Streamlink is a free and open-source command-line utility and a cross-platform application designed to stream live video streams and audio streams from various streaming services and media players. It can be used to watch online streams from various streaming services, such as YouTube, Twitch, Mixer, etc. Streamlink allows users to watch live streams in the highest possible quality, even if the source stream is of lower quality. Streamlink provides a powerful and reliable streaming experience, with support for many different streaming services and media players. Streamlink can also be used to record live streams, giving users the ability to save and watch their favorite videos and streams at any time. Additionally, Streamlink can be used to stream videos from local devices, such as a computer, smartphone, or tablet. Streamlink offers a wide range of features, such as the ability to select different audio and video codecs, and the ability to customize various streaming options.
Discontinued It seems that the project is no longer updated since 2016. Last version, 1.12.2, released in May 2015, but can still be downloaded from GitHub.