Part of it that no one has touched on is that bitrate is just as important as the pixel count. A high bitrate 720p video without a doubt looks crisper than a 1080p video of that same bitrate.
And a lot of videos you see at 720p have actually been “upscaled,” meaning they weren’t actually recorded at 720p.
The other thing to consider is the heavy compression that YouTube adds. This lowers quality on most videos. If you were to have the original 720p video file, it would look much better.
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