Originally Posted by carter9000
Thanks --- got it!
Wonder why they did not include that in the specs at projector central.....
So....my questions is though, when showing the content at 96hz 1) does that conversion process introduce additional artifacts 2) The "judder" that it eliminating - is that inherent in the source material --- is it eliminating judder that was in the film print that was shown at the theater?
My concern is I want my image to look however it looked in the theater...if the film had judder in the theater, then I want it that way on my system at home. Not sure if I am making sense.
I guess I am just leary because it doesn't say 24p. Perhaps it is better than 24p. But sometimes better can be in the eye of the beholder. Like some of the "color enhancers" or CFI (creative frame interpolation). These tools creatively interpret the source material. I want the closest I can get to the source material. I guess I am not sure, because I don't understand what the difference is between 24hz and 96hz. Is it just showing each individual frame 4 times or is it interpreting in-between frames?
Here are the direct answers, if you want the explanation why, read below.
1) No, Creative frame interpolation (sometimes called frame interpolation) is one of the reason why video can have artifacts. Duplication of frames or 5:5, 4:4, 2:2, etc. pulldown does not.
2) Judder is generally what is introduced when you perform a 3:2 pulldown. (Making 24fps content 60fps). Blu-Rays properly mastered at 24fps won't have any judder. Theaters won't have judder, you don't want it either.
So in short, at 96hz, 4:4 pulldown would happen, resulting in the exact same image as a 24hz projector. CFI causes the soap opera effect, artifacts, and in my opinion a very "juddery" image. I love 96hz/120hz components because my 24fps content can be displayed properly and not have to go through a 3:2 pulldown which introduces judder (Used for 60hz LCD tvs). I hate CFI, it not only messes with the directors intent, but the current software turns films into a jumpy mess.
Components that can properly display 24p content (no 3:2 pull down to get it to 60hz, the "old" standard refresh rate) almost always do a 5:5 pull down because 120hz is the most common refresh rate at the moment 5 x 24 = 120). The reason why 120hz tv exist is that 120 happens to be the least common denominator of 24, 30, and 60 (All standard video refresh rates). Check it out though, to get 24p content on a 120hz tv you have to show each frame 5 times. (5:5 pulldown) So take how long each frame is shown at any given time (5/120 frames) and it breaks down to 1/24th of a second. The exact same percentage if you watched a movie on a 24hz projector. Each frame would be on the screen for 1/24th of a second. The point? If the projector is doing a 5:5 pulldown or a 4:4 pulldown or a 2:2 pulldown each frame is being displayed for the exact same length of time. Faster refresh rate, but each frame is being displayed longer to equal everything out. Sorry if that doesn't make sense, I still haven't found the perfect way to explain it.
That part is easy though, the confusion is happening because of the introduction of creative frame interpolation. Basically software created frames that are displayed instead of the exact same frame repeated some amount of times. (5 times for 120hz, 4 times for 96hz) The software looks at two frames in a row (different frames, not two of the duplicated ones) and makes a guess at what the image would be in between the two. THIS and ONLY THIS is what causes the soap opera effect and in my opinion a very jumpy image!
But it looks like you were on the right track, there is a huge difference between creative frames and the standard frame pulldown process. CFI = Bad, Pulldown a necessity and good. Let me know if this doesn't make sense.