ATV3 5.1 channel ?

friends
have atv third generation, have connected atv yamaha receiver optical cable, whenever try play 5.1 channel content through air video receiver shows me pro logic, have checked settings in atv dolby digital on, tried play hd contents directly through atv there no dolby digital in receiver, atv not sending audio signal in 5.1 channel (dd), please tell me how make worked

 

airplay doesn't support 5.1 on apps, need check on on app developers website or apple forums, , on build in apple video app, video have ac3 5.1 audio on mp4/m4v container.

 

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