LG WebOS app playing incorrect audio track

Plex Players Streaming Devices
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1

Server Version#: 4.63.0
Player Version#: 5.28.1

For some reason the Plex app on my LG C1 OLED is using the wrong audio track when playing a movie. If I try to change the audio track it continues to use the wrong one. I do not have this issue when using the app on other devices.

Examples so far are Independence Day playing the Spanish audio track. Harry Potter and the Half Blood Prince playing what I assume is the visually impaired track.

Has anyone else had this issue lately? I know it was a problem for the Plex app on LG WebOs tvs a few years ago.

2

I’m having the same issue when playing on my CCwGTV. Movie has 6 audio tracks and is an MKV container with Dolby Vision. It seems like TrueHD plays fine, but since my system doesn’t support lossless audio with Direct Play I’m trying to play my AC-3 5.1 EX track, but it seems impossible.

The other audio tracks seem to be offset by 1 when I try to select them, and selecting the last track makes the file not play at all. The server dashboard shows the audio track that I selected, even though it’s not the one playing.

When selecting the following, these tracks play:

  • TrueHD Atmos 7.1 → TrueHD Atmos 7.1
  • AC-3 5.1-EX → AC3 Stereo (Commentary Track #1)
  • AC3 Stereo (Commentary Track #1) → AC3 Stereo (Commentary Track #2)
  • AC3 Stereo (Commentary Track #2) → AC3 Stereo (Commentary Track #3)
  • AC3 Stereo (Commentary Track #3) → AC3 Stereo (Commentary Track #4)
  • AC3 Stereo (Commentary Track #4) → will not play
3

@tominkozhimala

Can you please show the mediainfo output for this file?

mediainfo will detail the track info so I can then look at it and ask the engineers if needed.

Also, does “Commentary Track 4” (track 6) play in other players ?

4

here is the mediainfo

Media

* Duration 2:16:18
* Bitrate 55492 kbps
* Width 3840
* Height 2160
* Aspect Ratio 1.78
* Video Resolution 4K
* Container MKV
* Video Frame Rate 24p
* Video Profile main 10

#### Part

* Duration 2:16:18
* File The.Matrix.1999.UHD.BluRay.2160p.`<redacted>`
* Size 52.91 GB
* Container MKV
* Video Profile main 10

* Codec HEVC
* Bitrate 48910 kbps
* D O V I B L Compat I D 6
* D O V I B L Present true
* D O V I E L Present true
* D O V I Level 6
* D O V I Present true
* D O V I Profile 7
* D O V I R P U Present true
* D O V I Version 1.0
* Bit Depth 10
* Chroma Location topleft
* Chroma Subsampling 4:2:0
* Coded Height 2160
* Coded Width 3840
* Color Primaries bt2020
* Color Range tv
* Color Space bt2020nc
* Color Trc smpte2084
* Frame Rate 23.976 fps
* Height 2160
* Level 5.1
* Profile main 10
* Ref Frames 1
* Width 3840
* Display Title 4K (HEVC Main 10 HDR)
* Extended Display Title 4K (HEVC Main 10 HDR)

* Codec TRUEHD
* Channels 8
* Bitrate 4420 kbps
* Language English
* Language Tag en
* Audio Channel Layout 7.1
* Bit Depth 24
* Sampling Rate 48000 Hz
* Title TrueHD Atmos 7.1
* Display Title English (TRUEHD 7.1)
* Extended Display Title TrueHD Atmos 7.1 (English)

* Codec AC3
* Channels 6
* Bitrate 448 kbps
* Language English
* Language Tag en
* Audio Channel Layout 5.1(side)
* Sampling Rate 48000 Hz
* Title AC-3 5.1-EX
* Display Title English (AC3 5.1)
* Extended Display Title AC-3 5.1-EX (English)

* Codec AC3
* Channels 2
* Bitrate 192 kbps
* Language English
* Language Tag en
* Audio Channel Layout stereo
* Sampling Rate 48000 Hz
* Title Commentary by Philosophers Dr. Cornel West & Ken Wilber
* Display Title English (AC3 Stereo)
* Extended Display Title Commentary by Philosophers Dr. Cornel West & Ken Wilber (English AC3 Stereo)

* Codec AC3
* Channels 2
* Bitrate 192 kbps
* Language English
* Language Tag en
* Audio Channel Layout stereo
* Sampling Rate 48000 Hz
* Title Commentary by Critics Todd McCarthy, John Powers & David Thomson
* Display Title English (AC3 Stereo)
* Extended Display Title Commentary by Critics Todd McCarthy, John Powers & David Thomson (English AC3 Stereo)

