Where is "Enable Dolby Digital on Apple TV" in currently PMS version ?

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Hi,

I use Plex since 2 years ago, I could see this option in “Transcoder” advanced panel (for AC3 with my Apple TV because I want use DirectPlay). But in the 0.9.16.6 version of PMS, this option are missing.
How to do ?

EDIT: I think, now it’s automatically detect by PMS, but I don’t know…