Nageru (投げる), a modern free software video mixer

Nageru user interface

Nageru (a pun on the Japanese verb nageru, meaning to throw or cast) is a live video mixer. It takes in inputs from one or more video cards (any DeckLink PCI card via Blackmagic's drivers, and Intensity Shuttle USB3 and UltraStudio SDI USB3 cards via bmusb), mixes them together based on the operator's desire and a theme written in Lua, and outputs a high-quality H.264 stream over TCP suitable for further transcoding and/or distribution. Nageru is free software, licensed under the GNU General Public License, version 3 or later.

Nageru aims to produce high-quality output, both in terms of audio and video, while still running on modest hardware. The reference system for two 720p60 inputs is a ThinkPad X240, ie. an ultraportable dual-core with a not-very-fast GPU. Nageru's performance scales almost linearly with the available GPU power; e.g., if you have a GPU that's twice as fast as mine (which is not hard to find at all these days; desktop GPUs are frequently more like 10x), going to 1080p60 will only cost you about 10% more CPU power.

Then there's also stuff from my FOSDEM talk, although it covers only 1.0.0 and a lot of things have happened since then:

The stream at Solskogen 2016 was produced with Nageru (in collaboration with other software and some hardware); you can view a copy of the streams at YouTube (although YouTube doesn't seem to deal properly with 50/60 fps switches, causing jerkiness in some videos).

Contact information at my home page.