Originally posted by: Diocles
Originally posted by: xtknight
Originally posted by: Diocles
Question #1: What do you do against 3:2 pulldown (that is, when one frame of the 24 fps movie apears for 2, and the next one for 3 refreshes on your 60Hz display, and this causes great judder) when you're watching movies on your LCD monitor?
Problem #2: Until now, I've had a 19'' which supported 75Hz natively and everything was just fine. But then I bought a HP 2475W, which can't do 75Hz but max 60Hz, which was _terrible_. Then I found out it can actually do 50Hz natively, which made things a lot better, but still not perfect as most movies are 24 fps, so about 2 frames a second are displayed 20ms longer (3 refreshes instead of 2).
That's the player's or encoder's responsibility. So maybe something like Media Player Classic Home Cinema will do it, or some of the more popular DVD software. Perhaps with some ffdshow/AviSynth stuff. I'm not too familiar with how all that stuff works together.
I thought when DVDs were encoded for home use they were set to be seen on a 60 Hz TV (NTSC) anyway so I'm not sure where this 24fps really comes in besides at the production level.
Edit: or player level
And I don't believe the input lag is cumulative. If each frame was that much laggier we'd have serious issues. But, the frame actually being shown on the monitor (assuming n is the current frame) would be n-2 assuming the display had 2 frames of lag. Therefore, the speed of update isn't really different, only the offset. It's just buffering a couple for frame processing.
I've heard of 120Hz TV that should solve this problem, but I don't need a LCD TV, because I sit close to the monitor.
Question #2: But I still require something with good colors, low input lag, 72/75Hz support and >24'' size (may be either TN, IPS, VA). Does such a monitor exist?
My question, mostly for my knowledge, is what kind of media are you playing that is 24fps? I think the player or encoder should be doing this. Apparently "soft telecine" is when the player does it, and "hard telecine" is when the encoder does it.
The reason I ask is, you'll be doomed finding a monitor over 22" that does a true 75 Hz.
Sorry, I wasn't clear enough, I'll try to do my best this time. Most (99%) of movies are encoded at 24 or 25fps, or something very close to these. On the other hand, my new HP 2475W supports only 60Hz natively. So somewhere, a 3:2 pulldown
must take place. If the video source is a PC, then the media player program
has to do this (it eats 24fps input but it can draw only to a 60Hz output).
However, I find the effect (the judder) of the 3:2 pulldown so annoying, that I simply can't watch movies on the new display. (The old 19'' 75Hz is just fine...)
So one solution would be the change the display to a 75Hz, but, as I reckoned and you reinforced this information, 75Hz display above 22'' is nonexistent.
The only other possible solution is to fix the signal coming from the PC, and this the topic I'm looking for information about. I've tried many media players (including MPC HC), but they all produce the same artifacts. I can't believe that the other at least 2 billion PC users are not annoyed to the bones by this, so there must be some simple solution I don't know of. Or is it just me who's way to sensitive for this kind of stuff?
Edit:
Video to illustrate judder:
On youtube
Original video, 24 fps @ 75Hz:
Photograph (3.2sec exposure time) (Notice the 3:3:3:3:3:3:3:3:3:4 pulldown, which is quite tolerable.)
Original video, 24 fps @ 60Hz:
Photograph (3.2sec exposure time) (Notice the 3:2 pulldown, which is totally unacceptable.)
Original video and photos are also available at:
here