You’re not losing picture quality If you set the display rate (Hz) to match the frame rate of the material (stream) - providing your streaming & display device can natively support 24 Hz. But it’s not always easy to tell what the correct setting should be.
99% of movies are shot and stored at 24 frames per second (or a very close fraction there-of). If you match your display rate (Hz) to the source material in frames per second (FPS) you’ll get less judder. This is most noticeable on slow panning shots - you won’t eliminate judder altogether (it’s inherent in 24 FPS), but that’s part of the filmic look.
However, NetFlix (and the Apple TV+ App when not used on an Apple TV device) don’t adapt to the native frame rate - they are always locked to 60 Hz output - in which case 60 Hz is the correct display rate to use.
This means that the frame rate has to be converted for the display device (24 FPS has to be made to fit in 60 Hz). What they actually do is turn 24 frames into 48 fields and repeat some fields 3 times rather than twice. It’s called 3:2 pull-down cadence.
This does unfortunately introduce extra judder and other unwanted motion defects which you can’t get rid of.
Also, be aware that traditional TV programmes are made in 30/60 (US/Canada), or for UK/Europe we use 25/50.
Typically, streaming devices made predominantly for the US market often forget about native support for 25/50 content and often convert it (badly) to 30/60. This looks absolutely horrible!
Amazon Prime content on (newer) FireTV Stick devices does adapt to the native frame rate of the content
, But NetFlix never does ☹.
I’m afraid it’s a minefield of frame rates and display rates out there and native FPS support isn’t really improving. NetFlix seem really stubborn about sticking only to 60 Hz output in their App.
Finally, the strobing you’re seeing may be a unique phenomenon to your projector, as it’s not a common side-effect of frame-rate to display-rate mismatching.
Hope this helps a little.
Regards,
James.