If you have linux (or know someone who has), get a look at:
http://en.wikipedia.org/wiki/FFmpeg
The command will look something like this:
ffmpeg -i input.mkv -c:v libx264 -c:a libfaac out.mp4
Hi I wanted to know how to convert a .dts file (audio only) into a .mka file (container audio only). I have a audio file in .dts but my WD TV Live doesn't play it. Maybe if I put it in a container mka it would play? Any help or suggestions?