Hi,
I have successfully put youtube videos within a image slider in LayerSlider WP. But when I am trying a self hosted video (both in MP4 & FLV format - 50 seconds length) it is only showing a grey screen in place of video for 50 seconds. Rest of the image slider working properly. Is their any specification in case of a self hosted video to be displayed in LayerSlider?
Can you please try checking in Layer slider documentation or try contactin Layer slider support. They might be able to help you better in this case.