You can add the ffmpeg build extension to your build process: 
import { defineConfig } from "@trigger.dev/sdk/v3";
import { ffmpeg } from "@trigger.dev/build/extensions/core";

export default defineConfig({
  project: "<project ref>",
  // Your other config settings...
  build: {
    extensions: [ffmpeg()],
  },
});
By default, this will install the version of ffmpeg that is available in the Debian package manager (via apt).

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FFmpeg 7.x (static build)

If you need FFmpeg 7.x, you can pass { version: "7" } to the extension. This will install a static build of FFmpeg 7.x instead of using the Debian package: 
import { defineConfig } from "@trigger.dev/sdk/v3";
import { ffmpeg } from "@trigger.dev/build/extensions/core";

export default defineConfig({
  project: "<project ref>",
  // Your other config settings...
  build: {
    extensions: [ffmpeg({ version: "7" })],
  },
});
This extension will also add the FFMPEG_PATH and FFPROBE_PATH to your environment variables, making it easy to use popular ffmpeg libraries like fluent-ffmpeg. Note that fluent-ffmpeg needs to be added to external in your trigger.config.ts file. Follow this example to get setup with Trigger.dev and FFmpeg in your project.