I have been trying to narrow down the source of Dolby True HD /Atmos audio drop outs , anyone else experiencing this ? running Plex media player for Windows 10 on a Asus 4th gen quad core i5 with a GTX 960 video card Plex version 1.1.4 audio being decoded by a Marrantz 7702 preamp. I have hardware decoded checked and was wondering if i should have it disabled or not ?
The hardware decoding setting applies only to video, so either should work.
Can you post a playback log?
hmm let me dig that up ! … where might i find this log info ?
It’s documented here: https://support.plex.tv/hc/en-us/articles/207338748
I have a similar issue (posted in another thread), but only at certain intervals (55ish minutes into movie, then about 35 minutes later, then about 15 minutes later). I posted a log but to no avail…not glad that someone else is experiencing this, but glad it’s still something to be addressed. At this point I have to use MPC HC with MKV’s that utilize TRUEHD, as PMP doesn’t seem to be up to the task. Unfortunate.
Hope your log(s) reveal something that mine did not.
interesting , I’m going to try and repeat the issue and post the logs
Curious - are you bit-streaming (pass through) the audio to your receiver over HDMI or having Plex do the audio transcode?
I just installed PMP the other night to see how far along it’s come since the beginning. Tonight, watching a TrueHD 7.1 - Atmos movie, I noticed this 3-4 times. It was reminiscent of the old sync issues in PHT with I believe TrueHD as well. I haven’t had this issue with any DTS, DTS-HD or Dolby Digital playback, just the TrueHD. Attached is the PMP log for tonight.
I didn’t notice the exact time stamps where the dropouts occurred, but I’d have to say they were roughly the same spots that prange is mentioning in his post. I did stop after the first or second one and check audio settings, then restarted at the point I left off.
I’m bit-streaming to the audio to my receiver over HDMI.
PS - Looking through the log before I post it, I don’t see any evidence of anything going on unfortunately. Nothing obvious at least.
I’m not seeing anything either.
So far, it seems to be happening only with TrueHD passthrough/bitstreaming, and only on Windows. Or does anyone experience this in other cases?
Can you try with decoding to PCM? (Just uncheck the TrueHD checkbox in the PMP audio settings.)
Yeah I can do that, might be a few days before I can report back though. Hopefully someone else is able to test in tandem.
@Warmongerx said:
Yeah I can do that, might be a few days before I can report back though. Hopefully someone else is able to test in tandem.
yes it seems its just with TrueHD passthrough , about 3 or 4 drop outs per film . thanks for jumping in on this 
I am afraid i believe this is happening to me as well, at the intervals discussed above, but when i went back and attempted to rewind to try to reproduce it, it did not happen that i noticed.
The log showed nothing. This was on a truehd/atmos track, windows, bitstreaming.
I think this may be bigger than just PMP having issue. I went back and used OpenPHT last night to watch some TV series and noticed similar issues. It wasn’t drop out though, it was crackling of the speakers, almost like a loose connection. After I realized that the show I was watching was TrueHD (Spartacus) I moved to watch a movie in DTS-HD (Pacific Rim) and never once had an issue during the entire length of the film.
I’ll be watching more shows/movies this evening and will report back tomorrow on my findings. I suppose for reference, I should load up Spartacus in the blu ray player to make sure it’s not something else. I’ll also switch PMP over to PCM to see if the issue persists or not.
The Walking Dead is also in TrueHD, might try that as well.
For reference I’m on PMS version 1.1.4.2757
I’m wondering if this is just a Plex windows 10 issue or just windows ? whatever the case I’m hoping it can be addressed , does this also happen with the older Plex Home Theater ? DTS streaming has never been a issue for me
Just to add my not helpful info.
I have found that PMP completely drops TrueHD about once per movie. I simply stop the movie and restart it from the same position and it works again. Weird that it only happens once, but others are getting it 3 or 4 times.
the drop outs I’m describing are very split second and then continue fine
I suspect it’s 1 TrueHD packet getting mangled or so, which would explain a very short dropout. Unless you use the PMP video sync mode that drops audio, PMP should not be doing this. It’s hard to tell at which layer this goes wrong: PMP, the audio driver, the HDMI connection, the receiver… it’s also very hard to reproduce and test.
If anyone notices any differences in dropout frequencies (like once per movie, 3 or 4 times per movie), that would be appreciated.
Hey guys, I have the same issue with 1-4 audio cracks per true HD movie but even more annoyingly is that all movies got audio track delay. Cant remember having it on ealier releases of PMP. Sync mode audio option doesnt seem to so much there and it feels bad to resample the audio track when its DTS HDMA/true HD. I have all the audio codec types on pass through since they are all supported and bit streamed.
Windows 10 on HTPC with more than enough juice for PMP hooked up to Onkyo SR444 receiver. Got 5.0 speaker setup, latest PMP version1.1.4
Yeah it was at least 3, maybe 4 for me on a 2h11m movie. I’ll get to test some more in another week. Just been too busy. Would it help to include PMS logs during the same time frame? As I mentioned. I’m noticing issues in other players as well that didn’t have before just with TrueHD streams.
going to test this again as well over the weekend
