Dynamic Refresh Rate is another technical term you may or may not be familiar with. Dynamic refresh rate refers to how quickly your TV or computer processes and projects what you’re viewing. 60Hz is considered to be ideal, because at that refresh rate, the human eye can no longer detect blinking, or how fast the computer redraws the images.
Unfortunately, not all videos are coded to 60Hz, and when you’re viewing a movie rendered at 30Hz on 60Hz settings, it’s not going to look very good. Dynamic refresh rate switching allows the TV Box to automatically compensate for the difference in frame rate, syncing the lower frame rate of your movie with the higher frame rate of your TV for better visual appeal.
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For this feature to work, however, you will have to ensure that your software (such as KODI), your hardware (Android, Fire TV, etc.) and your television itself are equipped with dynamic refresh rate switching. If just one of them does not have the feature, you will have to manually adjust the frame rate.