Well assi would love a solution … really annoying!
Mit freundlichen Grüßen / Best regards
Richi
You would need to give more information about the videos that buffer. Plex doesn’t do HDR properly, or without transcoding unless something has changed in the latest versions.
If you are using 5GHz wireless you can try changing the channel selection to manual instead of automatic. Then select the first 6 channels, middle 6, or last 6 channels for best performance. This will depend on what channels are in use by any close competing wireless devices.
Plex has been able to direct play HDR 4K movies on LG OLEDs since early 2018. It just doesn’t like image format subtitles, e.g. PGS subtitles. It’ll even now direct stream a 4K HEVC video and just transcode the audio if it’s in an incompatible format like TrueHD.
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Yes, sorry. The issue is that Plex can’t transcode HDR properly using x264 only, not that it won’t direct play.
If a .mkv file has both a TrueHD audio track and a AC-3 track, why doesn’t Plex fall back to using the AC-3 track to avoid transcoding?
I think it was raised some time back but apparently it’s not as simple as it sounds. However, I have noticed that recently if I forget to switch from the TrueHD track to an AC-3 track Plex will only transcode the audio. It’ll send the video untouched along with the transcoded audio which is fine as audio transcodes are so much easier on the server.
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Yeah, I noticed it doing this for the first time last night. Previously if the audio had to be transcoded it would down-convert the 4k HDR video to 1080p with the associated washed-out colourspace conversion. Last night, however, I was watching a movie with a TrueHD soundtrack which I forgot to switch from (my gear doesn’t support it) an Plex transcoded the audio to AAC and remuxed the untouched video back into a matroska container. Nice!
To be fair, I’m glad it didn’t fall back to the AC3 track in this specific case. Although this is usually the same as the TrueHD track, in this case it was a commentary track and there’s no AC3 version of the regular audio track.
Agreed, though, it would be nice if we could set a default audio format preference in the same way that we can set a default language.
You could also use ffmpeg to copy the TRUE-HD track to AC3 or EAC3 etc, and preselect that, while leaving the video untouched.
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On that note, I just use mkvinfo (to select the right audio and subtitle tracks) and mkvmerge to strip out the stuff my TV and soundbar can’t handle altogether. I’m left with AC3, DTS or DTS-HD MA audio and SRT subs, smaller files and more disk space.
Then what happens when you buy a 2019 or newer model LG that supports EARC so you can pass through your TRUE-HD/ATMOS audio? You will be missing that deleted track, which doesn’t save all that much space compared to video.
I knew someone would come back with that reply 
My house is such that I’ll never be able to put in a big surround system without seriously remodelling the lounge so I’m quite happy with the 5.1 system I presently have and audio formats that it supports.
Ok, that is quite understandable… although ATMOS will just use the speakers available. Plus, TRUE-HD 7.1 would just need 2 more speakers. Maybe wireless speakers for height would alleviate any wiring concerns. Of course with limited space, there may not be any real benefits to additional speakers anyway. Even the sample files available for ATMOS I think are assuming you have a separate home theater room for especially all the overhead speakers.
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