no ac3 audio tvheadend

Hi
maybe someone had same issue in the past i have a moi+ with tbs6285 card but my issue is that tvheadend seems dont play ac3 audio my question is why? or how solve this?
thank you
best regards
maybe someone had same issue in the past i have a moi+ with tbs6285 card but my issue is that tvheadend seems dont play ac3 audio my question is why? or how solve this?
thank you
best regards