What is Syncplay?
Syncplay is a tool that allows you to synchronize media players between multiple clients, which allows you to watch video files, that you and your friends have, together on different machines, without shouting 3.. 2.. 1.. every time someone takes a break for a second. It works by either one of the users providing a server on their local machine for the clients to join, or everyone joining a public server.
While setting up a server for your own is not that difficult, it's quite laborious to do it every time you want to watch something. Public servers are also rather rare and sometimes not reachable all the time. Plus some people would prefer to have their own server running anyways. So here's how!