Why isn't the default audio track set by default as default?

[justinrh 285]

I added two titles to my movie library, and both had the AAC audio track set but the AC3 track is marked as "default".  Why wasn't the AC3 track set?  What can cause this?

Edited 34 minutes ago by justinrh

[Suliamu 52]

With mkvtoolnix you can open the specific file and make the track(s) you want the default. 
It can be also done programmatically with a script. 
And when just changing this aspect the file must not be transcoded so it is a very fast process. 
It is best to change everything regarding this directly in the files otherwise when you make a reinstall or change to some other system you would have to do it everything again. 
And when this is already set accordingly i would guess that your client might be automatically choosing Stereo preferably to 5.1. Which client is this? There exists a "Downmix option" in certain clients afaik which could maybe do this. 

Edited 33 minutes ago by Suliamu

[justinrh 285]

web app and Android TV

[ebr 16552]

Hi.  Each app will select the best audio for its environment - based on your settings.

What are your audio default settings?

[justinrh 285]

12 minutes ago, ebr said:

Each app will select the best audio for its environment - based on your settings.

Hmm.  ATV is running on a Shield with 5.1 output.  I guess my PC for web app has stereo.  I don't see any pertinent audio settings in either app.

This is a strange one because the 5.1 track normally is set by default.

If I change the track in one app, will other apps inherit that change?  Or does each app keep its own title settings?