如何在iOS设备上模拟低fps？

Question

I want to simulate how the old CRT screens work on my iPhone. I need any ideas.

EDITED:

I'm interesting in 29.97Hz

Answer 1

如果在非刷新录制频率下使用摄像机录制时，您无法模拟CRT屏幕的属性，使其闪烁，LCD显示屏不像CRT那样部分更新屏幕。

Answer 2

You can't simulate the actual flicker of a CRT on an LCD display. However, if you're looking to make a scene or portion of your game look like it's on a TV, you can do any of a few tricks.

TV shows are typically 24 Hz. DVD's go up to 29.97 Hz. A little known fact is that Disney, like many animation studios, only animates at 12 Hz and shows each frame twice to achieve the 24 Hz. This means that to get the stutter associate with animated films, 12-15 Hz is your goal.

As already stated, LCD, LED, or Plasma displays are solid pictures, not strobed as CRTs are. You need to add strobing. I've found adding a single white frame every 3-4 frames add the desired effect. Typical game frame rates are 60 Hz, so a single frame lasts for 1/60 sec (or 16.7 ms). If every 4th frame is white, you get a flash simulating a refresh rate of about 15 Hz.