What is Livestreamer?
Livestreamer is a command-line utility that pipes video streams from various services into a video player, such as VLC. The main purpose of Livestreamer is to allow the user to avoid buggy and CPU heavy flash plugins but still be able to enjoy various streamed content. There is also an API available for developers who want access to the video stream data.
Livestreamer is built upon a plugin system which allows support for new services to be easily added. Currently most of the big streaming services are supported, such as:
Dailymotion Livestream Twitch UStream YouTube Live ... and many more. A full list of plugins currently included can be found on the Plugins page.
The project seems to be no longer updated since 2016. Last version, 1.12.2, released in May 2015, but it can be still downloaded from GitHub