Node.js Static File + Media Streaming Server

mediaserver.js

    /**
    * 1. install nodejs from https://nodejs.org/en/download/
    * 2. run `npm install -g serve-static filehandler serve-index` in terminal
    * 3. run `node mediaserver.js`
    */
    var http = require('http'),
        fs = require('fs'),
        util = require('util'),
        url = require('url'),
        path = require('path'),
        serveStatic = require('serve-static'),
        finalhandler = require('finalhandler'),
        ip = require('ip');
    var serveIndex = require('serve-index')
    var port = 1337;
    var serve = serveStatic(__dirname + '/');
    var index = serveIndex(__dirname + '/', {
        'icons': true
    });

    function returnMedia(fpath, req, res, stat) {
        var total = stat.size;
        var ext = path.extname(fpath).slice(1);
        if (req.headers['range']) {
            var range = req.headers.range;
            var parts = range.replace(/bytes=/, "").split("-");
            var partialstart = parts[0];
            var partialend = parts[1];
            var start = parseInt(partialstart, 10);
            var end = partialend ? parseInt(partialend, 10) : total - 1;
            var chunksize = (end - start) + 1;
            console.log('RANGE: ' + start + ' - ' + end + ' = ' +
                chunksize);
            var file = fs.createReadStream(fpath, {
                start: start,
                end: end
            });
            res.writeHead(206, {
                'Content-Range': 'bytes ' + start + '-' + end +
                    '/' + total,
                'Accept-Ranges': 'bytes',
                'Content-Length': chunksize,
                'Content-Type': 'video/' + ext
            });
            file.pipe(res);
        } else {
            console.log('ALL: ' + total);
            res.writeHead(200, {
                'Content-Length': total,
                'Content-Type': 'video/' + ext
            });
            fs.createReadStream(fpath).pipe(res);
        }
    }

    http.createServer(function(req, res) {
        if (req.url == '/index.html' || req.url == '/') {
            console.log(req.url);
            return index(req, res, finalhandler(req, res));
        } else {
            var urlParts = url.parse(req.url, true);
            var fpath = decodeURIComponent(urlParts.pathname.slice(1));
            try {
                var stat = fs.statSync(fpath);
            } catch (err) {
                console.log(err);
                return
            }
            if (stat.isDirectory()) {
                return index(req, res, finalhandler(req, res));
            } else {
                switch (path.extname(fpath)) {
                    case '.avi':
                    case '.webm':
                    case '.gif':
                    case '.ogg':
                    case '.ogv':
                    case '.mov':
                    case '.mp4':
                    case '.rmvb':
                    case '.m4v':
                    case '.mkv':
                        return returnMedia(fpath, req, res, stat);
                    default:
                        return serve(req, res, finalhandler(req, res));
                }
            }
        }
    }).listen(port, "0.0.0.0", function() {
        console.log('Server running at http://' + ip.address() + ':' +
            port + '/');
    });

I want to stream an mkv in firefox any ideas?
I know it can be done using FFmpeg to pipe it to an rstp:// or rtmp://.
But I want to create a m3u8 stream.