Converted powerpoint to PDF, .MP4 video won't play in acrobat reader

Hi there,

I have created a powerpoint with a video on a slide. The video is 262 KB. When I 'save as...' to convert to a PDF, and open it in Adobe acrobat reader, the video does not play. The slide looks like it has a screenshot image on it. Please can anyone help me troubleshoot??

Thanks!