Convert DTS audio to AC3 to play on LG TV
 

My LG TV plays most MKV files from USB.

Some MKV files plays the video but I get an "unsupported audio" error. My research so far tells me that I have to convert the audio from DTS to AC3. I looked at some tutorials online that were old (dated 2007 and older)

It seems to be a multi-step/difficult process involving a few programs. Is there an easy way to do this?

Using AVIDEMUX, you can re-encode the audio, but leave the video source intact. Just one step. Set the video to "Copy" and set the audio to whatever is compatible with your player.

Another way is if you have lots of files is to get an inexpensive player like patriot box office