Originally Posted by Mike4OLED
I was wondering why my real cinema was on but greyed out while watching my FiOS set top, so I'm glad this was brought up. My FiOS box is set to 1080i for all material. TruMotion on/off makes no difference....real cinema greyed out. The only thing I can think of at this moment is that my FiOS is plugged into the XB1S via HDMI in. So is the Xbox scaling my TV content to 1080p and that's why I'm not seeing an option for real cinema?
Hmm, that could be the case. Try connecting your FiOS box directly into the TV rather than going through the Xbox.
Here's what I have determined happens with the RealCinema menu control under Picture Options based on three different types of input signal.
A. any interlaced signal, typically from broadcast/cable TV
(e.g. 480i60, 1080i60): The RealCinema menu control will NEVER be grayed out (regardless of how TruMotion is set). It is accessible and can be turned on or off. When turned on, RealCinema performs reverse telecine on content it detects originally was filmed at 24fps in order to recreate a 24p cadence. (In other words, the feature is trying to restore the original motion that the content had when it was filmed, before it was mangled by the broadcast system.)
B. any progressive signal OTHER than 24p
(e.g. 720p60, 1080p30, etc.): The RealCinema menu control IS ALWAYS grayed out for such signals and cannot be turned on or off (regardless of how TruMotion is set). This is because the feature cannot do anything for these signals; unlike similar features on other TVs (e.g. MotionFlow on Sony TVs), RealCinema cannot perform reverse telecine on progressive scan signals.
C. any 24p signal
(i.e. a progressive scan 24fps/24Hz signal such as 720p24, 1080p24 and 2160p24): The RealCinema menu control IS NOT grayed out IF TruMotion is turned off but it IS grayed out IF TruMotion is turned on (to Smooth, Clear, or User). I don't think the RealCinema feature is really doing anything to a 24p signal, regardless of whether it shows as being "on" or "off," since there's really nothing for it to do; there's no need to restore the original cinematic cadence since, by definition, it still exists in a 24p signal.
I'm glad I ran through all of the testing I did on RealCinema because it has apparently answered one of the questions I had about this TV from before I bought it: whether or not its built-in apps like Netflix, Hulu, Amazon, etc. fetch and display 24p streams from those services' servers. Those apps on my TiVo Roamio can do so but VERY few external streamers have that capability. Apple TV, Fire TV, etc. tend to output everything at 30p or 60p. Netflix, etc. *may* be sending those boxes 24p streams in some cases but, if so, the boxes are performing telecine and outputting at 30p or 60p.
When investigating how the RealCinema menu control responds to a 24p signal, I started with signals I knew for certain were 24p: a movie on Blu-ray (with the player's on-screen status showing "24p") and content from Netflix that I knew to be encoded at 24p (their original series Bloodline, as well as theatrical films) coming from the Netflix app on my TiVo Roamio, which was set to output streaming content at 1080p24 if available. In all those cases, the RealCinema menu control behaved the same way, as described in scenario C above.
But when I played a diagnostic test video called El Fuente 60 Main10 on Netflix encoded at 30fps (revealed as such by its on-screen graphics), the RealCinema menu control grayed out, as described in scenario B above. So far, so good.
Then I played that same content using the built-in Netflix app on my LG B6. The RealCinema menu control behaved exactly the same way as when I'd played those titles from the Netflix app on my TiVo. With Bloodline, it behaved as described in scenario C, which would seem to confirm that the app was playing a 24p stream. With the El Fuente diagnostic video, it behaved as described in scenario B, as expected for a 1080p30 signal.
Beyond that, I confirmed that the built-in Hulu and Amazon Video apps also appeared to be serving up 24p streams where expected (original series Chance and movie For Your Eyes Only in Hulu; original UHD/HDR series Red Oaks and movie The Incredibles in Amazon). In all those instances, the RealCinema menu control behaved as described in scenario C above.
So there you go: apparent confirmation that the streaming apps on our LG OLEDs are presenting content originally created at 24fps in 24p on our screens.