With phones sporting 8k 24 FPS and 8k 30 FPS modes, I'm may assume that this is the very best thing to happen in mobile video. However, unless you have an 8k TV to enjoy the content on the video is mostly a marketing gimmick/future proofing. 4k 120 FPS is great for three reasons
Quality:
4K (UHD) video shot under the same conditions as a 1080p (HD) video from the same phone should look better than the 1080p stream. 4K televisions are also prolific enough that when blown up you can appreciate the difference in quality.
Availability:
4K televisions are prolific these days. Phones theese days can also have the computational power to record 4K footage. Most phones also have the storage space to record plenty of footage.
What Can You Do With The Footage:
4K 120 FPS is not great just because you get smooth crisp video but because you can slow it down. If you open up a video editing app like Luma Fusion and slow the clip down 1/8th of a time you get great slow motion footage that is not junky, dim, and dark like most slow motion modes on phones. This is because you recorded at a high frame rate. The extra frame rate means there is more image data to work with. This should lead to epic, crisp 4K, slowmotion clips. So come on Samsung add 4K 120 to your phones!!
God Bless and Tech Talk To You Later!!
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