Jump to content


Photo

HD audio downgraded due to 2 Mbps max settings for internet stream

HD audio downgrade transcode LG limit setting True hd DTS HD features

  • Please log in to reply
11 replies to this topic

#1 SuissoNaBisso OFFLINE  

SuissoNaBisso

    Member

  • Members
  • 15 posts

Posted 16 January 2020 - 04:13 AM

Hi

 

So I have a remote server connected with gigabit connection, at home I'm using the Emby app on LG 65C9 TV running WebOS 4.5.

 

Use the server with UHD movies mainly containing HD audio like DTH-HD MA, Dolby True HD or event Dolby True HD Atmos.

 

The problem is that on this Emby player app, in the settings, the maximum quality we can set for audio (with internet stream) is 2Mbps and for certain audio tracks this is not enough hence the server is forced to transcode / downgrade the audio to AC3 format with such a low bitrate...

 

Example yesterday I did several tests with various movies and different audio bitrate :

  • Quantum of Solace with DTS-HD MA track with bitrate of 1536 kbps = no trasncoding at all, stats for nerds well show that the DTS HD signal is decoded and sent to the TV
  • Skyfall with DTS-HD MA track with bitrate of 1536 kbps = no trasncoding at all, stats for nerds well show that the DTS HD signal is decoded and sent to the TV
  • Fantastics Beast, Crimes of Grindelwald with True HD ATmos track with bitarte of 3457 kbps = audio is being transcoded and dowgraded to AC3 format at around 500 kbps...

 

Is there anyway to break this max setting for audio of 2 mbps ?

 

My TV is compatible with HD formats including Atmos but I can't enjoy these tracks due to this limitation of Emby app...any update to fix in the future ? if Audio max settings offered was 4 or 5 Mbps that would make it !

 

Thanks

 

 

 



#2 SamES OFFLINE  

SamES

    Advanced Member

  • Members
  • 1157 posts
  • Local time: 07:54 AM

Posted 16 January 2020 - 05:08 AM

You may find that the issue is that TrueHD is not enabled for DirectPlay in the app. To the best of my knowledge, no one has yet proven they can send a TrueHD stream via eArc from their TV to their receiver, so in that case, we must always convert TrueHD audio.

What model is your TV? Are you certain that if you play a TrueHD track on you TV locally that TrueHD can be sent to your receiver? Have you tried it?

Edit: Sorry just saw the model in your post

Edited by SamES, 16 January 2020 - 05:10 AM.


#3 SuissoNaBisso OFFLINE  

SuissoNaBisso

    Member

  • Members
  • 15 posts

Posted 16 January 2020 - 05:14 AM

You may find that the issue is that TrueHD is not enabled for DirectPlay in the app. To the best of my knowledge, no one has yet proven they can send a TrueHD stream via eArc from their TV to their receiver, so in that case, we must always convert TrueHD audio.

What model is your TV? Are you certain that if you play a TrueHD track on you TV locally that TrueHD can be sent to your receiver? Have you tried it?

Edit: Sorry just saw the model in your post

 

Well didn't try to play locally a similar movie, will try, but checking at the audio setting limit and the various bitrates used for DTS- HD and then True HD it felt obvious for me that this was due to this bitrate limitation...I guess the same settings exist on an Nvidia Shield right ? are they able to direct play True HD with bitrate over 2 Mbps on this device ?



#4 SamES OFFLINE  

SamES

    Advanced Member

  • Members
  • 1157 posts
  • Local time: 07:54 AM

Posted 16 January 2020 - 05:27 AM

Well didn't try to play locally a similar movie, will try, but checking at the audio setting limit and the various bitrates used for DTS- HD and then True HD it felt obvious for me that this was due to this bitrate limitation...I guess the same settings exist on an Nvidia Shield right ? are they able to direct play True HD with bitrate over 2 Mbps on this device ?

 

I recall the Nvidia shield might be the only option to support TrueHD (@FrostByte) but not a device I'm familiar with.  I wasn't aware of a bitrate limitation on the audio track for DirectPlay, I'm fairly sure the limitation is on the total stream only, but probably a limit put on the audio stream size when transcoding.

 

There is much discussion on forums regarding TrueHD on C9.  This is just one, but they are all similar in theme : https://lgcommunity....ugh-to-receiver


Edited by SamES, 16 January 2020 - 05:28 AM.

