Hello
I am using the following short code in my article:  {mp4}test|D|700|400|1{/mp4} 
I have tried with and without the |D
The video shows on my page, but does not auto-start.
The video is hosted on our web server. It is 71.38 MB in size. 
When I click into the video it does play successfully.
The customer really wants the video to auto-start.  Any ideas?

BTW I use AllVideos elsewhere on the same site and those videos auto-play successfully. Could it be the size of the video?

Thanks,
Pat