Hello Tarek,
Thanks for writing in! Most mobile browsers detects media files like videos and audios and it will automatically disable it. Video and Audios are bandwidth extensive and that is not good for mobile users.
In Safari on iOS (for all devices, including iPad), where the user may be on a
cellular network and be charged per data unit, preload and autoplay are disabled.
No data is loaded until the user initiates it.
This is one of the reason why browsers in android and iOs devices cannot view videos and audios via a website.
For more details: http://feedback.dominknow.com/knowledgebase/articles/30293-why-won-t-my-mobile-device-audio-or-video-play-aut
Hope this helps.