index.js

/**
 * @description M3U8 to MP4 Converter
 * @author Furkan Inanc
 * @version 1.0.0
 */

let ffmpeg = require("fluent-ffmpeg");

/**
 * A class to convert M3U8 to MP4
 * @class
 */
class m3u8ToMp4Converter {
  /**
   * Sets the input file
   * @param {String} filename M3U8 file path. You can use remote URL
   * @returns {Function}
   */
  setInputFile(filename) {
    if (!filename) throw new Error("You must specify the M3U8 file address");
    this.M3U8_FILE = filename;

    return this;
  }

  /**
   * Sets the output file
   * @param {String} filename Output file path. Has to be local :)
   * @returns {Function}
   */
  setOutputFile(filename) {
    if (!filename) throw new Error("You must specify the file path and name");
    this.OUTPUT_FILE = filename;

    return this;
  }

  /**
   * Starts the process
   */
  start(options = {}) {
    // https://github.com/fluent-ffmpeg/node-fluent-ffmpeg#setting-event-handlers
    options = Object.assign({
      onStart: () => { },
      onEnd: () => { },
      onError: error => {
        reject(new Error(error));
      },
      onProgress: () => { },
      onStderr: () => { },
      onCodecData: () => { },
    }, options);
    
    return new Promise((resolve, reject) => {
      if (!this.M3U8_FILE || !this.OUTPUT_FILE) {
        reject(new Error("You must specify the input and the output files"));
        return;
      }

      ffmpeg(this.M3U8_FILE)
        .on('start', options.onStart)
        .on('codecData', options.onCodecData)
        .on('progress', options.onProgress)
        .on("error", options.onError)
        .on('stderr', options.onStderr)
        .on("end", (...args) => {
          resolve();
          options.onEnd(...args);
        })
        .outputOptions("-c copy")
        .outputOptions("-bsf:a aac_adtstoasc")
        .output(this.OUTPUT_FILE)
        .run();
    });
  }
}

module.exports = m3u8ToMp4Converter;