame Rate Blu-ray?

[ronjones]

Originally Posted by joie

Is 3D is being displayed at 48 fps?
I'd guess that it is 24 fps, alternating frames for one eye with frames for the other eye, which makes the effective frame rate 12 fps, but the brain's "post processing" makes it seem like 24 fps.

First no one does 12 Hz per eye. When we talk about Blu-Ray Discs doing 1080p/24 Hz for 2D or 3D that means 24Hz for each eye. Blu-ray records both the right and left images of a 3D image into the same "super frame" at 24 Hz using "frame packing" encoding, as defined by the HDMI 1.4b standard. The Hobbit when shown in theaters advertising RealD (3D) HFR is displaying it at 48 Hz to each eye (that's why its called High Frame Rate). Even though most of the theaters with HFR compatible digital projectors are using projectors with 4K resolution the digital cinema input signal standard limits the 3D resolution to only 2K so it appears that what you are seeing in these theater is native 2K/48Hz 3D video that has been upscaled by the projector to 4K resolution for display.