If something isn't watched for a long time because the vast majority of views are in the beginning, we will move to a lower quality video. And if it's watched again a lot we will re-render at a higher quality video.
The goal is to show people the highest quality content that we can. If someone is watching on a slower internet connection, that will also result in videos being rendered in lower quality.
We bias to higher quality (more CPU intensive encoding and more expensive storage for bigger files) for creators who drive more views. It's not a binary threshold, but rather a sliding scale.
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