Why video rendering takes so much power and processor when seeing the preview in the video editing software works like a charm?

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Why video rendering takes so much power and processor when seeing the preview in the video editing software works like a charm?

In: Technology

The most notable thing that rendering needs to do, that the previews don’t, is compression.

It’s pretty damn quick to render a lossless uncompressed video, which are what the previews are. But when you factor in compression, keyframes, those things require mass amounts of math that takes time to process