refactored video frame capture

HISTORY.md

@@ -80,6 +80,7 @@
 
 ### 2019-05-15
 * Objects, Treads: refactored videoLayer so it can also be used for other extensions (maps, 3d)
+* Objects: refactored video frame capture
 
 ### 2019-05-14
 * Objects: fixed originalCloneName reference when setting a new parent

src/objects.js

@@ -7536,8 +7536,13 @@ StageMorph.prototype.step = function () {
     }
 
     // video frame capture
+    this.stepVideo();
+};
+
+StageMorph.prototype.stepVideo = function () {
+    var context;
     if (this.videoElement) {
-        var context = this.projectionLayer().getContext('2d');
+        context = this.projectionLayer().getContext('2d');
         context.save();
         if (this.mirrorVideo) {
             context.translate(this.dimensions.x, 0);