Several Blu-rays discs that incorporate PIP secondary video and audio, use "DTS Express" audio (a more compressed special version of DTS) for the secondary audio - the DisneyNature series is a notable example.
I see that when using MakeMKV with such a disc, by default, the "DTS Express" is UNticked - and with good reason. If you select/tick the "DTS Express" audiostream and then save the (combined video and audio)file, the resultant .MKV file will not play.
Therefore, I'd ask:
Are the MakeMKV authors pursuing the ability to decode "DTS Express" audio? 
			
			
									
									
						DTS Express audiostreams
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				mike admin
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Re: DTS Express audiostreams
DTS express is preserved and saved to MKV same way as regular DTS or DTS-HD . But very few players can play this format for now.
			
			
									
									
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				setarip_old
 - Posts: 2136
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Re: DTS Express audiostreams
Then, hopefully, the sofware players will catch up soon - as they've begun to do with PGS subtitles ;>}