I'm fine for what mp3 concernes. There is only one scenario where I use MKA. The reason lies in the fact that ROKU 3 will not play DTS sound tracks unless they are in a Matroska container. If I convert to flac or wav, and stream it from my media server to ROKU 3, it will be considered as MP3 and will be played in Stereo. But then we get the issue that there does not seem to be a straight forward procedure for MKA metadata. This for information