The Slideshow mp4 file created in Lightroom does not play on an iPad

If I take a collection of images and create a sideshow in Lightroom 4 and export it as a mp4 file using the 720p preset and put it at a website, the file works fine with various Windows computers and android devices but does not play in an iPad. If I take that same mp4 file and run it through Adobe Premier Elements 12 to produce a new 720p mp4 file, that mp4 file plays fine in the iPad.
Anyone know the reason for this and how to create a 720p file that will play in the iPad in LIghtroom?
Message was edited by: William LaMartin

Don't know if this will help, but you might want to check your mp4 files against this :-
iPad Supported Video Formats & Movie Formats
    •    H.264 video up to 1080p, 30 frames per second, High Profile level 4.1 with AAC-LC audio up to 160 Kbps, 48kHz, stereo audio in .m4v, .mp4, and .mov file formats;
    •    MPEG-4 video up to 2.5 Mbps, 640 by 480 pixels, 30 frames per second, Simple Profile with AAC-LC audio up to 160 Kbps per channel, 48kHz, stereo audio in .m4v, .mp4, and .mov file formats;
    •    Motion JPEG (M-JPEG) up to 35 Mbps, 1280 by 720 pixels, 30 frames per second, audio in ulaw, PCM stereo audio in .avi file format

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The Slideshow mp4 file created in Lightroom does not play on an iPad

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