Forum Discussion
renojim
3 years agoCommunity Streaming Expert
AAC 5.1 is not supported on (some/many/all?) Roku devices, so it's transcoding and packaging it in MKV. Whether you can force it to direct play will depend on all the equipment involved.
You can read this for some not so helpful information on supported codecs:
https://support.roku.com/article/208754908