diff --git a/Makefile b/Makefile
index 2f17f51..f593c0c 100644
--- a/Makefile
+++ b/Makefile
@@ -35,4 +35,4 @@ clean:
 nixify-zig-deps:
 	cd rose-zig && zon2nix > deps.nix
 
-.PHONY: build-zig check test typecheck lintcheck lint clean nixify-zig-deps
+.PHONY: help check build-zig test-py test-zig test typecheck lintcheck lint clean nixify-zig-deps
diff --git a/flake.lock b/flake.lock
index 488bea8..d3848f9 100644
--- a/flake.lock
+++ b/flake.lock
@@ -1,5 +1,26 @@
 {
   "nodes": {
+    "flake-parts": {
+      "inputs": {
+        "nixpkgs-lib": [
+          "zon2nix-src",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1698882062,
+        "narHash": "sha256-HkhafUayIqxXyHH1X8d9RDl1M2CkFgZLjKD3MzabiEo=",
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "rev": "8c9fa2545007b49a5db5f650ae91f227672c3877",
+        "type": "github"
+      },
+      "original": {
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "type": "github"
+      }
+    },
     "flake-utils": {
       "inputs": {
         "systems": "systems"
@@ -37,7 +58,8 @@
     "root": {
       "inputs": {
         "flake-utils": "flake-utils",
-        "nixpkgs": "nixpkgs"
+        "nixpkgs": "nixpkgs",
+        "zon2nix-src": "zon2nix-src"
       }
     },
     "systems": {
@@ -54,6 +76,27 @@
         "repo": "default",
         "type": "github"
       }
+    },
+    "zon2nix-src": {
+      "inputs": {
+        "flake-parts": "flake-parts",
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1715536407,
+        "narHash": "sha256-ow/4w6dV2fpi/dY2SHksDg2pZZwam3dH29bCyR92pmI=",
+        "owner": "azuline",
+        "repo": "zon2nix",
+        "rev": "88a009e478480c313ed9c013d3efac411557c9ae",
+        "type": "github"
+      },
+      "original": {
+        "owner": "azuline",
+        "repo": "zon2nix",
+        "type": "github"
+      }
     }
   },
   "root": "root",
diff --git a/flake.nix b/flake.nix
index 2fd5f7b..44004e7 100644
--- a/flake.nix
+++ b/flake.nix
@@ -4,12 +4,16 @@
   inputs = {
     nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
     flake-utils.url = "github:numtide/flake-utils";
+    # Bug in upstream: https://github.com/nix-community/zon2nix/pull/8.
+    zon2nix-src.url = "github:azuline/zon2nix";
+    zon2nix-src.inputs.nixpkgs.follows = "nixpkgs";
   };
 
   outputs =
     { self
     , nixpkgs
     , flake-utils
+    , zon2nix-src
     }:
     flake-utils.lib.eachDefaultSystem (system:
     let
@@ -52,6 +56,7 @@
       python-with-deps = python-pin.withPackages (_:
         pkgs.lib.attrsets.mapAttrsToList (a: b: b) py-deps
       );
+      zon2nix = zon2nix-src.packages.${system}.default;
     in
     {
       devShells.default = pkgs.mkShell {
@@ -73,13 +78,13 @@
         buildInputs = [
           (pkgs.buildEnv {
             name = "rose-devshell";
-            paths = with pkgs; [
+            paths = [
+              pkgs.ruff
+              pkgs.nodePackages.pyright
+              pkgs.nodePackages.prettier
+              pkgs.zig
+              pkgs.zls
               python-with-deps
-              ruff
-              nodePackages.pyright
-              nodePackages.prettier
-              zig
-              zls
               zon2nix
             ];
           })
diff --git a/rose-zig/build.zig b/rose-zig/build.zig
index 614c298..8306375 100644
--- a/rose-zig/build.zig
+++ b/rose-zig/build.zig
@@ -9,6 +9,10 @@ pub fn build(b: *std.Build) void {
         .target = target,
         .optimize = optimize,
     });
+    const ffmpeg = b.dependency("ffmpeg", .{
+        .target = target,
+        .optimize = optimize,
+    });
 
