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Correct video format for apps

I'm learning vuforia, but i always get stuck in the same spot, I can make the video work with the included examples on a few devices, but when i try to include my corporate video in mp4 format, the videoplayer shows the error texture in some devices and plays perfectly on others i tried some compression settings in handbrake, but the experiments ni handbrake have always failed.

 

Does anyone know how to convert my mp4 to the same m4v format used in these examples?

 

Thank you very much for your answers :)