Weird. Must have broken something myself. Lol
Here it is on google drive
https://drive.google.com/a/foofoo.info/file/d/1GF52afDW4OMYR7BKd0FXk-AkJpbAW04k/view?usp=drivesdk
Thanks, but unfortunately the sharing permissions youāve setup for GDrive isnāt allowing me access. Youāll need to modify the Sharing Dialog to allow others with the link to view/download.
Ian
It was Cloudflare causing the issue, fixed it. The original links are working again, but the google one is the same anyway.
Hope it sheds some light.
Ok, iālol double check, this is really being a pain tonight! Can you confirm the original links work now while I double check google.
Looking at the logs, I can see our video player log out the video and audio streams that itās found being provided by Plex Media Server:
02-05 20:25:38.088 i: [FF] VideoStream[0-h264] 1920x1080 [SAR 1:1, DAR 16:9]. H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 - Unknown Profile (video/avc), 35.2 Mbps -54 secs 0.00fps, No Title / Unknown (null), 1 / 82 bytes, .
02-05 20:25:38.089 i: [FF] AudioStream[1-ac3] 6 channels over 1551 (5.1(side)), 48000 Hz, 0,0 padding. ATSC A/52A (AC-3) - Unknown Profile (audio/ac3), 35.2 Mbps -54 secs 0.00fps, No Title / Unknown (null), 0 bytes, .
Interestingly, on your setup, I see that DTS is disabled and now the server is correctly transcoding to AC3. Initially I thought that maybe our own AC3 decoder is actually kicking in and decoding to 2 channel PCM. However, after digging more if that was the case, I would have expected to see something else in your logs to confirm thatās the case.
Just to sanity check, when you play something with the original audio being AC3 and the video direct plays, it outputs AC3 correctly instead of 2 channel PCM? At the moment, if I had just seen this logs, I would have guessed your TV is handling the AC3 by decoding it and then outputting 2 channel PCM via Optical. But given you said other AC3 content goes all the way through Optical fine, that shouldnāt be the case hereā¦
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Hang on, I think Iām leading you up a slight garden path here.
Yes, the optical setting appears to be working correctly upstairs, showing as a transcode to ac3.
Downstairs in the Sony tv, itās different though, itās definitrly going to aac stereo, let me go start a playback there and grab a log.
Sorry.
Is the Sony TV and Sony Android TV? Or a SHIELD/Android TV connected to a Sony TV?
@IanDBird Not an android tv, itās a Sony kdl 55w905a .
I think this is a codec issue, I played a couple of dts only files and they converted correctly, the film I originally tried was a dts 7.1 file which should have downmixed to ac3 but instead went to stereo.
Hereās a log, I played a couple of dts films which correctly played, then I played ready player one right at the end and it goes to stereo.
Itās very nearly working properly, just some codecs not behaving!
Thanks, I can see in the logs that the client isnāt requesting AC3 and therefore is receiving just a 2 channel AAC track:
02-05 21:32:19.005 i: [FF] VideoStream[0-hevc] 1920x800 [SAR 1:1, DAR 1920:800]. H.265 / HEVC (High Efficiency Video Coding) - Unknown Profile (video/hevc), 16.7 Mbps -54 secs 23.98fps, No Title / Unknown (null), 0 bytes, .
02-05 21:32:19.006 i: [FF] AudioStream[1-aac] 2 channels over 3 (stereo), 48000 Hz, 0,0 padding. AAC (Advanced Audio Coding) - Unknown Profile (audio/mp4a-latm), 16.7 Mbps -54 secs 0.00fps, No Title / Unknown (null), 1 / 2 bytes, .
Itās strange, because the client is not telling the server that it supports AC3 (which is why itās not getting it). If Optical is enabled with AC3 enabled, iām not sure at the moment why it wouldnāt report it as such to the server.
Iām gonna need to spend some time debugging to see if I can reproduce here. Itās getting late though in the evening, so iāll likely have to pick this back up tomorrow morning.
Sorry about this, iām scratching my head looking at the code and it āshouldā be doing the right thing. Thanks for your patience and hopefully I can figure it out tomorrow.
No problem. The file exhibiting this shows as having a DTS-HD MA 7.1 soundtrack.
Normal DTS 5.1 is correctly playing with a transcode to AC3.
Iām having this same exact issue
For some reason audio passthrough just stoppped working. I get video and sound everywhere else. but then once i force surround in nvidia shield tv settings. i dont get sound. and my panasonic sa-bt300 supports basically every codec.
Having the same problem as @fizzyade, AAC 5.1 audio transcodes to AC3 5.1 audio but 7.1 transcodes to stereo. Seems to be anything with 7.1 sound. Thanks for all the work on this issue, itās almost there!
With a new set of eyes, and a cup of coffee, I can see the issue. The code is checking if the device is setup to support AC3 with the original channel count of the source media. In the case of 7.1 (so 8 channels), itās returning ānoā becauseā¦ well, AC3 never supports 8 channels. Iāll get the issue resolved as soon as I can and get another beta out.
Ian
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Huzzah. Feel your pain on that one, been in the position of staring at code for hours wondering why something doesnāt behave as expected and then next morning I straight away spot the issue!
Fresh eyes FTW.
Looking forward (as Iām sure you are) putting this one to bed! Thank you so much for all your efforts, this has been a massive issue for as long as I can remember and now Plex is finally going to be compatible with a Sonos system.
I (think/hope!) iāve fixed the issue now, itās been reviewed and tested internally and landed in our codebase. Iāll ask the team to ensure a new beta gets pushed later today - theyāre working on some additional issues reported via the forums.
Thanks again for raising, and your patience
Ian
2 Likes
Once again, thanks for all your efforts on this.
Also thank you for asking for a new beta push with the fix, I didnt fancy waiting for another couple of weeks for a fix!
Just tried with some EAC5.1 files which also gave me silence originally, now play perfect with a transcode to AC3!
Hopefully itās the end of either silent films or me having to tell them to change the audio stream to AC3!
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Itās one of the advantages of being the boss 
The beta period is ~2 weeks where we continue to update the RC with fixes identified internally and via the forums, then once things settle we start a staged rollout to production so everyone gets the update. Then a week later, a new first beta comes out and we start this whole process againā¦
Ian
Legend, just installed the new beta and itās working!
FINALLY, you have no idea how annoying this issue has been for anybody with a Sonos system, but itās now transcoding multichannel to ac3!
Thank you so much for doing this, putting up with my tagging and pestering and occasional bad mood!
This is a game changer for me, canāt tell you how much this improves plex for me.
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@IanDBird I applied for beta access quite a while back and havenāt heard anything, any chance of getting somebody to look and see if they can add me so that I donāt have to keep side loading beta versions.
Or tag the person who needs to be tagged.
Awesome, great (and relieved!) to hear. Thanks for letting us know.
Sure, sorry about this. The beta requests need to be processed manually. Iāll ask the team to try and process any queue ~tomorrow so that youāll receive future beta updates easier. After youāre added to the list, youāll need to opt-in via Google Play too.
If you havenāt already, make sure you review the app via the store
Ian
2 Likes