* Codec AC3
* Channels 2
* Bitrate 192 kbps
* Language English
* Language Tag en
* Audio Channel Layout stereo
* Sampling Rate 48000 Hz
* Title Commentary by Film Editor Zach Staenberg, VFX John Gaeta & Actress Carrie-Anne Moss
* Display Title English (AC3 Stereo)
* Extended Display Title Commentary by Film Editor Zach Staenberg, VFX John Gaeta & Actress Carrie-Anne Moss (English AC3 Stereo)

* Codec AC3
* Channels 2
* Bitrate 192 kbps
* Language English
* Language Tag en
* Audio Channel Layout stereo
* Sampling Rate 48000 Hz
* Title Commentary by Composer Don Davis and Music-Only Track
* Display Title English (AC3 Stereo)
* Extended Display Title Commentary by Composer Don Davis and Music-Only Track (English AC3 Stereo)

* Codec PGS
* Bitrate 21 kbps
* Language English
* Language Tag en
* Title English (SDH)
* Display Title English (PGS)
* Extended Display Title English (SDH) (PGS)

* Codec PGS
* Bitrate 10 kbps
* Language Arabic
* Language Tag ar
* Title Arabic
* Display Title Arabic (PGS)
* Extended Display Title Arabic (Arabic PGS)

* Codec PGS
* Bitrate 20 kbps
* Language Bulgarian
* Language Tag bg
* Title Bulgarian
* Display Title Bulgarian (PGS)
* Extended Display Title Bulgarian (Bulgarian PGS)

* Codec PGS
* Bitrate 17 kbps
* Language Chinese
* Language Tag zh
* Title Chinese (Mandarin Traditional)
* Display Title Chinese (PGS)
* Extended Display Title Chinese (Mandarin Traditional) (Chinese PGS)

* Codec PGS
* Bitrate 19 kbps
* Language Croatian
* Language Tag hr
* Title Croatian
* Display Title Croatian (PGS)
* Extended Display Title Croatian (Croatian PGS)

* Codec PGS
* Bitrate 16 kbps
* Language Czech
* Language Tag cs
* Title Czech
* Display Title Czech (PGS)
* Extended Display Title Czech (Czech PGS)

* Codec PGS
* Bitrate 18 kbps
* Language Danish
* Language Tag da
* Title Danish
* Display Title Danish (PGS)
* Extended Display Title Danish (Danish PGS)

* Codec PGS
* Bitrate 18 kbps
* Language Dutch
* Language Tag nl
* Title Dutch
* Display Title Dutch (PGS)
* Extended Display Title Dutch (Dutch PGS)

* Codec PGS
* Bitrate 20 kbps
* Language Estonian
* Language Tag et
* Title Estonian
* Display Title Estonian (PGS)
* Extended Display Title Estonian (Estonian PGS)

* Codec PGS
* Bitrate 18 kbps
* Language Finnish
* Language Tag fi
* Title Finnish
* Display Title Finnish (PGS)
* Extended Display Title Finnish (Finnish PGS)

* Codec PGS
* Bitrate 18 kbps
* Language French
* Language Tag fr
* Title French
* Display Title French (PGS)
* Extended Display Title French (French PGS)

* Codec PGS
* Bitrate 22 kbps
* Language German
* Language Tag de
* Title German (SDH)
* Display Title German (PGS)
* Extended Display Title German (SDH) (German PGS)

* Codec PGS
* Bitrate 19 kbps
* Language Greek
* Language Tag el
* Title Greek
* Display Title Greek (PGS)
* Extended Display Title Greek (Greek PGS)

* Codec PGS
* Bitrate 16 kbps
* Language Hebrew
* Language Tag he
* Title Hebrew
* Display Title Hebrew (PGS)
* Extended Display Title Hebrew (Hebrew PGS)

* Codec PGS
* Bitrate 18 kbps
* Language Hungarian
* Language Tag hu
* Title Hungarian
* Display Title Hungarian (PGS)
* Extended Display Title Hungarian (Hungarian PGS)

* Codec PGS
* Bitrate 21 kbps
* Language Icelandic
* Language Tag is
* Title Icelandic
* Display Title Icelandic (PGS)
* Extended Display Title Icelandic (Icelandic PGS)

* Codec PGS
* Bitrate 24 kbps
* Language Indonesian
* Language Tag id
* Title Indonesian
* Display Title Indonesian (PGS)
* Extended Display Title Indonesian (Indonesian PGS)

