videos not playing in Xcode simulator

Our mp4 videos play properly on the Tiggzi test site (using Safari on a Mac), although when I create the Xcode version of project and test the videos within the Xcode simulator they won't play.

What's even stranger is that a version from a few weeks ago does work in the Xcode simulator, but a recent Xcode Tiggzi creation doesn't play in Xcode.
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