Added MKV muxing support

src/video/index.js

@@ -1,3 +1,4 @@
 module.exports = {
+  merge: require('./merge'),
   stream: require('./stream')
 };

src/video/merge.js

@@ -0,0 +1,39 @@
+'use strict';
+var childProcess = require('child_process');
+var fs = require('fs');
+var path = require('path');
+var os = require('os');
+
+/**
+ * Merges the subtitle and video files into a Matroska Multimedia Container.
+ * @param {Object} config
+ * @param {string} rtmpInputPath
+ * @param {string} filePath
+ * @param {function(Error)} done
+ */
+module.exports = function(config, rtmpInputPath, filePath, done) {
+  var subtitlePath = filePath + '.' + config.format;
+  var videoPath = filePath + path.extname(rtmpInputPath);
+  childProcess.exec(_command() + ' ' +
+    '-o "' + filePath + '.mkv" ' +
+    '"' + videoPath + '" ' +
+    '"' + subtitlePath + '"', {
+    maxBuffer: Infinity
+  }, function(err) {
+    if (err) return done(err);
+    fs.unlink(videoPath, function(err) {
+      if (err) return done(err);
+      fs.unlink(subtitlePath, done);
+    });
+  });
+};
+
+/**
+ * Determines the command for the operating system.
+ * @private
+ * @returns {string}
+ */
+function _command() {
+  if (os.platform() !== 'win32') return 'mkvmerge';
+  return path.join(__dirname, '../../bin/mkvmerge.exe');
+}

src/video/stream.js

@@ -23,6 +23,7 @@ module.exports = function(rtmpUrl, rtmpInputPath, swfUrl, filePath, done) {
 
 /**
  * Determines the command for the operating system.
+ * @private
  * @returns {string}
  */
 function _command() {