* Codec PGS
* Bitrate 20 kbps
* Language Italian
* Language Tag it
* Title Italian (SDH)
* Display Title Italian (PGS)
* Extended Display Title Italian (SDH) (Italian PGS)

* Codec PGS
* Bitrate 17 kbps
* Language Japanese
* Language Tag ja
* Title Japanese
* Display Title Japanese (PGS)
* Extended Display Title Japanese (Japanese PGS)

* Codec PGS
* Bitrate 14 kbps
* Language Korean
* Language Tag ko
* Title Korean
* Display Title Korean (PGS)
* Extended Display Title Korean (Korean PGS)

* Codec PGS
* Bitrate 19 kbps
* Language Latvian
* Language Tag lv
* Title Latvian
* Display Title Latvian (PGS)
* Extended Display Title Latvian (Latvian PGS)

* Codec PGS
* Bitrate 20 kbps
* Language Norwegian
* Language Tag no
* Title Norwegian
* Display Title Norwegian (PGS)
* Extended Display Title Norwegian (Norwegian PGS)

* Codec PGS
* Bitrate 16 kbps
* Language Polish
* Language Tag pl
* Title Polish
* Display Title Polish (PGS)
* Extended Display Title Polish (Polish PGS)

* Codec PGS
* Bitrate 20 kbps
* Language Portuguese
* Language Tag pt
* Title Portuguese (Brazilian)
* Display Title Portuguese (PGS)
* Extended Display Title Portuguese (Brazilian) (Portuguese PGS)

* Codec PGS
* Bitrate 22 kbps
* Language Portuguese
* Language Tag pt
* Title Portuguese (Iberian)
* Display Title Portuguese (PGS)
* Extended Display Title Portuguese (Iberian) (Portuguese PGS)

* Codec PGS
* Bitrate 18 kbps
* Language Romanian
* Language Tag ro
* Title Romanian
* Display Title Romanian (PGS)
* Extended Display Title Romanian (Romanian PGS)

* Codec PGS
* Bitrate 21 kbps
* Language Russian
* Language Tag ru
* Title Russian
* Display Title Russian (PGS)
* Extended Display Title Russian (Russian PGS)

* Codec PGS
* Bitrate 19 kbps
* Language Serbian
* Language Tag sr
* Title Serbian
* Display Title Serbian (PGS)
* Extended Display Title Serbian (Serbian PGS)

* Codec PGS
* Bitrate 19 kbps
* Language Slovenian
* Language Tag sl
* Title Slovenian
* Display Title Slovenian (PGS)
* Extended Display Title Slovenian (Slovenian PGS)

* Codec PGS
* Bitrate 19 kbps
* Language Spanish
* Language Tag es
* Title Spanish (Castilian)
* Display Title Spanish (PGS)
* Extended Display Title Spanish (Castilian) (Spanish PGS)

* Codec PGS
* Bitrate 20 kbps
* Language Spanish
* Language Tag es
* Title Spanish (Latin American)
* Display Title Spanish (PGS)
* Extended Display Title Spanish (Latin American) (Spanish PGS)

* Codec PGS
* Bitrate 18 kbps
* Language Swedish
* Language Tag sv
* Title Swedish
* Display Title Swedish (PGS)
* Extended Display Title Swedish (Swedish PGS)

* Codec PGS
* Bitrate 20 kbps
* Language Thai
* Language Tag th
* Title Thai
* Display Title Thai (PGS)
* Extended Display Title Thai (Thai PGS)

* Codec PGS
* Bitrate 19 kbps
* Language Turkish
* Language Tag tr
* Title Turkish
* Display Title Turkish (PGS)
* Extended Display Title Turkish (Turkish PGS)

* Codec PGS
* Bitrate 37 kbps
* Language Chinese
* Language Tag zh
* Title Chinese (Mandarin Traditional) (Commentary #1)
* Display Title Chinese (PGS)
* Extended Display Title Chinese (Mandarin Traditional) (Commentary #1) (Chinese PGS)

* Codec PGS
* Bitrate 29 kbps
* Language Korean
* Language Tag ko
* Title Korean (Commentary #1)
* Display Title Korean (PGS)
* Extended Display Title Korean (Commentary #1) (Korean PGS)

* Codec PGS
* Bitrate 34 kbps
* Language Japanese
* Language Tag ja
* Title Japanese (Commentary #1)
* Display Title Japanese (PGS)
* Extended Display Title Japanese (Commentary #1) (Japanese PGS)

