General Problem Playing MP4 Videos

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http://androidforums.com – hi guys, i need ur help. if someone has already experienced that videos (MP4-720p- video clips ) doesn't opening in gallery (says : cant open video file) than when i still try to open it sometimes opens... later all videos disappears from galley... does someone had that problem? i have file expert so i can play videos from here... but i don't know whats the problem... maybe Hd 720 P is hard to play.... ?! (General)