I have a video place holder with two videos that I want to play and loop. The first vid is :35. The second is 3:57. The first vid plays fine. The second one starts and plays for about 13 seconds, then the first starts again. After that, the second vid is ignored and the first loops continually. I thought the long WebM vid may be corrupted. I re-converted and re-uploaded the vid. Same result. I changed the order of the videos, so that the longer one plays first. When I did, it played through, as did the short one. Then, on the loop, the long vid stopped after 13 seconds.