No Dolby Digital Audio Passthrough

[theguymadmax]

Fire TV stick setting "Dolby Digital +":
- converts PCM to DD+
- does not convert DD/DD+
- does not convert DTS

When you say that it converts PCM to DD+:

Is jellyfin actually transcoding your audio? Play a stereo file and post the ffmepg logs, if that's the case

or

Is your AVR virtually mixing it? For example on my AVR, I have movie, music, game, and pure as options. The AVR will mix PCM stereo to virtual surround sound depending on what setting I have, so it looks like it's DD+. I have to select the pure mode setting to play as stereo. In this case, jellyfin does nothing to the audio, the AVR does the mixing, so there will not be any ffmpeg logs.