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They in short throw away some of the pixels and only use some of the original pixels in the video and only render the pixels they didn’t throw away, it’s faster because you have less data to use if you are doing it on your device
YouTube when you upload a video, automatically creates multiple copies of it, each with lower quality, but they average out the pixels for better image quality rather than tossing them, since speed doesn’t matter because you are already doing it in advance. This is why newly uploaded videos sometimes only go up to 360p or something, it takes awhile to do all the resolutions
Different quality versions of the video is stored on the servers. When you change quality, the player simply requests the version with the specific quality.
Do you mean like how on YouTube, you can choose to watch a video in 240p, 360p, 480p, 720p, etc?
The answer is surprisingly uninteresting: When you upload a video to YouTube, they make multiple copies of it at various resolutions.
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