From 774785c648058706dc65d7750d22cded6629fa6c Mon Sep 17 00:00:00 2001
From: George Politis <gp@jitsi.org>
Date: Mon, 20 Oct 2014 11:50:15 +0200
Subject: [PATCH] Attempts to prevent blackness when switching simulcast
 streams.

---
 index.html     | 3 ++-
 videolayout.js | 8 +++++++-
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/index.html b/index.html
index 8171f3f3e..e961fa68c 100644
--- a/index.html
+++ b/index.html
@@ -47,7 +47,7 @@
     <script src="analytics.js?v=1"></script><!-- google analytics plugin -->
     <script src="rtp_sts.js?v=3"></script><!-- RTP stats processing -->
     <script src="local_sts.js?v=2"></script><!-- Local stats processing -->
-    <script src="videolayout.js?v=18"></script><!-- video ui -->
+    <script src="videolayout.js?v=19"></script><!-- video ui -->
     <script src="connectionquality.js?v=1"></script>
     <script src="toolbar.js?v=6"></script><!-- toolbar ui -->
     <script src="toolbar_toggler.js?v=2"></script>
@@ -249,6 +249,7 @@
                 <a target="_new"><div class="watermark leftwatermark"></div></a>
                 <a target="_new"><div class="watermark rightwatermark"></div></a>
                 <a class="poweredby" href="http://jitsi.org" target="_new" >powered by jitsi.org</a>
+                <video id="preload" style="display: none"></video>
                 <video id="largeVideo" autoplay oncontextmenu="return false;"></video>
             </div>
             <div id="remoteVideos">
diff --git a/videolayout.js b/videolayout.js
index 63013d5b2..9d50b80d5 100644
--- a/videolayout.js
+++ b/videolayout.js
@@ -227,7 +227,13 @@ var VideoLayout = (function (my) {
                 if (fade) {
                     $('#largeVideo').fadeOut(300, doUpdate);
                 } else {
-                    doUpdate();
+                    $("#preload").attr("src", largeVideoState.newSrc);
+                    // The 'canplay' event occurs when the browser can start
+                    // playing the specified audio/video. See:
+                    // http://www.w3schools.com/tags/av_event_canplay.asp
+                    $("#preload").one("canplay",function(){
+                        doUpdate();
+                    });
                 }
             }
         }