- 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
+ dynamic range compression, simple EQ (low-cut), level meters conforming
to EBU R128.
- Theme engine encapsulating the design demands of each individual
- 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 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.
+ If you want zerocopy USB, you need libusb 1.0.21-rc1 or newer,
+ as well as a recent kernel (4.6.0 or newer). Zerocopy USB helps not only
+ for performance, but also for stability.
- Movit, my GPU-based video filter library (https://movit.sesse.net).
You will need at least version 1.3.1.
- libmicrohttpd for the embedded web server.
- - x264 for encoding high-quality video suitable for streaming to end users
- (but see below).
+ - x264 for encoding high-quality video suitable for streaming to end users.
- - ffmpeg for muxing, and for encoding audio.
+ - 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 10.x and 11.x (you probably want
- 11.x), and with NVIDIA's proprietary drivers. AMD's proprietary drivers
- (fglrx) are known not to work due to driver bugs; I am in contact with
- AMD to try to get this resolved.
+ 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.
+ AMD's proprietary drivers (fglrx) are known not to work due to driver bugs;
+ I am in contact with AMD to try to get this resolved.
- libzita-resampler, for resampling sound sources so that they are in sync
between sources, and also for oversampling for the peak meter.
libavcodec-dev libavformat-dev libswscale-dev libavresample-dev \
libmovit-dev libegl1-mesa-dev libasound2-dev libx264-dev
+Exceptions as of July 2016:
-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 <sesse@google.com> (ie., my work
-email, unlike Nageru itself and bmusb), and under the same license as the
-projects they patch.
+ - libusb 1.0.21-rc1 is not yet in stretch or sid; you need to fetch it
+ from experimental.
+
+
+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 <sesse@google.com> (ie., my ex-work
+email), and under the same license as zita-resampler itself.
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;
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. Simple add --http-x264-video on the
+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). See --help for more information on options in general.
+(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
projects / nageru / blobdiff