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https://github.com/igrigorik/videospeed

HTML5 video speed controller (for Google Chrome)
https://github.com/igrigorik/videospeed

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HTML5 video speed controller (for Google Chrome)

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README 

        
# The science of accelerated playback



**TL;DR: faster playback translates to better engagement and retention.**



The average adult reads prose text at

[250 to 300 words per minute](http://www.paperbecause.com/PIOP/files/f7/f7bb6bc5-2c4a-466f-9ae7-b483a2c0dca4.pdf)

(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](http://research.microsoft.com/en-us/um/redmond/groups/coet/compression/chi99/paper.pdf)

to compensate for the difference.



Many viewers report that

[accelerated viewing keeps their attention longer](http://www.enounce.com/docs/BYUPaper020319.pdf):

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](http://alumni.media.mit.edu/~barons/html/avios92.html#beasleyalteredspeech)

if they are forced to return to normal rate of presentation.



## Faster HTML5 Video



HTML5 video provides a native API to accelerate playback of any video. The

problem is many players either hide or limit this functionality. For the best

results, playback speed adjustments should be easy and frequent to match the pace

and content being covered: we don't read at a fixed speed, and similarly, we

need an easy way to accelerate the video, slow it down, and quickly rewind the

last point to listen to it a few more times.



![Player](https://cloud.githubusercontent.com/assets/2400185/24076745/5723e6ae-0c41-11e7-820c-1d8e814a2888.png)



### _[Install Chrome Extension](https://chrome.google.com/webstore/detail/video-speed-controller/nffaoalbilbmmfgbnbgppjihopabppdk)_



\*\* Once the extension is installed simply navigate to any page that offers

HTML5 video ([example](http://www.youtube.com/watch?v=E9FxNzv1Tr8)), and you'll

see a speed indicator in top left corner. Hover over the indicator to reveal the

controls to accelerate, slowdown, and quickly rewind or advance the video. Or,

even better, simply use your keyboard:



- **S** - decrease playback speed.

- **D** - increase playback speed.

- **R** - reset playback speed to 1.0x.

- **Z** - rewind video by 10 seconds.

- **X** - advance video by 10 seconds.

- **G** - toggle between current and user configurable preferred speed.

- **V** - show/hide the controller.



You can customize and reassign the default shortcut keys in the extensions

settings page as well as add additional shortcut keys to match your

preferences. As an example, you can assign multiple "preferred speed" shortcuts with different values, allowing you to quickly toggle between your most frequently used speeds. To add a new shortcut, open extension settings

and click "Add New".

After making changes or adding new settings, remember to refresh the video viewing page for them to take effect.



![settings Add New shortcut](https://user-images.githubusercontent.com/121805/50726471-50242200-1172-11e9-902f-0e5958387617.jpg)



Unfortunately, some sites may assign other functionality to one of the shortcut keys - this is inevitable. As a workaround, the extension

listens both for lower and upper case values (i.e. you can use

`Shift-`) if there is other functionality assigned to the lowercase

key. This is not a perfect solution since some sites may listen to both, but it works

most of the time.



### FAQ



**The video controls are not showing up?** This extension is only compatible

with HTML5 video. If you don't see the controls showing up, chances are you are

viewing a Flash video. If you want to confirm, try right-clicking on the video

and inspect the menu: if it mentions flash, then that's the issue. That said,

most sites will fallback to HTML5 if they detect that Flash it not available.

You can try manually disabling Flash plugin in Chrome:



- In a new tab, navigate to `chrome://settings/content/flash`

- Disable "Allow sites to run Flash"

- Restart your browser and try playing your video again



**The speed controls are not showing up for local videos?** To enable playback

of local media (e.g. File > Open File), you need to grant additional permissions

to the extension.



- In a new tab, navigate to `chrome://extensions`

- Find "Video Speed Controller" extension in the list and enable "Allow access

  to file URLs"

- Open a new tab and try opening a local file; the controls should show up.



### License



(MIT License) - Copyright (c) 2014 Ilya Grigorik