There is/was a bug in Android 4.4.x that some devices has problems with Videos and Chrome. Don't know if this is even an older bug.
Can you try https://goo.gl/pVJd10
on you Android Device with Chrome and FireFox? It should play fine in FireFox and don't play in Chrome, only Audio. You have to tap once to start the video, the button is only for fullscreen, that was a test if it works in fullscreen,