You hit play on a video that's still downloading, and the player immediately wants bytes you don't have. First the start of the file. Then, quite often, the end, because that's where an MP4 keeps its index.

Source: [Dev.to](https://dev.to/antonreshetov/playing-a-torrent-while-it-downloads-how-i-got-start-time-from-41-s-to-8-s-hlc)

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