Spawn, play video from stdout to stdin

Using nodejs, I'm trying to play a youtube clip in MPlayer by streaming video from youtube-dl. MPlayer stops playing after a few seconds as a standard, and whenever I'm trying to switch video (demonstrated by the timeout) everything crashes.

I feel as if I need some help to sort this out. Not sure what's going wrong. I would also prefer it if I could have one process with MPlayer and not having to restart it each time.

One error upon calling player.play(...) again:

events.js:85
      throw er; // Unhandled 'error' event
            ^
Error: write EPIPE
    at exports._errnoException (util.js:746:11)
    at WriteWrap.afterWrite (net.js:775:14)

Code:

var spawn = require('child_process').spawn;
var player = new Player();
player.play('http://ift.tt/WvL51I');

var testingPlayNext = setTimeout(function() {
    player.play('http://ift.tt/WvL51I');
}, 3000);


function Player() {
    this.process = {
        dl: '',
        player: ''
    };
};

Player.prototype.play = function(url) {
    if (typeof this.process !== 'undefined' && this.process.dl) {
        this.stop();
    }

    this.process.player = spawn('mplayer', ['-']);
    this.process.dl = spawn('youtube-dl', [url, '-o', '-']);

    var that = this;
    this.process.dl.stdout.on('data', function(data) {
        that.process.player.stdin.write(data);
    });
};

Player.prototype.stop = function() {
    for (var prop in this.process) {
        try {
            this.process[prop].kill();
        } catch (e) {
            console.log('Error killing processes.', e);
        }
    }
};

process.on('exit', function() {
    player.stop();
});