Most sources designed to output 24fps actually slightly speed up the video to 25fps for better synchronicity with a 50Hz TV, but that still leaves the telly with two choices: display each frame twice, or add a frame in between those it’s receiving to bridge the gap. Many TVs now refresh each frame at double that rate, while others claim to triple it or beyond (though often don’t). In other countries such as the US, a mains frequency of 60Hz results in the display showing 60 frames per second. In fact, they naturally display 50 frames per second in countries such as the UK that have a mains frequency of 50Hz. Your eyes often perceive this as any combination of judder, blur, or weird artefacts around the subject in question, depending on the speed of the motion and the native response time of your TV.Īny TV is capable of displaying far more than just 24 frames per second, though. It's slow enough that with fast motion an object or person can jump from one point on the screen to another a few pixels away. It’s because the frame rate used for a lot of content is actually rather low: 24fps for almost all films and the vast majority of scripted TV shows. It's exceptionally clever when you think about it, but why would you want extra frames inserted into the video you’re watching? It generally works by introducing artificial frames of video between the actual frames provided by the source. Motion smoothing, also referred to as motion interpolation or motion processing, is technology built into most modern TVs that’s designed to reduce judder and blur from video sources.
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