stream_mux.js

/*
  Aerostat Beam Coder - Node.js native bindings for FFmpeg.
  Copyright (C) 2019  Streampunk Media Ltd.

  This program is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program.  If not, see <https://www.gnu.org/licenses/>.

  https://www.streampunk.media/ mailto:furnace@streampunk.media
  14 Ormiscaig, Aultbea, Achnasheen, IV22 2JJ  U.K.
*/

const beamcoder = require('../index.js');
const fs = require('fs');

async function run() {
  let demuxer = await beamcoder.demuxer('../../media/sound/BBCNewsCountdown.wav');

  let muxerStream = beamcoder.muxerStream({ highwaterMark: 65536 });
  muxerStream.pipe(fs.createWriteStream('test.wav'));

  let muxer = muxerStream.muxer({ format_name: 'wav' });
  let stream = muxer.newStream(demuxer.streams[0]); // eslint-disable-line
  // stream.time_base = demuxer.streams[0].time_base;
  // stream.codecpar = demuxer.streams[0].codecpar;
  await muxer.openIO();

  await muxer.writeHeader();
  let packet = {};
  for ( let x = 0 ; x < 10000 && packet !== null ; x++ ) {
    packet = await demuxer.read();
    if (packet)
      await muxer.writeFrame(packet);
  }
  await muxer.writeTrailer();
}

run();