saving speed if set before video is loaded, fixes #3113

Author: Lauren McCarthy

lib/addons/p5.dom.js

@@ -931,9 +931,14 @@
     elt.addEventListener('loadedmetadata', function() {
       c.width = elt.videoWidth;
       c.height = elt.videoHeight;
+      //c.elt.playbackRate = s;
       // set elt width and height if not set
       if (c.elt.width === 0) c.elt.width = elt.videoWidth;
       if (c.elt.height === 0) c.elt.height = elt.videoHeight;
+      if (c.presetPlaybackRate) {
+        c.elt.playbackRate = c.presetPlaybackRate;
+        delete c.presetPlaybackRate;
+      }
       c.loadedmetadata = true;
     });
 
@@ -2452,9 +2457,13 @@
    */
   p5.MediaElement.prototype.speed = function(val) {
     if (typeof val === 'undefined') {
-      return this.elt.playbackRate;
+      return this.presetPlaybackRate || this.elt.playbackRate;
     } else {
-      this.elt.playbackRate = val;
+      if (this.loadedmetadata) {
+        this.elt.playbackRate = val;
+      } else {
+        this.presetPlaybackRate = val;
+      }
     }
   };