I am having trouble playing files encoded using AAC5.1 in Roku.  Roku ultra simply down mix it to stereo and hence the surround sound is lost.   I read some prior articles discussing about an option to transcode AAC to AC3 if 5.1 channel is present. Is that feature supported? I am using Emby for little over a year and always had this issue with no solution. (Roku Ultra #4660)   https://emby.media/community/index.php?/topic/54801-roku-premier-and-aac-51/   I recently installed Plex and it