HDMI M1 Mac 'judder'

I learned that sometimes on some sites, I get judder. Judder is where the background seems to flash on and off. I thought that it was the settings on the mac and kept changing the refreshrate thinking it would help. I didn't have it with a cable from USB-c to HDMI. The HDMI to HDMI, got this strange strobing.

My monitor is an Acer Nitro and I found that if you turn off the Freesync on the monitor, the judder goes away!

Why does this happen on some sites but not others?

Mac mini 2018 or later

Posted on Oct 29, 2022 11:10 AM

Top-ranking reply

BDAqua

Level 10

250,253 points

Posted on Oct 29, 2022 12:08 PM

Great find my friend. :")

It happens when the frame rate of the content you are watching doesn’t divide evenly into the refresh rate of your television.

Almost any movie has 24 frames per second, which means it has 24 Hz. Most modern televisions have 60 Hz screens. This means that your TV has to add extra frames to play back the content.

It’s simple, the TV just duplicates the original frames. However, there is one problem – you cannot add the same number of frames to each frame because 60 is not divisible by 24 (or rather, if you divide it, you do not get a whole number). That’s why modern TVs use 3:2 technology, where some frames are duplicated 3 times and some only 2 times.

Newer 120 Hz panels can eliminate this problem by performing a 5:5 pulldown which involves adjusting the refresh rate to better suit the content.

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HDMI M1 Mac 'judder'

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