- Can Plex transcode Bluray Remux with Dolby TrueHD Atmos to DD+ Atmos?.
- Just Stream (netflix,HBO...)
- Use 5.1 and surround upmixer to get atmos
- Obvious, waste a whole lot on shield pro
To answer your questions in a simple answer.
NO, you won’t get Atmos. As far as I know transcode is a bit of an old tech in todays day and age and it’s still mainly done ONLY for converting any Audio Codec your Soundbar or A/V Receiver might not support into the mainstream supported lossy audio codec of (AC3 - Dolby Digital) or in rare cases either uncompressed Multi-Channel or Stereo PCM. I still haven’t seen a transcoder on Kodi or Plex that does Dolby Digital Plus, there’s no such thing as a transcoder that retain any Atmos or height channels surround for that matter.
Look at Transcoding similar as to “Downmixing” a higher Audio Quality source to a lesser Audio Experience BUT in cases of transcoding to AC3 - Dolby Digital retaining some kind of standard Dolby surround sound.
Edit: if you want Atmos in TrueHD, you either get a Shield TV or simply skip those sources all together and play something that your Soundbar or A/V receiver can decode natively. Transcoding, Downmixing, etc will always compress the original sound quality and surround you would be hearing as if you had the right equipment that supports decoding of the audio codecs you’re trying to play.
Getting a Shield means you won't have to transcode TrueHD Atmos since it can pass it though to the AVR. any other device will have to transcode to something less than Atmos.
Shield TV is a PIA but for me, nothing does it better. All else in the chain must support what you are using through it. That's Internet speed/bandwidth, router, WiFi and/or LAN, cables, receiver, display, and speaker numbers and layout. You cannot get blood out of a turnip.
The best outcome for me is offerings in Vision and Atmos.
Also, I think Plex is worthless.