VideoSynchronizer flicker outside of video duration

Just wondering if what I’m seeing with VideoSynchronizer is expected behavior for a video overlay. When you use VideoSynchronizer with a set epoch and set not to repeat you get a continuous flicker between the beginning and end of the video when outside of the video duration. I assume this has to do something with the tolerance property of the VideoSynchronizer? You can reproduce this in the Video sandcastle example by adding the following on line 4 and clicking on the ‘Toggle clock synchronization’ and ‘Toggle Video Overlay’ button.

videoElement.loop = false;


Thanks for reporting this! This looks like a bug in Cesium. I’ve submitted an issue to fix it here:



Thanks for the confirmation!