FFprobe compiled to WebAssembly with TypeScript bindings. Probes a media File in a Web Worker. No setup, no worker wiring.

npm install ffprobe-ts

import { probe } from "ffprobe-ts";
import type {
  Disposition,
  FileResponse,
  Format,
  Rational,
  Stream,
  Tag,
} from "ffprobe-ts/types";

const result = await probe(file); // file: File (e.g. from <input type="file">)

if (result.error_code === 0) {
  console.log(result.response.format); // streams, chapters, format...
} else {
  console.error(result.error_message);
}

probe() lazily spawns a shared worker and reuses it. Call dispose() to terminate it. A non-zero error_code is a normal ffprobe answer (e.g. unsupported file), not a thrown error. The Promise only rejects if the worker itself crashes.

Types are exported from the package root and ffprobe-ts/types; the ffTime formatting helper from ffprobe-ts/helpers.