DTS audio on LG TV

Hi.
Can anyone help me how to play .mkv files with DTS audio on my LG TV (LX650N)

My current profile is:
<Profile id="14" name="LG TV" extendsProfileId="1">
<SubtitlesMimeType>text/srt</SubtitlesMimeType>
</Profile>

I tried both examples shown at
http://www.serviio.org/index.php?option ... icle&id=24

[zip]

The LG devices don't support transcoded files (due to a bug in their software), so you're out of luck (viewtopic.php?f=12&t=546&start=40#p11160) - you'd have to transcode the file manually to AC3 or AAC audio.

how would you go about transcode that manuely??