node ./dlna_streamer.js video.mp4

dlna_streamer.js

#!/usr/bin/env node
const fs = require('fs');
const os = require('os');
const path = require('path');

const dlnacasts = require('dlnacasts')();
const express = require('express');
const mime = require('mime-types');
const tmp = require('tmp');

process.on('SIGINT', () => {
    dlnacasts.players.forEach(player => player.stop());
    setTimeout(process.exit, 1000);
});

if (['http', 'https'].indexOf(process.argv[2].split(':')[0]) !== -1) {
    const filePath = process.argv[2];
    const basename = path.basename(filePath);
    const extname = path.extname(filePath);
    const mimeType = mime.contentType(extname);

    dlnacasts.on('update', player => {
        console.log(player);
        player.play(filePath, { title: basename, type: mimeType });
    });
} else {
    const filePath = path.resolve(process.argv[2]);
    const basename = path.basename(filePath);
    const extname = path.extname(filePath);
    const mimeType = mime.contentType(extname);

    const tmpDir = tmp.dirSync().name;
    fs.symlinkSync(filePath, path.join(tmpDir, `video${extname}`));

    const app = express();
    app.use(express.static(tmpDir));
    const listener = app.listen(0);

    const address = [].concat.apply([], Object.values(os.networkInterfaces())).filter(details => details.family === 'IPv4' && details.internal === false)[0].address;
    const port = listener.address().port;

    dlnacasts.on('update', player => {
	console.log(player);
	player.play(`http://${address}:${port}/video${extname}`, { title: basename, type: mimeType });
    });
}

setInterval(dlnacasts.update, 125);