AAC 5.1 being down converted to PCM stereo by Roku Ultra



I have a Plex server on my Synology NAS and when I try to play back movies the AAC 5.1 audio (from Handbrake) is being down converted to stereo. Netflix plays Dolby Digital just fine so I know the audio set up is fine.

I thought the Ultra was supposed to transcode AAC 5.1 to AC3 5.1. I believe all my settings are correct on the Roku (which is attached to Yamaha AVR by HDMI).

Also, if I encode the movies as AC3 they AVR plays the Dolby Digital 5.1 just fine. Do I need to redo all my movies or is there hope?


What are your settings in the roku for audio connection. I had notice if you have it set to auto sometimes it down grades to PCM… I hard coded it to D+ and DTS and no everything seems to show correctly on the AVR I have…


Duplicate post - see my answer explaining here - https://forums.plex.tv/discussion/comment/1614118/#Comment_1614118
(No Roku does AAC 5.1 by default, and few models only transcode to PCM 2.0)


Thanks again :slight_smile: