tweak implementation of #1376

1 files changed, 14 insertions, 2 deletions

diff --git a/js/reveal.js b/js/reveal.js
index c576c8c..e1d80b9 100644
--- a/js/reveal.js
+++ b/js/reveal.js
@@ -2728,8 +2728,20 @@
 			// Start video playback
 			var currentVideo = currentBackground.querySelector( 'video' );
 			if( currentVideo ) {
-				if( currentVideo.currentTime > 0 ) currentVideo.currentTime = 0;
-				currentVideo.play();
+
+				var startVideo = function() {
+					currentVideo.currentTime = 0;
+					currentVideo.play();
+					currentVideo.removeEventListener( 'loadeddata', startVideo );
+				};
+
+				if( currentVideo.readyState > 1 ) {
+					startVideo();
+				}
+				else {
+					currentVideo.addEventListener( 'loadeddata', startVideo );
+				}
+
 			}
 
 			var backgroundImageURL = currentBackground.style.backgroundImage || '';