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readme.md

AJA Video Cards ❤️ Nix

This repo contains a Nix flake containing the open source AJA driver, utilities and gstreamer plugin. This allows you to use Aja video IO cards on NixOS.

Usage

Add the flake to your system flake's inputs.

Apply the overlay to your system's nixpkgs, e.g.

nixpkgs.overlays = [ ajantv2.overlays.default ];

Add the kernel driver:

# Include the kernel module 
boot.extraModulePackages = [pkgs.ajantv-driver];
# And load it automatically
boot.kernelModules = [ "ajantv2" ];

Include the utils/demos and gstreamer plugin:

environment.systemPackages = [pkgs.ajantv-utils pkgs.aja-ntv2-gst]

Gstreamer

Summon a quick network stream: gst-launch-1.0 ajavideosrc input-channel=0 mode=29 ! videoconvert ! jpegenc quality=20 ! multipartmux boundary="--videoboundary" ! tcpserversink host=0.0.0.0 port=6969

NB: You must select the video mode to match what's on the input. Otherwise you will see something like:

Setting pipeline to PAUSED ...
Pipeline is live and does not need PREROLL ...
Pipeline is PREROLLED ...
Setting pipeline to PLAYING ...
New clock: GstSystemClock
WARNING: from element /GstPipeline:pipeline0/GstAjaVideoSrc:ajavideosrc0: Signal lost
Additional debug info:
gstajavideosrc.cpp(1324): gst_aja_video_src_create (): /GstPipeline:pipeline0/GstAjaVideoSrc:ajavideosrc0:
No input source was detected - video frames invalid

You can find all the supported video modes with: gst-inspect-1.0 ajavideosrc.