I have found some references to an issue with embedded Vimeo videos creating a duplicate audio track when the autoplay value is set to 1. This appears to be specific to IE11. When the video loads, you can hear the audio track playing twice, the second lagging slightly behind the first. Closing the video window will silence one audio track, but the second continues to play to completion.
I may be searching inefficiently, but I am not able find a solution to this. Can anyone point me to a more detailed thread about this potential issue? Looking for a workaround other than disabling the auto-play.
Thanks!