4K MKV issues

@“MovieFan.Plex” said:
Can you post the XML for this file? It may not be the container causing the problem.

So where do I get the XML files from? I must admit this is the first time someone has asked me to try and troubleshoot.

You can find info on that at https://support.plex.tv/articles/201998867-investigate-media-information-and-formats/

From a browser, view desired movie in your library.
Click on 3 dots.
Click on Get Info. This brings up the Media Info window.
Click on View XML.
Save file.
Attach to reply (the document icon).

Attached is the first of my XML files in my “4K” library.

Your XML shows the codec as “mpeg4” which means xvid/divx/or some other mpeg4 codec. Plex can only direct play h264(avc) or h265(hevc).

So why can XPlay play these files in 4K from the same Plex server, but the official Plex player cannot?

Xplay is doing something called software decoding. Plex uses hardware decoding, so if your hardware doesn’t support it, your server will transcode the file.

Not correct.

Regardless of if I use XPlay or Plex, transcoding will still take place. The difference is, Plex downscales to 1080p when using the Plex app, but keeps the resolution at 4K when using XPlay.

I take it there is no plan to fix this issue?

@mattcartlidge said:
Not correct.

Regardless of if I use XPlay or Plex, transcoding will still take place. The difference is, Plex downscales to 1080p when using the Plex app, but keeps the resolution at 4K when using XPlay.

That is not possible. I do not use XPlay so I do not know what is going on there, but our transcoder cannot produce 4K output. Anytime there is 4K input (regardless of the codec) and transcoding is involved, it will become 1080p H264. This is a current limitation. We are working on supporting outputting 4K, but I have no update on when that might happen.