ffmpegwasm-v0.1.0-transcode.js

const fs = require('fs');
const { getModule } = require('./util/module');
const strList2ptr = require('./util/strList2ptr');

module.exports = (inputPath, outputExt) => {
  const Module = getModule();
  const data = new Uint8Array(fs.readFileSync(inputPath));
  const ffmpeg = Module.cwrap('ffmpeg', 'number', ['number', 'number']);
  const args = ['./ffmpeg', '-i', 'input.avi', `output.${outputExt}`];
  Module.FS.writeFile('input.avi', data);
  ffmpeg(args.length, strList2ptr(args));
  return Buffer.from(Module.FS.readFile(`output.${outputExt}`));
};