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Groove with your friends: sync up listening to the same stuff on YouTube, Twitch, MixCloud, and SoundCloud.

Ever want to listen to a mix on the internet with a friend, and keep having to do things like "OK, hit play in 5
4
3" or "What timestamp are you at?"?

Then this plugin is for you!

For YouTube, MixCloud, and SoundCloud, a button will show up in the URL bar, which will create a URL and put it in your clipboard. You can then paste this URL to your friend and they will get redirected in such a way that they will sync up with you. Well, give or take a second or two, depending on how long the page takes for them to load.

Note: Currently MixCloud isn't quite working how I'd like, because they don't support having a timestamp in the URL, but there is a workaround using a page with a MixCloud widget.

How it works: when you hit the button, the URL of the currently playing video/audio is extracted, along with the current timestamp. The plugin then calculates a "zero" time by subtracting the current timestamp from the current time according to your clock. That zero time and the URL are encoded into the URL you can share. When someone clicks on the URL, the server will subtract the zero time from the current time, and append to the URL the difference so that the music will start playing at that offset.

Thanks to Martijn Bogaard for the icons!