     // Specify the core library module.
     const rose = b.addModule("rose", .{
@@ -16,6 +20,7 @@ pub fn build(b: *std.Build) void {
         .target = target,
         .optimize = optimize,
         .imports = &[_]std.Build.Module.Import{
+            .{ .name = "av", .module = ffmpeg.module("av") },
             .{ .name = "sqlite", .module = sqlite.module("sqlite") },
         },
     });
diff --git a/rose-zig/build.zig.zon b/rose-zig/build.zig.zon
index 04a6fe7..e739b2b 100644
--- a/rose-zig/build.zig.zon
+++ b/rose-zig/build.zig.zon
@@ -6,6 +6,10 @@
             .url = "https://github.com/vrischmann/zig-sqlite/archive/dc339b7cf3bca82a12c2169231dd247587766781.tar.gz",
             .hash = "1220e0961c135c5aa3af77a043dbc5890a18235a157238df0e2882fe84a8c8439c7a",
         },
+        .ffmpeg = .{
+            .url = "https://github.com/andrewrk/ffmpeg/archive/1704e8898ea6217df91e6afc2a2de3f2b82a98d9.tar.gz",
+            .hash = "1220dd6f0bbf4614f338d632473e4b0a879ec26eca445ed305dcdbc6b5cb6405e3cd",
+        },
     },
     .paths = .{""},
 }
diff --git a/rose-zig/deps.nix b/rose-zig/deps.nix
index a6d7ce3..5ebb052 100644
--- a/rose-zig/deps.nix
+++ b/rose-zig/deps.nix
@@ -3,6 +3,55 @@
 { linkFarm, fetchzip }:
 
 linkFarm "zig-packages" [
+  {
+    name = "122004fa7e2ff0b3d472049743358f8fdf065cdf63bc0e5e3d54c6bb8d81d93e40da";
+    path = fetchzip {
+      url = "https://github.com/andrewrk/nasm/archive/b5f62392d56baf6aa02567f28e0da70664609262.tar.gz";
+      hash = "sha256-tPBQixxG+phvEfRHeOLHMjY1Ynp7r9zNSgRy4R/ILQM=";
+    };
+  }
+  {
+    name = "1220138f4aba0c01e66b68ed9e1e1e74614c06e4743d88bc58af4f1c3dd0aae5fea7";
+    path = fetchzip {
+      url = "https://github.com/allyourcodebase/zlib/archive/refs/tags/1.3.1-3.tar.gz";
+      hash = "sha256-R1tB+ORO3qeV/cNxsp5GqsiOyKUXjaj4Pd1v5AfWYz4=";
+    };
+  }
+  {
+    name = "122074e0bf09c3622780e697c11c6744e763dd63777e480baf2b583ee3ab6a02ff14";
+    path = fetchzip {
+      url = "https://github.com/andrewrk/libvorbis/archive/refs/tags/1.3.8-3.tar.gz";
+      hash = "sha256-KHKYT3tmab9qYu8N2iJwm1rS+mU7Cwnn8Jp0cfOdnIg=";
+    };
+  }
+  {
+    name = "12207d353609d95cee9da7891919e6d9582e97b7aa2831bd50f33bf523a582a08547";
+    path = fetchzip {
+      url = "https://github.com/madler/zlib/archive/refs/tags/v1.3.tar.gz";
+      hash = "sha256-eUuXV5zfy+fmiMNdWw5QCqDloBkaxy1tgi7by9nYHNA=";
+    };
+  }
+  {
+    name = "1220b3e1fb33317c92f9ead09630f6b4be59e80d0a8780754f8aa4ee7da61cb7b47a";
+    path = fetchzip {
+      url = "https://github.com/andrewrk/libogg/archive/refs/tags/1.3.6-2.tar.gz";
+      hash = "sha256-3dFDBo4Af58bW8Gf+sHLigwo8CO2siwzWWtAoYe5opI=";
+    };
+  }
+  {
+    name = "1220bee0fcf98bf6ad75b7bb09ff1f873ca38547a15b1e7a4532d20d94107d8d330a";
+    path = fetchzip {
+      url = "https://github.com/andrewrk/libmp3lame/archive/refs/tags/3.100.1-3.tar.gz";
+      hash = "sha256-kMI7JACnIVAdUHp5DUKx2XfKgIb1ftr6x/oYJdsTKyI=";
+    };
+  }
+  {
+    name = "1220dd6f0bbf4614f338d632473e4b0a879ec26eca445ed305dcdbc6b5cb6405e3cd";
+    path = fetchzip {
+      url = "https://github.com/andrewrk/ffmpeg/archive/1704e8898ea6217df91e6afc2a2de3f2b82a98d9.tar.gz";
+      hash = "sha256-6EYu1QT76cJQMW9F41DvXsVLulH1YwGrkhwSV6IsBes=";
+    };
+  }
   {
     name = "1220e0961c135c5aa3af77a043dbc5890a18235a157238df0e2882fe84a8c8439c7a";
     path = fetchzip {