I have a couple of slides in which the MP4 plays automatically at the beginning of the timeline. On a few of these slides the video stutters right at the beginning ("E-Excellent!"). This does not happen in Preview, only Publish. I have tried adding a 1 second delay at the beginning of the timeline, but that didn't fix it.
My next attempt will be to add a .5-1.0 second delay to the video file. Any other suggestions? And why would this be happening?