Spacecap

A hardware accelerated replay capture tool focused on performance. Currently only supports Linux.

This is currently in the very early stages of development.

• Written in Zig.
• Hardware accelerated encoding with Vulkan Video (vulkan-zig).
• UI built with imgui/SDL3.

Why you might want to use this?

You play games on Linux and are looking for a light weight and performant alternative to OBS for capturing video replays.

What currently is working?

• Linux
  • Select desktop/window.
  • Video capture preview on UI.
  • Replay buffer with last n seconds of video/audio.
  • Output to .mp4 file.
  • Global keybinds via desktop portal.
• Windows
  • Binaries are built for Windows, but capture has not been implemented yet.

NOTE: I'm testing with an RTX 3080 GPU. I have no idea if AMD works. I don't have one to test on.

Linux Requirements

• vulkan (and related graphics drivers)
• pipewire
• pipewire-pulse

Installation

NOTE: A reboot may be required.

NixOS

There is currently not a Nix package published, but for now you can use appimage-run to execute the appimage.

TODO: Add vulkan instructions.

{...}: {
  security.rtkit.enable = true;

  services.pipewire = {
    enable = true;
    alsa.enable = false;
    pulse.enable = true;
    wireplumber.enable = true;
  };

  environment.systemPackages = with pkgs; [
    appimage-run
  ];
}

Arch

TODO: Add vulkan instructions.

sudo pacman -S --needed wireplumber pipewire pipewire-pulse pipewire-alsa fuse3
systemctl --user --now enable pipewire pipewire-pulse wireplumber

Ubuntu

TODO: Add vulkan instructions.

sudo apt update
sudo apt install wireplumber pipewire pipewire-pulse pipewire-alsa fuse3
systemctl --user --now enable pipewire pipewire-pulse wireplumber

Development

Nix is required for development, unless you want to install all dependencies manually. See flake.nix if you'd like to do so.

# Build
nix develop -c zig build -Dnix

# Run
nix develop -c zig build run -Dnix

# Test
nix develop -c zig build test -Dnix

Early Screenshot

Roadmap

• Set up pipeline to build and distribute binaries (appimage).
• Audio recording.
• Global keybinds
• Screenshots.
• Show video preview on UI - #9
• Video Player.
  • Simple video editor (trim start/end).
• Convert video output (mp4, gif, etc.).
• Linux capture.
• Windows capture.