I assume the branded Roku is actually a variation of the 4640x, a 5th gen Roku Ultra. This model was the only one that has “advanced” Dolby Digital support. It can convert multi-channel AAC to AC3 internally, so while it’s direct playing, you are still receiving a converted AC3 stream. This internal process however does not produce good results (missing channels, muted volume, etc). Therefore we now use the PMS for converting multi-channel AAC to AC3. This has always been the case for every other Roku.
It sounds though like you are also noticing some videos converting during this transcode session, instead of being copied. It should Direct Stream and copy the video (if compatible), and only convert the AAC 5.1 audio to AC3.
Please verify you have the local/remote quality set to Original, in the Plex settings on the Roku. If this does not fix the issue, please follow these steps so we can troubleshoot further.
- Open the Plex channel
- Enable Remote Logging in the settings
- Play the media that converts the video stream
- Let is buffer and start, then stop it.
- Disable Remote Logging
- Report back with the time/timezone and username once complete.
