## Duplicate DTS and encode AAC
 ```
 ffmpeg -y -i <input> -strict -2 -map 0 -c copy -map 0:a0 -c:a:1 aac -b:a 192k -ac 2 -f matroska <out>
 ```

  ## Attach Cover Art
 ```
 function addcover(){
 ffmpeg -i $1.mkv -map 0 -c copy \
        -attach $1-poster.jpg -metadata:s:t mimetype=image/jpeg -metadata:s:t filename=cover.jpg \
        -attach $1-fanart.jpg -metadata:s:t mimetype=image/jpeg -metadata:s:t filename=fanart.jpg \
        $1.plus.mkv
 }
 ```
 Note: gerbera doesn't read the jpg. :(
     Why?