Seeking Help Dolby digital Not Showing

[NSK209]

Hi bro I buy new tata play hd box everything was okay but In Sound Settings I can only change Between Auto and pcm. I can't see any options for Dolby Digital or Dolby Digital plus. I don't know whether the box is supporting dolby Digital. If u faced same problem like me please give me a solution to that.
Thank you

 

[mss]

@NSK209 tune into discovery hd and select english audio then check in the info bar.