Nageru is a live video mixer, based around the standard M/E workflow. Features: - High performance on modest hardware (720p60 with two input streams on my Thinkpad X240[1]); almost all pixel processing is done on the GPU. - High output quality; Lanczos3 scaling, subpixel precision everywhere, white balance adjustment, mix of 16- and 32-bit floating point for intermediate calculations, dithered output. - Proper sound support: Syncing of multiple unrelated sources through high-quality resampling, freely selectable input, cue out for headphones, dynamic range compression, simple EQ (lowpass), level meters conforming to EBU R128. - Theme engine encapsulating the design demands of each individual event; Lua code is responsible for setting up the pixel processing pipelines, running transitions etc., so that the visual look is consistent between operators. [1] For reference, that is: Core i7 4600U (dualcore 2.10GHz, clocks down to 800 MHz after 30 seconds due to thermal constraints), Intel HD Graphics 4400 (ie., without the extra L4 cache from Iris Pro), single-channel DDR3 RAM (so 12.8 GB/sec theoretical memory bandwidth, shared between CPU and GPU). Nageru is in beta stage. It currently needs: - An Intel processor with Intel Quick Sync, or otherwise some hardware H.264 encoder exposed through VA-API. - Two or more Blackmagic USB3 cards, either HDMI or SDI. These are driven through the “bmusb” driver embedded in bmusb/, using libusb-1.0. Note that you will want a recent Linux kernel to avoid LPM (link power management) and bandwidth allocation issues with USB3. - Movit, my GPU-based video filter library (https://movit.sesse.net). You will need at least version 1.3.0. - Qt 5.5 or newer for the GUI. - libmicrohttpd for the embedded web server. - ffmpeg for muxing, and for encoding audio. - Working OpenGL; Movit works with almost any modern OpenGL implementation, but Nageru has been tested with Mesa 10.x and 11.x only (you probably want 11.x). - libzita-resampler, for resampling sound sources so that they are in sync between sources, and also for oversampling for the peak meter. - Lua, for driving the theme engine. If on Debian sid or something similar (or stretch, once Movit 1.3.0 migrates), you can install everything you need with: git submodule update --init apt install qtbase5-dev qt5-default pkg-config libmicrohttpd-dev \ libusb-1.0-0-dev liblua5.2-dev libzita-resampler-dev libva-dev \ libavcodec-dev libavformat-dev libswscale-dev libmovit-dev \ libegl1-mesa-dev libasound2-dev The patches/ directory contains some patches for upstream software that help Nageru performance and/or stability. They are all meant for upstream, but probably will not be in by the time Nageru is released. All except the bmusb patch are taken to be by Steinar H. Gunderson (ie., my work email, unlike Nageru itself and bmusb), and under the same license as the projects they patch. To start it, just hook up your equipment, type “make” and then “./nageru”. It is strongly recommended to have the rights to run at real-time priority; it will make the USB3 threads do so, which will make them a lot more stable. (A reasonable hack for testing is probably just to run it as root using sudo, although you might not want to do that in production.) Note also that if you are running a desktop compositor, it will steal significant amounts of GPU performance. The same goes for PulseAudio. Nageru will open a HTTP server at port 9095, where you can extract a live H264+PCM signal in QuickTime mux (e.g. http://127.0.0.1:9095/stream.mov). It is probably too high bitrate (~25 Mbit/sec depending on content) to send to users, but you can easily send it around in your internal network and then transcode it in e.g. VLC. A copy of the stream (separately muxed) will also be saved live to local disk. The name “Nageru” is a play on the Japanese verb 投げる (nageru), which means to throw or cast. (I also later learned that it could mean to face defeat or give up, but that's not the intended meaning.) Nageru's home page is at https://nageru.sesse.net/, where you can also find contact information and link to the latest version. Legalese: TL;DR: Everything is GPLv3-or-newer compatible, and see Intel's copyright license at h264encode.h. Nageru is Copyright (C) 2015 Steinar H. Gunderson . Portions Copyright (C) 2003 Rune Holm. Portions Copyright (C) 2010-2015 Fons Adriaensen . Portions Copyright (C) 2012-2015 Fons Adriaensen . Portions Copyright (C) 2008-2015 Fons Adriaensen . Portions Copyright (c) 2007-2013 Intel Corporation. All Rights Reserved. This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see . Portions of h264encode.h and h264encode.cpp: Copyright (c) 2007-2013 Intel Corporation. All Rights Reserved. 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