videospeed

I think time stretching is done natively by your browser, not by Youtube at all. I use https://github.com/igrigorik/videospeed on sites...allows any media to be stretched. Did you try another browser?

TL;DR: faster playback translates to better engagement and retention. Average adult reads prose text at 250 to 300 words per minute (wpm). By contrast, the average rate of speech for English speakers is ~150 wpm, with slide presentations often closer to 100 wpm. As a result, when given the choice, many viewers speed up video playback to ~1.3~1.5 its recorded rate to compensate for the difference. Many viewers report that accelerated viewing keeps their attention longer: faster delivery keeps the viewer more engaged with the content. In fact, with a little training many end up watching videos at 2x+ the recorded speed. Some studies report that after being exposed to accelerated playback, listeners become uncomfortable if they are forced to return to normal rate of presentation. Source: https://github.com/igrigorik/videospeed#the-science-of

For webkit based browsers, you can also use Video Speed Controller extension https://github.com/igrigorik/videospeed

Ilya Grigorik's Video Speed Controller? https://github.com/igrigorik/videospeed

Mine has just kept getting faster and faster, thanks to this Chrome extension[1]. Right now I average 2.5x speed for most videos, and 2.2x for people that talk fast. [1] https://github.com/igrigorik/videospeed

You don't need to do a thorough code review to benefit from the source code: the Chrome/Chromium web browser allows the user to load unpacked extensions directly from any folder. So simply git clone the extension, have a quick look at the recently opened (and closed) issues/PRs for any red flags, git checkout the most recent tag, and load it as unpacked. Then you are guaranteed to have the source code of exactly the extension you're running, and have done a reasonable amount due diligence for malware. And if you're interested at any point in the future you can do a code review. It's a simple strategy. Here's an example: https://github.com/igrigorik/videospeed

Video Speed Controller is one, works on HTML5 Video (including YouTube, but not limited to it). For FireFox: https://github.com/codebicycle/videospeed I think, forked from Chrome: https://github.com/igrigorik/videospeed

Relatedly, if you want to skim videos to find relevant/interesting parts, this is incredibly useful: https://github.com/igrigorik/videospeed

I watch videos that don't have slides at 16x using Video Speed Controller extension[0]. A 47 minute video becomes a 3 minute video I can go through and judge information density, slides quality, topics addressed, depth of said topics, whether there's a topic that matters to me that's addressed there. Then I decide if I'm going to watch the thing, which I note using Taskwarrior with a +watch tag, a link to the video, a description on what it's about. Then I watch it and take some notes, augment some issues with the information acquired or references, etc. I don't really do this with great quality speakers I'm familiar with, as I'm sure I will learn things. [0]: https://github.com/igrigorik/videospeed

Video Speed Controller: https://github.com/igrigorik/videospeed

Use https://github.com/igrigorik/videospeed instead.

Video Speed Controller is MIT licensed: https://github.com/igrigorik/videospeed So you could have a go at porting it to Firefox: https://developer.mozilla.org/en-US/Add-ons/WebExtensions/Po...