Thank you for the screenshots and background information.
Xibo for Android requires Android 4.4.2, meaning the Firmware on your device is out of date. Xibo for Android also uses MediaServer, which is the built in media Player for Android. As your version does not meet the minimum requirements, it is likely the issue is due to the video codecs not being supported.
I would strongly recommend upgrading the Firmware on your Android device to resolve the issue. You will need to contact the manufacturer of the Android device you are using and ask for a copy of the Firmware, if it is not available from the manufacturers website.
In case you are not able to upgrade the firmware of the device, I have included below a link to our recommended Android hardware.
I am currently using Xibo for Android 1.8 R108 on an Android 6.0.1. I would be more than happy to test your Layout on my device if you would like? If you would like me to test it, please Export the Layout and send it to me in a private message.
Many Thanks.