Bug: Transcoding causes buffering plus transcoding when sending to LG TV.

[yocker 1370]

I have a problem that when almost all sound gets transcoded it causes buffering on most clients.

Also Emby transcodes many sound formats when streaming to LG TV even though the TV can direct play if transcoding is disabled.

 

embyserver.txt ffmpeg-remux-f8b433e7-ded5-4fb3-ab53-abf4b3b3c3c4_1.txt embyserverNoTranscodeLG.txt

[Luke 42184]

Quote

Also Emby transcodes many sound formats when streaming to LG TV even though the TV can direct play if transcoding is disabled.

HI there, can you please provide a specific example?

How to Report a Problem

Thanks !

 

[yocker 1370]

7 minutes ago, Luke said:

HI there, can you please provide a specific example?

How to Report a Problem

Thanks !

 

The ffmpeg log has an example.

[brothom 205]

@yockerthe log states:

> TranscodeReasons=AudioCodecNotSupported

It looks like the audio you're trying to play is:

> English AC3 5.1

Given these two, it looks like your device cannot play AC3 (maybe some Dolby Digital variant?) with either 5.1 or 7.1. Your file's audio is:

19:22:12.982   Stream #0:1(eng): Audio: ac3, 48000 Hz, 5.1(side), fltp, 640 kb/s (default)
19:22:12.982     Metadata:
19:22:12.982       title           : English / AC3 / 5.1
19:22:12.982       DURATION        : 02:07:55.360000000
19:22:12.982   Stream #0:2(eng): Audio: truehd, 48000 Hz, 7.1, s32 (24 bit)
19:22:12.982     Metadata:
19:22:12.982       title           : English / TRUEHD / 7.1
19:22:12.982       DURATION        : 02:07:55.334000000

Have you tried playing other AC3 5.1 files to see if your TV supports them?

I know my TV (Samsung) also has issues with (E)AC3 so I tend to convert those to AAC.

[yocker 1370]

4 hours ago, brothom said:

@yockerthe log states:

> TranscodeReasons=AudioCodecNotSupported

It looks like the audio you're trying to play is:

> English AC3 5.1

Given these two, it looks like your device cannot play AC3 (maybe some Dolby Digital variant?) with either 5.1 or 7.1. Your file's audio is:

19:22:12.982   Stream #0:1(eng): Audio: ac3, 48000 Hz, 5.1(side), fltp, 640 kb/s (default)
19:22:12.982     Metadata:
19:22:12.982       title           : English / AC3 / 5.1
19:22:12.982       DURATION        : 02:07:55.360000000
19:22:12.982   Stream #0:2(eng): Audio: truehd, 48000 Hz, 7.1, s32 (24 bit)
19:22:12.982     Metadata:
19:22:12.982       title           : English / TRUEHD / 7.1
19:22:12.982       DURATION        : 02:07:55.334000000

Have you tried playing other AC3 5.1 files to see if your TV supports them?

I know my TV (Samsung) also has issues with (E)AC3 so I tend to convert those to AAC.

I tried playing the TrueHD track but it got transcoded.
I then turned off all transcoding on the server and it could direct play the TrueHD track no problem.

[brothom 205]

19 minutes ago, yocker said:

I tried playing the TrueHD track but it got transcoded.
I then turned off all transcoding on the server and it could direct play the TrueHD track no problem.

Maybe the Emby App you're running think your TV doesn't support AC3. Which version of the Emby App are you using? Is it the LG native app?

[Neminem 1593]

I guess it would be easier to troubleshoot if the App version was present in the logs

[GrimReaper 4843]

7 minutes ago, Neminem said:

I guess it would be easier to troubleshoot if the App version was present in the logs

Not sure what do you mean by that? 

Quote

2026-03-13 19:26:38.595 Info SessionsService-0HNK15NPD4CK3:00000002: http/1.1 POST http://10.0.0.241:8096/emby/Sessions/Capabilities/Full?X-Emby-Client=Emby for LG&X-Emby-Device-Name=LG Smart TV (OLED55C34LA)&X-Emby-Device-Id=3dfac2ff-6bdc-449b-bdbf-c962d963e73d&X-Emby-Client-Version=1.0.50&X-Emby-Token=x_secret3_x&X-Emby-Language=en-gb&reqformat=json. Source Ip: host1, UserAgent: Mozilla/5.0 (Web0S; Linux/SmartTV) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.6099.270 Safari/537.36 WebAppManager

 

Quote

App: Emby for LG 1.0.50 LG Smart TV (OLED55C34LA) User-Agent: Mozilla/5.0 (Web0S; Linux/SmartTV)

 

[Neminem 1593]

11 hours ago, GrimReaper said:

Not sure what do you mean by that? 

Ohh wow How did I mis that.

[GrimReaper 4843]

8 minutes ago, Neminem said:

Ohh wow How did I mis that.

Happens to everyone, I also have my "moments" every now and then, literal .

[Happy2Play 9799]

The app is not reporting it supports TrueHD

&AudioCodec=ac3,eac3,aac,mp3

This topic needs moved to LG TV section.

 

[SamES 1079]

LG does not allow apps to DirectPlay TrueHD. TrueHD is only supported when played from an input source via HDMI.

The reason why it 'appears' to work when you disable transcoding on the server is this. When the LG TV encounters an audio track that is not supported, it automatically plays the next supported track in the file.  It does not report this, so Stats for Nerds will show TrueHD as that is what we think is playing, but that is not what is being played.

Test this by finding (or creating) a file with only a single TrueHD audio track and no other audio tracks, or find a file where the audio track after the TrueHD track is either a different language or a commentary track. In this case, you will be able to tell which track is really playing.

[yocker 1370]

1 hour ago, SamES said:

LG does not allow apps to DirectPlay TrueHD. TrueHD is only supported when played from an input source via HDMI.

The reason why it 'appears' to work when you disable transcoding on the server is this. When the LG TV encounters an audio track that is not supported, it automatically plays the next supported track in the file.  It does not report this, so Stats for Nerds will show TrueHD as that is what we think is playing, but that is not what is being played.

Test this by finding (or creating) a file with only a single TrueHD audio track and no other audio tracks, or find a file where the audio track after the TrueHD track is either a different language or a commentary track. In this case, you will be able to tell which track is really playing.

Will try, thanks!

[yocker 1370]

2 hours ago, SamES said:

LG does not allow apps to DirectPlay TrueHD. TrueHD is only supported when played from an input source via HDMI.

The reason why it 'appears' to work when you disable transcoding on the server is this. When the LG TV encounters an audio track that is not supported, it automatically plays the next supported track in the file.  It does not report this, so Stats for Nerds will show TrueHD as that is what we think is playing, but that is not what is being played.

Test this by finding (or creating) a file with only a single TrueHD audio track and no other audio tracks, or find a file where the audio track after the TrueHD track is either a different language or a commentary track. In this case, you will be able to tell which track is really playing.

That was it, many thanks.