Hey there's nothing wrong with your projector.
It supports 4K 24p (23.976) and 1080p24 (23.976) just fine. It's a very good mid-level 4K pixel shifter. 24p is a marketing term and 99% of the published specs you see around the place means 23.976.
"The LX-UH1 is compatible with full-spec 4K input at 18Gbps throughput – supporting 4K/60p 4:4:4/36bit, 4K/60p 4:2:2/36bit, and 4K/24p 4:4:4/36bit signals"
The pixel clock in the
video card you're using is a little out at 23.979 but that's no big deal.
That's the frame rate the
video card is rendering at due to inaccuracies in the default 24p pixel clock and resolution settings.
You can create a custom resolution if you want to be super anal about it and get to an exact 23.976 output from your video card but it's not really worth it.
Just make sure you have "videoclock" checked in JRiver General Video Settings (smooths video by adjusting audio) That will stop frame skipping when the audio gets out of sync with the video. (because your pixel clock is out very slightly)
The judder you see with slow pans is inherent in 24p material and made worse on fast response time displays because the pixel (or in your case DLP) transition rate from one pixel to the next pixel is so fast that it eliminates the natural blur that was intended by 24p. (It's called frame hold time - Gaming PC monitors and a lot of projectors have a very fast pixel response which is good for 60hz and higher but at lower fps or hz it's actually a disadvantage.
You want a display to have a native frame hold time at 24p of around 40ms to be able to recreate a more natural motion blur with 24p material.
Unfortunately most displays are engineered for good high FPS performance at 60FPS or more which means they have less motion blur at 60hz but it results in stuttering or judder at 24p because the frame hold time is typically only 15 to 20ms at 24p which means the pixel has switched on and back off again faster than the next frame which means there's no natural blurring occuring.
On my desktop PC 24p medium speed panning judder is horrendous but my DLP projector its actually bearable and I generally dont notice it unless Im looking for it. Unfortunately, once you know what it is and see it, you can't unsee it and have to train yourself to not focus on it!!
Unless you use a slower response rate display device or use interpolation to add extra frames, or frame blending that adds artificial blurring between frames (that looks unnatural and more distracting to me) or Black Frame Insertion (that i mostly use on my Sony OLED because it works so well and the loss in brightness is worth it!!) Incidentally, the LG and Sony OLEDs have a measured frame hold time of 39 to 40ms @ 24p which is not accidental.
The other thing I've noticed, if the screen is too big and you have the brightness cranked up high you will notice the panning judder even more. So try turning the lamp down and sitting further back.
The judder can also be because of poor camera setting choices when filming though most cinematographers know the 180 degree shutter rule very well so avoid it most of the time.
https://beyondthetime.net/cinematic-motion-blur-180-rule/https://www.rtings.com/tv/tests/motion/stutterPS. Most good cinematographers now days know when panning faster than the 180 degree shutter rule will allow (medium to fast pans) they should have a shallow depth of field (DoF) so the background is out of focus so the panning judder is massively reduced. Check out a few scenes where the background is blurred with low DoF vs a sharp background with a high DoF and you'll see what I mean.
I've had to learn all about this to film in 4K24p with my camera to get smooth panning.
Author
Topic: Assistance with Smooth Video Project? (Read 7208 times)