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jdk1980
Level 7

ac3 in mkv stopped in roku media player

I’ve used the roku sd, hd, premiere, and streaming stick plus on several tv’s with no issues.

About two or three months ago, with no change in setup, three roku devices playing ac3 audio in an mkv with “roku media player” via a server running “minidlna” just stopped working.  Only the stereo aac is available for both 5.1 and 2.0 ac3, actually I have a few 2.0 flac sources that also stopped working.

if it were one set it would be different, but this is three different tv’s with three different roku streamers.

has anyone else had a sudden stop of mkv audio support for anything other than 2 channel aac?

 

2 Replies
CParticle
Level 7

Re: ac3 in mkv stopped in roku media player

I'm having the same problem with some of the mkv files.  Looking at the audio though and on the web it appears to be with 5.1 Audio.  From a random webpage I found this 

"Roku supports 2ch AAC, 2ch MP3, pass-through AC3, and DTS" 

 

It appears that if the AAC or AC3 is 5.1 no audio is played.  I also some some talk about optical cables for speaker setups related to the same 5.1 types.  I'm guessing that the chain of connections and file type need to fully support 5.1 for things to work.  The easiest solution is convert the Audio in the mkv.

I'm still trying to figure this out myself but maybe this helps someone.

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Meaje
Level 7

Re: ac3 in mkv stopped in roku media player

No at this point now it will not even attempt to pay the file if the only audio is ac3. I've recorded files to check this behavior and it's only the ac3 format that seems to cause issues. If the file has another audio stream included say aac then it will play but if it is encoded with ac3 stereo then it crashes out inelegantly.  As a result I'm having to go through my library to find all the files that are ac3 only and recode them into a format that roku likes(boo).

 

BTW: As far as I can tell the pass through for roku is broken as well. I have my roku going into a home theater audio box that can easily decode AC3, DTS, etc so the idea that pass through works is also debunked (in my case at least, perhaps there is some setting i missed...)

Edit 2020-11-19: Further weirdness is that my Roku players don't mind AC3 5.1 audio if the container is mpeg4. I stumbled upon a file where it had the video encoded as a mp4 stream with the only audio being a AC3 5.1 sub stream. Now I'm officially confused with this issue. A file that is encoded as a Matroska format h.264/h.265 video with only AC3 audio streams will not play but the same file encoded as a MP4 video stream no issues... WTF?


@CParticle wrote:

I'm having the same problem with some of the mkv files.  Looking at the audio though and on the web it appears to be with 5.1 Audio.  From a random webpage I found this 

"Roku supports 2ch AAC, 2ch MP3, pass-through AC3, and DTS" 

 

It appears that if the AAC or AC3 is 5.1 no audio is played.  I also some some talk about optical cables for speaker setups related to the same 5.1 types.  I'm guessing that the chain of connections and file type need to fully support 5.1 for things to work.  The easiest solution is convert the Audio in the mkv.

I'm still trying to figure this out myself but maybe this helps someone.


 

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