  • SuissoNaBisso likes this

#5 SuissoNaBisso OFFLINE  

SuissoNaBisso

    Member

  • Members
  • 15 posts

Posted 16 January 2020 - 05:32 AM

I recall the Nvidia shield might be the only option to support TrueHD (@FrostByte) but not a device I'm familiar with.  I wasn't aware of a bitrate limitation on the audio track for DirectPlay, I'm fairly sure the limitation is on the total stream only, but probably a limit put on the audio stream size when transcoding.

 

There is much discussion on forums regarding TrueHD on C9.  This is just one, but they are all similar in theme : https://lgcommunity....ugh-to-receiver

 

Ok then I'll have to get myself an Nvidia Shield for that, just need to be sure this well direct play True HD Atmos signals first

 

Thanks !


  • SamES likes this

#6 SamES OFFLINE  

SamES

    Advanced Member

  • Members
  • 1157 posts
  • Local time: 07:54 AM

Posted 16 January 2020 - 06:40 AM

Ok then I'll have to get myself an Nvidia Shield for that, just need to be sure this well direct play True HD Atmos signals first

 

Thanks !

 

When @FrostByte is online he should be able to confirm Shield capability


  • SuissoNaBisso likes this

#7 FrostByte OFFLINE  

FrostByte

    Advanced Member

  • ForumMod
  • 4679 posts
  • Local time: 03:54 PM
  • LocationThe UP

Posted 16 January 2020 - 08:04 AM

I've got the 2019 Shield Pro and it will Direct Play remuxed 4K (usually very high bitrate) movies with TrueHD Atmos and DTS-X as long it's plugged into a receiver that supports both.  When you set up your Shield it will autodect the sound formats that your receiver/soundbar supports (you can also override those in settings). 

 

Since my Samsung TV doesn't have eARC I use the Shield when I want to play movies with multi-channel HD audio and passthrough the video to the TV.

 

My setup

Shield (HDMI1) / XB1X (HDMI2) --> Soundbar --> TV

 

I play all my movies locally, don't play anything over the Internet.

 

------

 

Have you tried turning off "Allow video playback that requires conversion without re-encoding" on the server to see what happens?  If you do that the server shouldn't convert the audio to AC3 when playing.  Then if your hardware or network is the issue it will just fail.


  • SamES likes this

#8 SuissoNaBisso OFFLINE  

SuissoNaBisso

    Member

  • Members
  • 15 posts

Posted 16 January 2020 - 08:09 AM

I've got the 2019 Shield Pro and it will Direct Play remuxed 4K (usually very high bitrate) movies with TrueHD Atmos and DTS-X as long it's plugged into a receiver that supports both.  When you set up your Shield it will autodect the sound formats that your receiver/soundbar supports (you can also override those in settings). 

 

Since my Samsung TV doesn't have eARC I use the Shield when I want to play movies with multi-channel HD audio and passthrough the video to the TV.

 

My setup

Shield (HDMI1) / XB1X (HDMI2) --> Soundbar --> TV

 

I play all my movies locally, don't play anything over the Internet.

 

------

 

Have you tried turning off "Allow video playback that requires conversion without re-encoding" on the server to see what happens?  If you do that the server shouldn't convert the audio to AC3 when playing.  Then if your hardware or network is the issue it will just fail.

 

No didn't try to force the direct play but I will later today.

 

Thanks for the tips !


  • SamES likes this

#9 Luke OFFLINE  

Luke

    System Architect

  • Administrators
  • 148996 posts
  • Local time: 03:54 PM

Posted 16 January 2020 - 02:43 PM

Please make sure to read the help text underneath the option before doing that. Let us know how you get on. Thanks.



#10 Luke OFFLINE  

Luke

    System Architect

  • Administrators
  • 148996 posts
  • Local time: 03:54 PM

Posted 16 January 2020 - 02:45 PM

 

 

 
 
 
The problem is that on this Emby player app, in the settings, the maximum quality we can set for audio (with internet stream) is 2Mbps and for certain audio tracks this is not enough hence the server is forced to transcode / downgrade the audio to AC3 format with such a low bitrate...

 

This setting is for music only. It has no effect on audio tracks that are embedded within videos.

 

Let's look at an example. Thanks.



#11 SuissoNaBisso OFFLINE  

SuissoNaBisso

    Member

  • Members
  • 15 posts

Posted 17 January 2020 - 05:01 AM

Ok thank you will do some tests during the week end and I'll keep you posted

 

Thanks



#12 Luke OFFLINE  

Luke

    System Architect

  • Administrators
  • 148996 posts
  • Local time: 03:54 PM

Posted 18 January 2020 - 05:18 PM

Let us know how you get on. Thanks !







Also tagged with one or more of these keywords: HD audio, downgrade, transcode, LG, limit, setting, True hd, DTS HD, features

0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users