Originally Posted by KillRob
As far as I understand things, motion judder is inherent in 24fps movies and shows itself most clearly in panning shots. You cannot get a smooth pan at 24fps unless the camera is moving super slowly. The only way to make it smooth and judder free is to either up the framerate of the source (like in the Hobbit HFR versions) or to use software frame-creation to insert interpolated frames. Even if you set everything to output clean 24fps that is then evenly multiplied (with out frame-creation) to match the panel refresh you still have judder because it is in the source.
Originally Posted by michaeltscott
I've never heard anyone give that description of judder (not doubting that it's one meaning of the term). Telecine Judder
is an artifact caused by the method of displaying 24p content on a 60p display; 60 is not evenly divisible by 24 so something has to be done to compensate. What's commonly done is 2:3 pulldown (sometimes called 3:2 pulldown)...
Yes, you are both
There are different "kinds" of 'motion judder' - and different things that can cause it.
Movies and most prime-time TV shows are usually recorded at 24fps; live TV, reality TV, and sports are recorded at 30fps or 60fps. If you have a Blu-ray player that can output at 24Hz/fps, I recommend using this output setting to avoid introducing 3:2 pulldown/telecine judder
(also know as 'presentation judder'). (See
excellent description of this above.)
Then there is 'motion judder' that is inherent in the source - especially with content that is filmed at 24fps - sometimes referred to as 'film judder
'. Movie directors can reduce the effects of 'film judder' by changing the scene and its lighting, and by reducing extreme camera motions. However, to deal with daylight action scenes, they usually resort to adding 'motion blur' by increasing camera shutter angles or exposure times. Once added, this motion blur is extremely difficult to remove.
' introduces additional frames between the original frames in order to increase the perceived framerate and reduce 'motion blur'. This creates a "soap opera effect" (SOE) and can also introduce undesirable visual artifacts and ghosting, and sometimes even lead to an increase in 'motion judder' (e.g. 'micro stuttering'; 'playback jitter/choppiness'; 'frame skipping').
The most advanced 'frame rate conversion' (FRC) methods use 'motion estimation' (ME), which is the process of finding corresponding points between two video frames using complex algorithms, to improve the quality of 'interpolated frames'. However, not all ME technologies are created equal.
Unless you are one of the few people who actually enjoys the dreaded SOE, you should either turn OFF all 'frame interpolation' or set it to the lowest setting - especially when watching prime-time TV shows or movies.
One of the main causes of 'motion blur
' is the fact that your eyes are continuously tracking moving objects on a screen. However, for sample-and-hold displays, such as LCDs and OLEDs, an image is statically displayed for the entire refresh. Your eyes are still moving during a refresh, causing the static image in one refresh to be blurred across your retina before the next refresh steps the image forward in the next frame.