Can't play MP4 on my tablet

I have a Trio AXS 4G tablet running android 4.2.2. I created an MP4 video on my PC and it runs perfectly. I copied it to the tablet's SD card. I have tries 6 different video players and all I get is "can't play this video" or just a black screen. I copied it back to my PC and it again plays perfectly using VLC. I have played copied DVDs on the tablet and it works fine except that I have to watch 1 VOB file at a time. No app that I load on the tablet seems to be able to play MP4s. Any ideas regarding what I'm doing wrong?

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