Playback issues LG StanByMe (27ART10)

Plex Players Smart TVs
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1

Server Version#: 1.42.2.10102
Player Version#: 5.93.2 (WebOS)

I can play 1080p content fine, but whenever I try and play 4K content, I always get the following error: “Playback Error: An unexpected playback problem occurred.”

I have tried disabling direct play, selecting low resolution to force transcode, disabling hardware transcoding in the server, subtitles are turned off.

I can transcode the same content to 1080p on other devices (iOS, browsers, etc.) just fine.

2

DEBUG logs here: https://pastebin.com/q0VReR0P

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@peedub

Pastebin is private and not accessible .

Please upload the ZIP file PMS gives you here.

4

Apologies - I thought I was doing the sensible thing!

Here’s a fresh log. First thing in the morning, I tried playing 2 different 4K shows.

Plex Media Server Logs_2025-09-01_06-43-52.zip (3.6 MB)

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Hi @ChuckPa - any indication what the issue might be?

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The only ERROR I can see in the logs is about parsing an HTTP request. For example:

Error parsing HTTP request: 26value%3D1080)%2Badd-limitation(scope%3DvideoCodec%26scopeName%3Dhevc%26type%3DnotMatch%26name%3Dvideo.DOVIProfile%26value%3D5)%2Badd-limitation(scope%3DvideoTranscodeTarget%26scopeName%3Dmpeg2video%26scopeType%3DvideoCodec%26context%3Dall%26protocol%3Dhls%26type%3DupperBound%26name%3Dvideo.bitDepth%26value%3D8)%2Badd-limitation(scope%3DvideoTranscodeTarget%26scopeName%3Dmpeg2video%26scopeType%3DvideoCodec%26context%3Dall%26protocol%3Dhls%26type%3DupperBound%26name%3Dvideo.width%26value%3D1920)%2Badd-limitation(scope%3DvideoTranscodeTarget%26scopeName%3Dmpeg2video%26scopeType%3DvideoCodec%26context%3Dall%26protocol%3Dhls%26type%3DupperBound%26name%3Dvideo.height%26value%3D1080)%2Badd-limitation(scope%3DvideoTranscodeTarget%26scopeName%3Dmpeg4%26scopeType%3DvideoCodec%26context%3Dall%26protocol%3Dhls%26type%3DupperBound%26name%3Dvideo.bitDepth%26value%3D8)%2Badd-limitation(scope%3DvideoTranscodeTarget%26scopeName%3Dmpeg4%26scopeType%3DvideoCodec%26context%3Dall%26protocol%3Dhls%26type%3DupperBound%26name%3Dvideo.width%26value%3D1920)%2Badd-limitation(scope%3DvideoTranscodeTarget%26scopeName%3Dmpeg4%26scopeType%3DvideoCodec%26context%3Dall%26protocol%3Dhls%26type%3DupperBound%26name%3Dvideo.height%26value%3D1080)%2Badd-transcode-target-settings(type%3DvideoProfile%26context%3Dall%26protocol%3Dhls%26ForceZeroByteEmptySegment%3Dtrue)&X-Plex-Client-Profile-Name=Generic

7

A similar error message from the TV when I send logs to PMS as well

[Player] A critical HTML media error occurred: 4 (MEDIA_ELEMENT_ERROR: Format error); the player cannot recover

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and a fresh set of logs with a few errors showing up

Plex Media Server Logs_2025-09-08_21-25-47.zip (3.8 MB)

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If anyone else comes across this issue, AI helped me diagnose the issue. To fix the issue, I manually specified the IP address of Plex in the TV app and added a whitelist entry for *.plex.direct into my DNS setup.

The issues:

  • Your LG app begins playback and immediately throws HTML5 code 4: “MEDIA_ELEMENT_ERROR: Format error” at the moment it opens playback.
  • Requests for the HLS manifest are malformed before Plex even reads them—note the first line arriving as “ET /video…index.m3u8” or other garbled strings, which Plex rejects with HTTP 400 “Error parsing HTTP request”. That points to something on the path (proxy / filter / IPS) mangling the request.
  • You still have *.plex.direct DNS intercepts: the server reports the name resolves to 0.0.0.0 instead of your LAN IP, which will intermittently break local playback.
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@peedub

Supplemental info for you and others.

IP address 0.0.0.0 is also a symptom of DNS Rebinding Protection blocking
(plex.direct is rebound on top of your LAN)

Most routers have a method to specify exceptions.

In PfSense, you allow plex.direct in DNS Resolver settings

Screenshot from 2025-10-27 02-42-48
Screenshot from 2025-10-27 02-42-48747×400 32.7 KB

server:
private-domain: "plex.direct"

Sorry I missed diagnosed this.

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