Prefer MP4 over WebM because IE can't play webm apparently

lib/get-info.js

@@ -15,10 +15,10 @@ var ffmpeg = require("./ffmpeg");
  * Prefer WebM over MP4, ignore other codecs (e.g. FLV)
  */
 const GOOGLE_PREFERENCE = {
-    "hd1080": [46, 37],
-    "hd720": [45, 22],
-    "large": [44, 59],
-    "medium": [43, 18, 34] // 34 is 360p FLV as a last-ditch
+    "hd1080": [37, 46],
+    "hd720": [22, 45],
+    "large": [59, 44],
+    "medium": [18, 43, 34] // 34 is 360p FLV as a last-ditch
 };
 
 const CONTENT_TYPES = {