feat: Adding new downloadAlternateFFmpeg option to download non-proprietary ffmpeg library

.changeset/honest-mugs-invite.md

@@ -0,0 +1,5 @@
+---
+"app-builder-lib": minor
+---
+
+feat: Adding new `downloadAlternateFFmpeg` option to download non-proprietary ffmpeg library

docs/configuration/configuration.md

@@ -102,6 +102,9 @@ Env file `electron-builder.env` in the current dir ([example](https://github.com
 <p><code id="Configuration-buildVersion">buildVersion</code> String | “undefined” - The build version. Maps to the <code>CFBundleVersion</code> on macOS, and <code>FileVersion</code> metadata property on Windows. Defaults to the <code>version</code>. If <code>buildVersion</code> is not defined and <code>buildNumber</code> (or one of the <code>buildNumber</code> envs) is defined, it will be used as a build version (<code>version.buildNumber</code>).</p>
 </li>
 <li>
+<p><code id="Configuration-downloadAlternateFFmpeg">downloadAlternateFFmpeg</code> Boolean - Whether to download the alternate FFmpeg library from Electron’s release assets and replace the default FFmpeg library prior to signing</p>
+</li>
+<li>
 <p><code id="Configuration-electronCompile">electronCompile</code> Boolean - Whether to use <a href="http://github.com/electron/electron-compile">electron-compile</a> to compile app. Defaults to <code>true</code> if <code>electron-compile</code> in the dependencies. And <code>false</code> if in the <code>devDependencies</code> or doesn’t specified.</p>
 </li>
 <li>

packages/app-builder-lib/package.json

@@ -61,6 +61,7 @@
     "chromium-pickle-js": "^0.2.0",
     "debug": "^4.3.4",
     "ejs": "^3.1.8",
+    "electron-packager-plugin-non-proprietary-codecs-ffmpeg": "^1.0.2",
     "electron-publish": "workspace:*",
     "form-data": "^4.0.0",
     "fs-extra": "^10.1.0",

packages/app-builder-lib/scheme.json

@@ -6666,6 +6666,10 @@
       ],
       "description": "macOS DMG options."
     },
+    "downloadAlternateFFmpeg": {
+      "description": "Whether to download the alternate FFmpeg library from Electron's release assets and replace the default FFmpeg library prior to signing",
+      "type": "boolean"
+    },
     "electronBranding": {
       "$ref": "#/definitions/ElectronBrandingOptions",
       "description": "The branding used by Electron's distributables. This is needed if a fork has modified Electron's BRANDING.json file."

packages/app-builder-lib/src/configuration.ts

@@ -144,6 +144,11 @@ export interface Configuration extends PlatformSpecificBuildOptions {
    */
   readonly buildVersion?: string | null
 
+  /**
+   * Whether to download the alternate FFmpeg library from Electron's release assets and replace the default FFmpeg library prior to signing
+   */
+  readonly downloadAlternateFFmpeg?: boolean
+
   /**
    * Whether to use [electron-compile](http://github.com/electron/electron-compile) to compile app. Defaults to `true` if `electron-compile` in the dependencies. And `false` if in the `devDependencies` or doesn't specified.
    */

packages/app-builder-lib/src/electron/ElectronFramework.ts

@@ -14,6 +14,7 @@ import { getTemplatePath } from "../util/pathManager"
 import { createMacApp } from "./electronMac"
 import { computeElectronVersion, getElectronVersionFromInstalled } from "./electronVersion"
 import * as fs from "fs/promises"
+import replaceFFMPEG from "electron-packager-plugin-non-proprietary-codecs-ffmpeg"
 
 export type ElectronPlatformName = "darwin" | "linux" | "win32" | "mas"
 
@@ -132,8 +133,12 @@ class ElectronFramework implements Framework {
     }
   }
 
-  prepareApplicationStageDirectory(options: PrepareApplicationStageDirectoryOptions) {
-    return unpack(options, createDownloadOpts(options.packager.config, options.platformName, options.arch, this.version), this.distMacOsAppName)
+  async prepareApplicationStageDirectory(options: PrepareApplicationStageDirectoryOptions) {
+    await unpack(options, createDownloadOpts(options.packager.config, options.platformName, options.arch, this.version), this.distMacOsAppName)
+    if (options.packager.config.downloadAlternateFFmpeg) {
+      log.info(null, "downloading non-proprietary FFMPEG, piping output")
+      await new Promise<void>(resolve => replaceFFMPEG(options.appOutDir, options.version, options.platformName, options.arch, resolve))
+    }
   }
 
   beforeCopyExtraFiles(options: BeforeCopyExtraFilesOptions) {