NeonPizza wrote: ↑20 May 2024, 17:27
My question is, does it only support dual strobe BFI at 24fps? or both 24 & 30fps? If i pair it with a 65" QD-OLED it's been said that it will drop the motion persistence down from 16ms to 6.94ms(Since the TV is 144hz) for movies & TV, and that the BFI flicker will be roughly the same as it is compared to internal OLED TV BFI?
Both and everything in between. 26.42353245 fps? Sure. 53.234234 fps? Sure.
You do have to turn off the low-Hz strobe limiter, to unlock low-Hz strobing.
Just remember the limitations of what you can do (e.g. if you're doing 120Hz and want 60Hz BFI, you cannot do double strobe because that requires a 4:1 ratio for software-based double strobing, aka 96Hz double strobe.
I wouldn't directly compare 24fps BFI to a regular OLED TV BFI (60 flickers per second), because they are incapable of 35mm-duplicating strobe (48 flickers per second). That's 96Hz with double-strobe for 24fps, which flickers more than most OLED TV BFI, but about the same amount of flicker you got at the normal 35mm movie theater before the digital era (which flickered at 48Hz).
96Hz is used for double strobing 24fps in software -- because you need minimum 2 refresh cycles per BFI strobe, for software-based strobe (visible frame refresh cycle, and black frame refresh cycle), and since you're double strobing, you need 4 refresh cycles per frame.
There is no limitation to BFI minimum frame rate. You can do any-Hz BFI in 0.001Hz increments literally, just use a custom Linux ModeLine and configure the strobe count. It will do all the custom strobe-pattern settings that TestUFO BFI custom settings can do -- example of variable persistence strobe
www.testufo.com/blackframes#count=4&eas ... bonusufo=1 and the double strobe
www.testufo.com/blackframes#count=2&mul ... asteregg=1 can do, including the multistrobe settings. The flexibilities along with limitations are nigh nearly identical. (Change your computer refresh rate as needed; Retrotink 4K can do any custom resolutions and refresh rate via Linux-style ModeLines on SD card)
Make sure you accomodate for the limitations of bandwith, the 8bpc (24-bit color), the amount of refresh rate headroom you need for your strobe pulsewidth & strobe count, etc. Don't expect miracles if you are unfamiliar with yesterday's 35mm double strobe, which is accurately replicated.
If your TV is capable of 144Hz, you can also attempt triple strobe, as another compromise too. And if you're flicker insensitive, you can even try 24fps single strobe (48Hz ModeLine) for shockingly clear motion blur reduction of film. But it's not very eye-comfortable, given the low frame rate flickers badly.
Remember, double strobe = double image effects, exactly like the double image effects you saw at the movie theater in the 1950s through 1990s with 35mm 180-degree double-strobe. Properly set your expectations accordingly, to appreciate that it's retro-reproducing the 35mm experience, not the CRT experience, with these specific kind of setting.
Retrotink 4K will even deinterlace your 1080i/60Hz 3:2 pulldown material (e.g. HDTV broadcast), progressive-scan it, and dejudder it to 24fps 24Hz, and then you can even apply proper 35mm-style BFI to that. No other video processor that I know of (even $10,000 units) can do that, although this box was designed for the retro market, and is limited to 8bpc not 10/12bpc color. The deinterlace modes and the 35mm-style BFI modes were added as a bonus features for 35mm retrofeel -- but remember to be familiar with yesteryear 35mm retrofeel to set your expectations;
If you hate flicker, and want less flicker in a CRT-style experience instead, I recommend 144Hz + triple strobe. Better than a 60Hz CRT in judder-feel in that you don't have the 3:2 judder. Much, much better than 60Hz OLED BFI, to have 72Hz flicker that is synchronized with 24fps via triple strobe.
There's no limit to the strobecount, given refresh rate headroom and bandwidth headroom. You do get very low resolutions if you try to do a custom 360Hz on a Retrotink, but that gives you shockingly flexible strobe persistence & strobecount adjustability.