I should also note, there ARE plenty of options which can take still mpeg photos and put them into a video format like MP4..
A couple of ways that come to mind is MS Power Point, you create a slide show in power point and newer versions (2007 and up I believe) offer the option to save to a video file..
If MP4 is not one of the choices, you can choose what is offered then after file is created you can convert that file to MP4 with a free video file converter.
Do be aware, MP4 is a "file container", there are multiple ways a MP4 can be encoded and still be called MP4..
Alternately, there are many video editing programs which will allow you to assemble a video out of stills.. I believe Sony Vegas should work.. If you watch you can buy slightly older versions (New Old Stock) on Amazon for a lower more reasonable cost than the newest version..