44 lines
1.5 KiB
Markdown
44 lines
1.5 KiB
Markdown
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# AJA Video Cards ❤️ Nix
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This repo contains a Nix flake containing the open source AJA driver, utilities and
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gstreamer plugin. This allows you to use Aja video IO cards on NixOS.
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## Usage
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- Add the flake to your system flake's inputs.
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- Apply the overlay to your system's nixpkgs, e.g.
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```nix
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nixpkgs.overlays = [ ajantv2.overlays.default ];
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```
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- Add the kernel driver:
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```nix
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# Include the kernel module
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boot.extraModulePackages = [pkgs.ajantv-driver];
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# And load it automatically
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boot.kernelModules = [ "ajantv2" ];
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```
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- Include the utils/demos and gstreamer plugin:
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```nix
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environment.systemPackages = [pkgs.ajantv-utils pkgs.aja-ntv2-gst]
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```
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## Gstreamer
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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`
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NB: You must select the video mode to match what's on the input. Otherwise you will see
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something like:
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```
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Setting pipeline to PAUSED ...
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Pipeline is live and does not need PREROLL ...
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Pipeline is PREROLLED ...
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Setting pipeline to PLAYING ...
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New clock: GstSystemClock
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WARNING: from element /GstPipeline:pipeline0/GstAjaVideoSrc:ajavideosrc0: Signal lost
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Additional debug info:
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gstajavideosrc.cpp(1324): gst_aja_video_src_create (): /GstPipeline:pipeline0/GstAjaVideoSrc:ajavideosrc0:
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No input source was detected - video frames invalid
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```
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You can find all the supported video modes with: `gst-inspect-1.0 ajavideosrc`.
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