with popcorn mkv audioconverter it is easy to convert dts in mkv to 5,1,you can convert folder or file,put 10 mkv files in a folder and let the program do its work,just overwrite the old file,keep the dts file or let the program throw it away,your choise,I use version 1.79.1 it can convert dts vorbis aac and flac
