Watch a film on a computer monitor and you may notice a subtle stutter during slow camera pans that you never see on a good TV. That is 24p judder, a mismatch between a movie’s frame rate and your display’s refresh rate. Monitors handle it differently from televisions, and a few settings decide whether your movies look cinematic or jerky.
Where judder comes from
Films are shot at 24 frames per second. Most monitors refresh at rates like 60, 120, or 144Hz that do not divide evenly by 24, so each film frame cannot be shown for an equal number of refreshes. The player compensates with an uneven pattern, commonly 3:2 pulldown at 60Hz, showing some frames longer than others. That unevenness reads as judder, most visible in slow, steady motion.
Which refresh rates play 24p cleanly
A refresh rate that is a whole multiple of 24 lets every frame display for the same duration, eliminating pulldown judder. The table shows how common rates line up.
| Refresh rate | Divisible by 24? | 24p result |
|---|---|---|
| 60Hz | No | 3:2 pulldown judder |
| 120Hz | Yes (5x) | Smooth, even |
| 144Hz | Yes (6x) | Smooth, even |
| 48Hz | Yes (2x) | Smooth (rarely selectable) |
How to get smooth movies
Use a multiple-of-24 refresh rate
The cleanest fix is to watch on a 120Hz or 144Hz monitor, where 24p frames each get an equal five or six refreshes. If your panel supports it and your player allows, you can also set a custom 48Hz mode for exact 2x playback. Many people already own a high-refresh gaming monitor that solves this without extra effort.
Let the player match frame rate
Media players such as MPV, or apps with “match content frame rate,” can switch the display to a compatible rate automatically when a film starts. Enable that option, and avoid heavy motion-smoothing interpolation unless you like the soap-opera look, since it changes the cinematic feel. Adaptive sync can also help by letting the display hold each frame evenly.
Adaptive sync as a judder fix
If your monitor supports variable refresh, some media players can use it to display 24p content by holding each frame for an identical interval, sidestepping pulldown even on a panel whose fixed refresh is not a multiple of 24. This is not the players’ default behavior, so you enable frame-rate matching or a VRR playback option in the app. When it works, it produces the same even cadence as a 120Hz multiple, and it adapts automatically to 25p and 30p content too, which is handy for mixed international video and streaming sources.
Motion interpolation: cinematic versus smooth
Separately from judder, some displays and players offer motion interpolation that inserts synthetic frames to smooth 24p into higher effective frame rates. This removes judder entirely but creates the soap-opera effect that makes films look like video, which most cinephiles dislike. It is a matter of taste: leave interpolation off to preserve the intended 24fps film cadence and rely on a multiple-of-24 refresh for even, judder-free playback, or turn it on if you personally prefer the ultra-smooth look on sports and casual viewing.
FAQ
Why do movies judder on my 60Hz monitor but not my TV?
60Hz cannot evenly display 24p, so it uses 3:2 pulldown that shows frames unevenly. Many TVs run at 120Hz or have dedicated 24p modes and motion processing that present film frames evenly, hiding the judder your monitor reveals.
Does a 144Hz monitor fix film judder?
Yes, because 144 is an exact multiple of 24, so each film frame displays for six equal refreshes with no pulldown. A 120Hz panel works the same way at five refreshes per frame.
Bottom line
24p judder happens when a display’s refresh rate is not a whole multiple of 24, forcing uneven pulldown that stutters on slow pans. Watch films on a 120Hz or 144Hz monitor, or set a 48Hz mode, so every frame shows for equal time, and enable your player’s match-frame-rate option. A modern high-refresh gaming monitor usually plays movies more smoothly than an old 60Hz screen.
