Why does Plex struggle with high bitrate 4k?

Server Version#: latest
Player Version#: latest on SHIELD
<If providing server logs please do NOT turn on verbose logging, only debug logging should be enabled>

Why does Plex struggle with very high bitrate 4K, but VLC plays them just fine? I set everything to direct play, but anything over 8mb/s has problems. When I try to adjust this, where it says ‘play original’ quality, the highest is 8mb/s.. Does that mean Plex is not capable of anything over 8mb/s ??

I am trying to watch a movie that is like 30mb/s and I can watch it flawlessly on VLC, but on Plex it just skips and skips..

I am using Nvidia SHIELD new version. All updates to server and client are current.

It shouldn’t… and to be fair, I wouldn’t call 8 Mbps „high bitrate“.

What’s showing on your server’s dashboard while streaming this video on the Shield?
Specifically, is the stream listed as local / remote / indirect and is it transcoded?
Exemplary screenshot from the "now playing" section
https://support.plex.tv/articles/200871837-status-and-dashboard/

When I ran the nerd mode, it looks like Plex is transcoding the audio. It says that eAC3 audio is not supported by the device, which is weird. I thought that was the most common format there is? I tried another file and it says TrueHD audio is not supported either. It looks like all the audio is getting transcoded, for no apparent reason.

I tried my other Nvidia Shield and everything plays fine on my other 4K TV in my office.. I don’t usually watch movies there. So there must be some setting on the other SHIELD that is messing with the audio on my movies. But like I said, I can watch movies on VLC player and they play perfectly on this shield. Only plex is having the issue. It must be some setting on the Plex client?

I solved it myself.. Enable passthrough on the device eliminates the audio transcoding which causes skipping..

AC3 is very common.
E-AC3 is some kind of successor. Since some of the patents connected to E-AC3 were valid until January this year, direct E-AC3 support is still absent from many devices.