Video not showing in preview

I am running Windows server; have followed instructions to export a powerpoint presentation to video. I uploaded both the mp4 and a wmv version to the library to test both formats When I assign the video (short video 43mb) to a region, I only see a blank screen in the preview the layout. All other media work just fine. I cannot get video to work at all. Thank you in advance for any help.


Can you open that video file in Windows Media Player? The Preview layout is using WMP to open videos (so does Windows Player) - maybe you are missing some codecs.