Video Artifacts when transcoding DTS to AAC (LG WebOS)

Plex Media Server
1

Server Version#: 4.47.3
Player#: LG CX9 (latest App)

I am having a weird issue:

Sometimes when PMS transcodes DTS to AAC the first 10 minutes are usually fine. But then the video stream gets huge artifacts (although it is Direct Stream).

PXL_20210101_132127123.MP
PXL_20210101_132127123.MP816Ɨ612 88 KB

Interestingly this behavior does not apply to all movies with a DTS track. Just specific ones.
Anyone seen such a behavior already? Am I doing sth wrong?

Thankful for any suggestions

2

I have done a little more research. This issue seems to be LG WebOS specific when transcoding DTS-HD-MA or EAC-3 to AAC in combination with a 4k video stream (direct stream). The same file with the same DTS audio tracks play fine in 1080p on my LG.
On my shield everything plays fine (also transcoding DTS to AAC).

3

Can anyone maybe reproduce this issue?

EDIT: Just found this topic. Seems to be related (and I know that LG 2020 models dont support dts anymore. So I disabled it in the LG Plex app)

Also when I convert one of the tracks to AC3 and mux it back everything works fine. But dont want to do that for my whole collectionā€¦

4

How have you converted DTS audio to AC3 on your file? Iā€™ve tried several apps, but no one worked well.
P.S wanna to throw away this $2000 peace of crap called lg cx

5

Check out XMedia Recode.

You can tell it to copy the video track while converting the audio track.

Works for HDR10. Havenā€™t tried it with DV.

1 Like
6

Iā€™d hate for you to have to do that. If you send it to me, Iā€™ll dispose of it for you.

7

Itā€™s very dissapointing to but high end tv and have problems with watching movies, my previous samsung didnā€™t have any issues with watching 4k hdr movies via plex.

9

When on the video tab:

  • If there is already something in the output section, select it and delete it.
  • Now select (click once to highlight) the video in Source.
  • You should now be able to choose ā€œCopyā€ for the Mode setting.
  • Then click the right arrow button between Source and Output.
  • Your file should now appear in the Output section. The last column in Output is Mode. It should show Copy.

Iā€™m sure thereā€™s a less laborious way to do all of that. Thereā€™s probably a way to have it not pre-populate the Output section. Maybe a Profile or Format setting on the Format tab?

I donā€™t use the tool that often, and havenā€™t found a way to do that with less steps.

10

Thankā€™s again. I have a file in mkv format/extension, iā€™ve chosen format ā€œMatroskaā€ and extension mkv and now it converted well for about 15 minā€™s, but for now tv doesnā€™t select hdr mode, but plex says itā€™s hdr video.

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PN me If you need further help. I can give you a detailed explanation of how to convert and muxing. Took me a few hours to figure it out. Basically what I do is convert the DTS track to AC3 with Xmedia Recode and then merge it with the original file with MKVToolNix. Although I am pretty sure there is an easier way. But this works for me.

If anyone has a simpler solution, I am open for feedback. But ofc it would be better if the WebOS Plex App would simply be fixed =/

1 Like
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Thankā€™s Iā€™ve done it and now it works, but for some reasons PLEX says that my audio track is in stereo format, dispite i convrted it to 5.1 via XMedia Recode. Besides looking for solution buy replaying movie just from my pc, connected to tv via hdmi.

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Did you make sure that you chose 5.1 in Xmedia Recode? Because by default it is set to convert it to Stereo (dont ask me why). Also you need to select the correct Profile for the channels according to the source file. (there should be like 6 profiles. Sth among "Center, Front left, Front right, LFE, etc). Not at home right now but I can share some Screenshots later if needed.

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