fix: Play WebM in Vivaldi

user/sweetbread/home.nix

@@ -1,4 +1,16 @@
-{ pkgs, lib, osConfig, ... }: {
+{ pkgs, lib, osConfig, ... }: let
+  # Match the Electron FFmpeg build recommended by Vivaldi 8.2.
+  vivaldiCodecs = pkgs.runCommand "vivaldi-ffmpeg-electron-44.4.2" {
+    nativeBuildInputs = [ pkgs.unzip ];
+  } ''
+    mkdir -p "$out/lib"
+    unzip -p ${pkgs.fetchurl {
+      url = "https://github.com/electron/electron/releases/download/v44.4.2/electron-v44.4.2-linux-x64.zip";
+      hash = "sha256-rXEGPnfaKaZH+HKwkEePn6nM/9Z957KuYxVAnPHxNDY=";
+    }} libffmpeg.so > "$out/lib/libffmpeg.so"
+    echo "39f63af3ef6f8db9eea20803c6f6dff8b2d5ad596d506ea1effb3f856715ac1c  $out/lib/libffmpeg.so" | sha256sum -c
+  '';
+in {
   imports = [
     ../../modules/user/lucid
     ./modules/lucid
@@ -12,6 +24,7 @@
     android-studio
     (vivaldi.override {
       proprietaryCodecs = true;
+      vivaldi-ffmpeg-codecs = vivaldiCodecs;
       enableWidevine = true;
     })
     weechat