Play all videos on s4 mini

[Mikezbitz]

Alright guys
having trouble playing loads of downloaded videos very few im downloading play any more
ive installed mx player it didnt help
ive reset the phone it didnt help
anyone know a solution
thanks in advance

 

[Titillating]

Can you describe the kinds of trouble you're having? Maybe a specific error message? What kind of video files are these? Do they work on any other devices?