Why aren't there audio when playing videos on the Motorola Moto X Play?

I'm using Moto X play.when I'm seeing videos I'm not able to hear voice.

Please help me

While playing a video press volume up key. If volume is max and still won't hear anything, then the video player app you are using is not fully supporting the video format. I suggest that you use 3rd party video player apps like MX Player (link) and VLC for Android (link). Used both apps and never had problem playing videos.    

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