How to speed up online video?

Question

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There are videos on YouTube, VKontakte, etc. They are played at some 100% speed.
You need to make it possible to display this video on the site, but rotate it at a speed of 150%.
Can this be done without pumping it out, but "on the fly"?

Answer 1

No.
You can't change the YouTube player.
Therefore, you need to set your own. You can download videos on the go, and on the go with ffmpeg you can do whatever you want with it.

Answer 2

In order to speed up the video by 1.5 times, you need a contact to give a bitrate one and a half times faster than HD. And he does not really give HD without pauses.

Answer 3

I know that this can be somehow shamanized by increasing the FPS.
But then what was described above about the bitrate will work. If I'm not mistaken, the bitrate for 1080p varies somewhere from 2500 to 4000 at 30 fps. To scroll through the video 2 times faster, you will have to receive video at speeds up to 8 Mbps