* Codec PGS
* Bitrate 36 kbps
* Language Chinese
* Language Tag zh
* Title Chinese (Mandarin Traditional) (Commentary #2)
* Display Title Chinese (PGS)
* Extended Display Title Chinese (Mandarin Traditional) (Commentary #2) (Chinese PGS)

* Codec PGS
* Bitrate 26 kbps
* Language Korean
* Language Tag ko
* Title Korean (Commentary #2)
* Display Title Korean (PGS)
* Extended Display Title Korean (Commentary #2) (Korean PGS)

* Codec PGS
* Bitrate 31 kbps
* Language Japanese
* Language Tag ja
* Title Japanese (Commentary #2)
* Display Title Japanese (PGS)
* Extended Display Title Japanese (Commentary #2) (Japanese PGS)

* Codec PGS
* Bitrate 33 kbps
* Language Chinese
* Language Tag zh
* Title Chinese (Mandarin Traditional) (Commentary #3)
* Display Title Chinese (PGS)
* Extended Display Title Chinese (Mandarin Traditional) (Commentary #3) (Chinese PGS)

* Codec PGS
* Bitrate 27 kbps
* Language Korean
* Language Tag ko
* Title Korean (Commentary #3)
* Display Title Korean (PGS)
* Extended Display Title Korean (Commentary #3) (Korean PGS)

* Codec PGS
* Bitrate 32 kbps
* Language Japanese
* Language Tag ja
* Title Japanese (Commentary #3)
* Display Title Japanese (PGS)
* Extended Display Title Japanese (Commentary #3) (Japanese PGS)

* Codec PGS
* Bitrate 10 kbps
* Language Chinese
* Language Tag zh
* Title Chinese (Mandarin Traditional) (Commentary #4)
* Display Title Chinese (PGS)
* Extended Display Title Chinese (Mandarin Traditional) (Commentary #4) (Chinese PGS)

* Codec PGS
* Bitrate 7 kbps
* Language Korean
* Language Tag ko
* Title Korean (Commentary #4)
* Display Title Korean (PGS)
* Extended Display Title Korean (Commentary #4) (Korean PGS)

* Codec PGS
* Bitrate 8 kbps
* Language Japanese
* Language Tag ja
* Title Japanese (Commentary #4)
* Display Title Japanese (PGS)
* Extended Display Title Japanese (Commentary #4) (Japanese PGS)

MODERATOR EDIT: Code formatted for legibility

5

When attempting to playback from my Android smartphone (Pixel 6), I get the same results as my CCwGTV.

I also attempted to playback from the same PMS on an LG WebOS player, all tracks are played correctly.

6

@tominkozhimala

May I get a sample of this file ( a couple minutes worth is fine )

I’d like to give it to our Engineer who is in the TV lab and can see what’s happening when this is played.

7

What’s the best way to cut a sample of this file?

Also, for reference: I also tried several different MKV files with Dolby Vision and I’m getting the same results: TrueHD audio plays fine, AC-3 5.1 audio plays the next track in the list, and the last track makes the file not play at all

8

The easiest way is to cut a sample using dd

dd if=filename.ext  of=sample-for-chuck.ext bs=1M  count=X

X = number of blocks to give me.

If this is a high bitrate file, you’ll probably want 1024 (1GB)
If it’s low bit rate, 256 (256 MB) will be more than enough

you could use FFMPEG directly if you’re versed with it and can include all tracks.

9

dd is a nifty tool, thanks for the introduction

I created a 1gb sample for you since it’s a high bitrate. I tested and it includes the audio tracks as well. Let me know if you need any others. What is the best way to send this to you? The forum has a 30mb limit on files.

Also, did some more testing today with my other PMS. Same results when playing back multiple video files using either my Android smartphone or CCwGTV device. Audio tracks are offset by 1.

10

another quick update - it seems like this is only happening on the beta version of Plex for Android. I was able to go back to an older build and the issue isn’t happening anymore on either my Android smartphone or my CCwGTV.

beta: 8.28.0.29906 (issue exists)
stable: 8.27.1.29871 (issue doesn’t exist)

11

Link the sample here please ? I’ll point the dev right to this.

12

@tominkozhimala

The Android team is awaiting the sample.

Do you have it?

Easiest way to share a file of any significant size is Google drive / drop box / etc

Give us a HTTP download link from an external site

13

You can use this link: Dropbox - sample-for-chuck.mkv - Simplify your life

14

@greatdan565

Would you have s moment to check if the video segment shared here by @tominkozhimala also replicates the problem for you?

When you reply, I’ll be able to make both the Web and Android teams happy :rofl:

1 Like
15

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