Having the same issue with latest Plex player on Shield TV Pro 2019.
This is just a guess, but there are probably several different branches in development at the same time. What likely happened here is that some of the bug fixes that made it into the previous beta branch builds, and then eventually into the stable ones, did not get merged with the experimental branch builds, which is now the new beta. So, weāre seeing the āPlay Nextā, preferred subtitle, and some other GUI bugs again.
I could, of course, be completely wrong here 
Unfortunately it doesnāt always seem reproducible.
After restarting the Shield that same movie may or may not behave normally.
But it has happened again today even with a 1080p web show so probably not anything to do with branching.
On one occasion yesterday this issue caused Plex to crash so if it happens again I will try and grab some logs.
Had issues with high bitrate 4k hdr + atmos and subtitles with the stable version and had to upgrade to beta and now its fine. But its sad that such a big issue made it to the stable Release.
Im on the shield 2019 pro btw and the source was 4k hdr with dolby vision and truehd atmos and video bitrate was about 60-70mbits + audio
I donāt know if I can provide a small sample, Iāll see if cutting a segment allows the issue to persist, but I am able to reproduce the issue using a remux rip of The Martian Extended Cut UHD which is a release known to contain branching cuts
The dropout happens at the scene transition around 58:03 on the extended cut while direct playing using the TrueHD Atmos audio track with 100% reproducibility on the NVidia shield pro
Iāve tried to re-rip using a number of different solutions (makeMKV, CloneBD, DGDemux, eac3to) as well as processing the Atmos track using MLP (GitHub - domyd/mlp: A Dolby TrueHD demuxer and utility tool, with a focus on accurate and correct TrueHD demuxing.) and then remuxing using mkvtoolnix without any improvements of this drop out
This thread here discusses the issue with Kodiās solution that seems to fix the problem for some users on the last 2 pages
Ripping Dolby Atmos into MKV - Page 15 - www.makemkv.com
Update:
Here is a 30 second clip from that rip that contains the scene transition at a branch cut where the TrueHD audio desyncs, confirmed the issue still persists with this clip on the latest beta APK linked in this thread
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Hi, having the TrueHD issues described in this thread. How do I get on the beta channel so I can install the latest version? Thanks!
Latest beta still has issues. Random stuttering of video and audio cutting out periodically. Yet again had to roll back to 8.30.2.
This is being done extremely sloppy. Very disappointed.
This was the fix for me. Thank you!
Regarding the 1080p issue I mentioned: false alarm. I thought it had something to do with the fix here, but my AVR was having an issue. Please disregard.
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This fixed it also for me! Thanks for the update and the detailed explanation! Saved me from performing a Shield downgrade to 8.2.3ā¦
This worked for me. Thank you!
Guys please sit on this build for a while before you claim that it is fixed. This definitely fixes the infinite spinner issue, but there is still stuttering and audio cutting out for TrueHD 7.1 audio.
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Could you tell us the media details? Iāve watched several files with Atmos all the way through now, and I havenāt come across an issue yet.
Iām on beta 9.1.0.31720.
Have you tried much video scrubbing? It seems especially (but not exclusively) to happen in rewind, where the picture and audio freeze but the playback timer carries on as if itās playing correctly (but sadly not always reproducible.)
That said Iām still on the side loaded alpha test rather than the beta. (sixones mentioned theyāre the same.)
I will bite the bullet tomorrow and try the beta and failing that I will roll back to 8.3.0 (or Emby/Jellyfin)
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Ah, thatās probably why I havenāt seen it. I never scrub 
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Yes this is true, the latest beta still has these issues. You can also try Hellboy or Stripes. Also films with seamless branching. At multiple points during these films audio drops out and desyncs. Iāve bought the Shield at the end of january and itās been nothing but troubleshooting since, both with Plex and Kodi. Fed up with it, Iāve reverted to my Windows setup with Kodi and MPC-HC as an external player and itās flawless.
What a huge disappointment this Shield + Plex/ Kodi has beenā¦ 
How do you identify films with branching? I have a number of videos that exhibit this freezing problem but wouldnāt have associated them with branching.
Itās often the case when there are multiple versions of a movie on the same disc. Like a theatrical and directorās cut. These playlists consist of a lot of m2ts video files. When using a tool like MakeMKV to make a mkv of the directorās cut for instance, it āstitchesā these m2ts files together. If thereās also a Dolby TrueHD track, the resulting mkv file can not be played correctly by Plex. Kodi had issues playing these as well, although much less severe than Plex. Of the software that Iāve tried, only MPC-HC+LAV filters+MadVR plays these files flawlessly.
I believe it were actually the LAV filters which have had updates/fixes in the past in order to play these files without fault. But Iām not 100% sure about that.
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Youāre correct:
0.75.0 - 2021/03/30
LAV Audio
- Fixed: Resolved an issue with glitching TrueHD bitstreaming on seamless-branching titles
Plex should hire Nev, but he already works for a competitor (sort of) 
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Thanks for that @VBB . Thatās exactly what I was referring to.
Yes, if theyād all work together (including Madshi, whose MadVR is brilliant), Iām sure weād have the perfect mediaplayer. But they all have their own thing.
LAV is open source though. Seems to me that a skilled programmer could still learn from it.
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