All Videos w Multichannel audio won't play on ShieldTV2017

[Darkholme]

Server Version#:4.45.0
Player Version#:8.7.2.20952
On the old version of the app it would tell me “not enough CPU to transcode”, after updating it just says ‘unable to play media’.

First I noticed it with a 360p MSMPEG4V3 AC3 3.1 AVI
Then I a 816p H264 DCA 5.1 MKV
Then I noticed it with a 1080p H264 AC3 5.1 MKV.
Then a 720p H264 AC3 5.1

Here’s one with interesting findings:
2160p HEVC AAC 2 video is now also no longer playing (it used to a month or two ago), but the 720p H264 AAC2 optimized version I made for the fire tv since it couldnt handle HEVC will play.

So it can’t handle HEVC anymore either.

They’ve all played on my Shield TV just fine in the past.

They play fine on web and mobile. I believe one of them played fine on our Fire TV Stick upstairs the other day, but my wife is sleeping so I can’t pull up these same videos to test there.

Turning on Passthrough, and trying “original audio quality” have not solved the issue.

I only noticed the problem the past few days, and then I updated Plex on the Shield hoping that would fix it, and made sure my Plex Server was up to date, and hoped that would fix it, and it hasn’t.

Old videos with low quality MP3 Stereo sound play fine.

Please Help. This has effectively crippled my TV.

[Edit] I am now getting “This server is not powerful enough to convert video.” on Plex Web, too. I’ve been using this Plex server since 2016. It never had problems transcoding before. I have no idea what’s happening.

Currently still playing correctly on FireTV Stick.

Can I go back to an old version of the player that worked? How do I do that on my ShieldTV? It’s easy enough on my phone or on the server, but I can’t figure out how to do it on the ShieldTV.

[Darkholme]

Update.

So far I still have no luck with the Android TV Client, and I’m having different weird issues with the web client. Other videos are skipping, for instance.

After some experimentation I HAVE been having luck with Android Kodi’s Plex plugin (some old version I didn’t actually check to see which one) and DLNA over VLC though. Which makes me think it’s not the server, it’s something wrong with the clients.

And I guess I can continue to use Kodi or VLC until whatever is going on gets sorted out. At least they will play.

I’ll set myself a reminder and check back in a while to see if this has been replied to, and in a month or so I’ll try updating the clients and see if anything works yet.