cant access dolby digital sound in kodi 17

Hi Everyone, At the moment i am running the Kodi 17 Krypton in beta 1 build. While i am playing all my movies, im not picking up dolby digital sound via my yamaha rxv-475 receiver. In the past with kodi versions 15 and 16 i could always receive dolby digital. even now if i just play the movies at there source which is on my external hard drive i can receive d/d so i know my receiver and wiring is done correctly. Im wandering if anyone could help me with this problem and i thank you in advance. Thanks again