{"id":13486608,"url":"https://github.com/igrigorik/videospeed","last_synced_at":"2025-05-14T13:03:29.661Z","repository":{"id":14631762,"uuid":"17349273","full_name":"igrigorik/videospeed","owner":"igrigorik","description":"HTML5 video speed controller (for Google Chrome)","archived":false,"fork":false,"pushed_at":"2024-08-02T17:11:50.000Z","size":458,"stargazers_count":3923,"open_issues_count":373,"forks_count":573,"subscribers_count":87,"default_branch":"master","last_synced_at":"2025-04-10T11:02:02.710Z","etag":null,"topics":[],"latest_commit_sha":null,"homepage":"https://chrome.google.com/webstore/detail/video-speed-controller/nffaoalbilbmmfgbnbgppjihopabppdk","language":"JavaScript","has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":null,"license":"mit","status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/igrigorik.png","metadata":{"files":{"readme":"README.md","changelog":null,"contributing":"CONTRIBUTING.md","funding":null,"license":"LICENSE","code_of_conduct":null,"threat_model":null,"audit":null,"citation":null,"codeowners":null,"security":null,"support":null,"governance":null,"roadmap":null,"authors":null,"dei":null,"publiccode":null,"codemeta":null}},"created_at":"2014-03-02T23:08:04.000Z","updated_at":"2025-04-10T09:20:38.000Z","dependencies_parsed_at":"2023-02-13T22:01:37.661Z","dependency_job_id":"e040618c-9706-4f37-83f3-4bd8d1a265c9","html_url":"https://github.com/igrigorik/videospeed","commit_stats":null,"previous_names":[],"tags_count":11,"template":false,"template_full_name":null,"repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/igrigorik%2Fvideospeed","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/igrigorik%2Fvideospeed/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/igrigorik%2Fvideospeed/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/igrigorik%2Fvideospeed/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/igrigorik","download_url":"https://codeload.github.com/igrigorik/videospeed/tar.gz/refs/heads/master","host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":254149804,"owners_count":22022849,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2022-07-04T15:15:14.044Z","host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":[],"created_at":"2024-07-31T18:00:49.026Z","updated_at":"2025-05-14T13:03:29.616Z","avatar_url":"https://github.com/igrigorik.png","language":"JavaScript","funding_links":[],"categories":["JavaScript","others","Awesome Bilibili","General","Miscellaneous"],"sub_categories":["Other Tools"],"readme":"# The science of accelerated playback\n\n**TL;DR: faster playback translates to better engagement and retention.**\n\nThe average adult reads prose text at\n[250 to 300 words per minute](http://www.paperbecause.com/PIOP/files/f7/f7bb6bc5-2c4a-466f-9ae7-b483a2c0dca4.pdf)\n(wpm). By contrast, the average rate of speech for English speakers is ~150 wpm,\nwith slide presentations often closer to 100 wpm. As a result, when given the\nchoice, many viewers\n[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)\nto compensate for the difference.\n\nMany viewers report that\n[accelerated viewing keeps their attention longer](http://www.enounce.com/docs/BYUPaper020319.pdf):\nfaster delivery keeps the viewer more engaged with the content. In fact, with a\nlittle training many end up watching videos at 2x+ the recorded speed. Some\nstudies report that after being exposed to accelerated playback,\n[listeners become uncomfortable](http://alumni.media.mit.edu/~barons/html/avios92.html#beasleyalteredspeech)\nif they are forced to return to normal rate of presentation.\n\n## Faster HTML5 Video\n\nHTML5 video provides a native API to accelerate playback of any video. The\nproblem is many players either hide or limit this functionality. For the best\nresults, playback speed adjustments should be easy and frequent to match the pace\nand content being covered: we don't read at a fixed speed, and similarly, we\nneed an easy way to accelerate the video, slow it down, and quickly rewind the\nlast point to listen to it a few more times.\n\n![Player](https://cloud.githubusercontent.com/assets/2400185/24076745/5723e6ae-0c41-11e7-820c-1d8e814a2888.png)\n\n### _[Install Chrome Extension](https://chrome.google.com/webstore/detail/video-speed-controller/nffaoalbilbmmfgbnbgppjihopabppdk)_\n\n\\*\\* Once the extension is installed simply navigate to any page that offers\nHTML5 video ([example](http://www.youtube.com/watch?v=E9FxNzv1Tr8)), and you'll\nsee a speed indicator in top left corner. Hover over the indicator to reveal the\ncontrols to accelerate, slowdown, and quickly rewind or advance the video. Or,\neven better, simply use your keyboard:\n\n- **S** - decrease playback speed.\n- **D** - increase playback speed.\n- **R** - reset playback speed to 1.0x.\n- **Z** - rewind video by 10 seconds.\n- **X** - advance video by 10 seconds.\n- **G** - toggle between current and user configurable preferred speed.\n- **V** - show/hide the controller.\n\nYou can customize and reassign the default shortcut keys in the extensions\nsettings page as well as add additional shortcut keys to match your\npreferences. 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\nand click \"Add New\".\nAfter making changes or adding new settings, remember to refresh the video viewing page for them to take effect.\n\n![settings Add New shortcut](https://user-images.githubusercontent.com/121805/50726471-50242200-1172-11e9-902f-0e5958387617.jpg)\n\nUnfortunately, some sites may assign other functionality to one of the shortcut keys - this is inevitable. As a workaround, the extension\nlistens both for lower and upper case values (i.e. you can use\n`Shift-\u003cshortcut\u003e`) if there is other functionality assigned to the lowercase\nkey. This is not a perfect solution since some sites may listen to both, but it works\nmost of the time.\n\n### FAQ\n\n**The video controls are not showing up?** This extension is only compatible\nwith HTML5 video. If you don't see the controls showing up, chances are you are\nviewing a Flash video. If you want to confirm, try right-clicking on the video\nand inspect the menu: if it mentions flash, then that's the issue. That said,\nmost sites will fallback to HTML5 if they detect that Flash it not available.\nYou can try manually disabling Flash plugin in Chrome:\n\n- In a new tab, navigate to `chrome://settings/content/flash`\n- Disable \"Allow sites to run Flash\"\n- Restart your browser and try playing your video again\n\n**The speed controls are not showing up for local videos?** To enable playback\nof local media (e.g. File \u003e Open File), you need to grant additional permissions\nto the extension.\n\n- In a new tab, navigate to `chrome://extensions`\n- Find \"Video Speed Controller\" extension in the list and enable \"Allow access\n  to file URLs\"\n- Open a new tab and try opening a local file; the controls should show up.\n\n### License\n\n(MIT License) - Copyright (c) 2014 Ilya Grigorik\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Figrigorik%2Fvideospeed","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Figrigorik%2Fvideospeed","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Figrigorik%2Fvideospeed/lists"}