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, optional 10-bit input and output support. - Proper sound support: Syncing of multiple unrelated sources through high-quality resampling, multichannel mixing with separate effects per-bus, cue out for headphones, dynamic range compression, three-band graphical EQ (pluss a fixed low-cut), level meters conforming to EBU R128, automation via MIDI controllers. - 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. - HTML rendering (through Chromium Embedded Framework), for high-quality and flexible overlay or other graphics. - Comprehensive monitoring through Prometheus metrics. [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 currently needs: - An Intel processor with Intel Quick Sync, or otherwise some hardware H.264 encoder exposed through VA-API. Note that you can use VA-API over DRM instead of X11, to use a non-Intel GPU for rendering but still use Quick Sync (Nageru does this automatically for you if needed). - Two or more Blackmagic USB3 or PCI cards, either HDMI or SDI. The PCI cards need Blackmagic's own drivers installed. The USB3 cards are driven through the “bmusb” driver, using libusb-1.0. If you want zerocopy USB, you need libusb 1.0.21 or newer, as well as a recent kernel (4.6.0 or newer). Zerocopy USB helps not only for performance, but also for stability. You need at least version 0.7.3. - Movit, my GPU-based video filter library (https://movit.sesse.net). You will need at least version 1.5.2. - Qt 5.5 or newer for the GUI. - QCustomPlot for the histogram display in the frame analyzer. - libmicrohttpd for the embedded web server. - x264 for encoding high-quality video suitable for streaming to end users. - ffmpeg for muxing, and for encoding audio. You will need at least version 3.1. - Working OpenGL; Movit works with almost any modern OpenGL implementation. Nageru has been tested with Intel on Mesa (you want 11.2 or newer, due to critical stability bugfixes), and with NVIDIA's proprietary drivers. The status of AMD's proprietary drivers is currently unknown. - libzita-resampler, for resampling sound sources so that they are in sync between sources, and also for oversampling for the peak meter. - LuaJIT, for driving the theme engine. - Meson, for building. - Optional: CEF (Chromium Embedded Framework), for HTML graphics. If you build without CEF, the HTMLInput class will not be available from the theme. You can get binary downloads of CEF from http://opensource.spotify.com/cefbuilds/index.html Simply download the right build for your platform (the “minimal” build is fine) and add -Dcef_dir=/cef_binary_X.XXXX.XXXX.XXXXXXXX_linux64 on the meson command line (substituting X with the real version as required). If on Debian stretch or something similar, you can install everything you need with: apt install qtbase5-dev libqt5opengl5-dev qt5-default libqcustomplot-dev \ pkg-config libmicrohttpd-dev libusb-1.0-0-dev libluajit-5.1-dev \ libzita-resampler-dev libva-dev libavcodec-dev libavformat-dev \ libswscale-dev libavresample-dev libmovit-dev libegl1-mesa-dev \ libasound2-dev libx264-dev libbmusb-dev protobuf-compiler \ libprotobuf-dev meson Exceptions as of November 2018: - You will need Movit from testing or unstable; stretch only has 1.4.0. - You will need bmusb from testing or unstable; stretch only has 0.5.4. - You will need a Meson backport; the version in stretch is too old. - Debian does not carry CEF (but it is optional). You can get experimental (and not security-supported) CEF Debian packages built for unstable at http://storage.sesse.net/cef/, and then configure Nageru with meson obj -Dcef_dir=/usr/lib/x86_64-linux-gnu/cef -Dcef_build_type=system -Dcef_no_icudtl=true The patches/ directory contains a patch that helps zita-resampler performance. It is meant for upstream, but was not in at the time Nageru was released. It is taken to be by Steinar H. Gunderson (ie., my ex-work email), and under the same license as zita-resampler itself. Nageru uses Meson to build. For a default build, type meson obj && cd obj && ninja To start it, just hook up your equipment, and then type “./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 nut mux (e.g. http://127.0.0.1:9095/stream.nut). 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. If you have a fast CPU (typically a quadcore desktop; most laptops will spend most of their CPU on running Nageru itself), you can use x264 for the outgoing stream instead of Quick Sync; it is much better quality for the same bitrate, and also has proper bitrate controls. Simply add --http-x264-video on the command line. (You may also need to add something like "--x264-preset veryfast", since the default "medium" preset might be too CPU-intensive, but YMMV.) The stream saved to disk will still be the Quick Sync-encoded stream, as it is typically higher bitrate and thus also higher quality. Note that if you add ".metacube" at the end of the URL (e.g. "http://127.0.0.1:9095/stream.ts.metacube"), you will get a stream suitable for streaming through the Cubemap video reflector (cubemap.sesse.net). A typical example would be: ./nageru --http-x264-video --x264-preset veryfast --x264-tune film \ --http-mux mp4 --http-audio-codec libfdk_aac --http-audio-bitrate 128 If you are comfortable with using all your remaining CPU power on the machine for x264, try --x264-speedcontrol, which will try to adjust the preset dynamically for maximum quality, at the expense of somewhat higher delay. See --help for more information on options in general. 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, full documentation and link to the latest version. Legalese: TL;DR: Everything is GPLv3-or-newer compatible, and see Intel's copyright license at quicksync_encoder.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 quicksync_encoder.h and quicksync_encoder.cpp: Copyright (c) 2007-2013 Intel Corporation. All Rights Reserved. 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Marked parts of theme.cpp (Lua shims): The MIT License (MIT) Copyright (c) 2013 Hisham Muhammad Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 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