Yes, my tests were mainly on VLC and MPC which returned the same results. Not to mention playing clips off browsers (via youtube.com) does display the audio giltch as well. Hence I would say it is not limited to only a certain application. However while playing videos fitted with Dolby TrueHD or DTS HD, the audio would never EVER break, something to consider about.
Ah, ok, good to know.
That's interesting about the Dolby DTS, I assume you're bitstreaming?
I know this is annoying, but in order to isolate the issue, is there any chance you've tried either a mini DP -> HDMI cable/adapter or a USB Type-C -> HDMI cable/adapter? Maybe you can purchase one that allows refund w/in 30 days or so to test?
If you can't do that, that's fine, but I'm guessing it's an HDMI issue as we've seen other HDMI issues in the past be solved with the above adapters.
I have already tried that option as well, using a club3D mini displayport 1.2 to HDMI 2.0 adapter. This also gave me the audio glitches too. However I have not gotten myself a type-C to HDMi adapter, would have doubt of it working too unfortunately.
Yeah, I'm doing bitstreaming to my AV amplifier for videos that have DTS HD/Dolby TrueHD audio stream. Those did not give me any issues.
Good news ! I have tried with a USB-C to HDMI adapter (running at 1920x1080p60) and the audio glitch appears to be gone completely. Specifically using the digital AV adapter made by Apple themselves. Besides the short audio blackout during every start of video, the audio had never ceased to stream which is a good thing. HDMI cables and the input point on the AV amplifier were the same.
USB-C -> HDMI adapter @ 1920x1080p60 = Flawless
USB-C -> HDMI adapter @ 3840x2160p30 = Flawless
Displayport -> HDMI @ 1920x1080p60 = Minimal glitch
Displayport -> HDMI @ 3840x2160p60 = Frequent glitch
Displayport -> HDMI @ 4096x2160p60 = Minimal glitch
HDMI only @ 1920x1080p60 = Frequent glitch
HDMI only @ 3840x2160p60 = Frequent glitch
HDMI only @ 4096x2160p60 = Frequent glitch
Update: The Apple USB-C digital AV adapter works fine for PCM output, however it would not work for any bitstreaming audio streams. This seems to bring us closer to the cause of issue. As the Apple adapter could only reach 3840x2160p30 and only PCM output, I went and got myself a Club3D USB3.1 Type C to HDMI 2.0 adapter in my attempts to resolve those gaps. Without a doubt 3840x2160p60 works and bitstream is back, BUT audio glitches returned as well ! So what I can roughly conclude here is that :-
1. Either the audio stream from the NUC is corrupted which is switching in between bitstream and PCM
2. NUC could not handle the HDMI2.0 format ?
3. Or possibly the HDMI2.0 firmware update had broke something on the NUC ?
Thanks for the testing Calvinz.
This is so very strange.
I know this will be a BIG pain, but is there any chance you can bring your NUC to a friends or a stereo store and test it there? Both an HDMI 1.4 or 2.0 reciever would be best, but whatever you can do is what you can do. Completely understand if not.
Actually I have already tested that scenario before. I connected the NUC towards the TV which logically only supports stereo ouput and no bitstream audio support, the audio glitch is no longer present with either HDMI 1.4a or 2.0 cables.
Thanks Calvinz, and while it's certainly a good data point, it's not quite testing the same thing, but for lack of other testing it's better than nothing!
The problem is I can reproduce it here, so I'm trying to figure out how to do that.
So we're at least at the same starting point, can we test the same file? There are several online spots that allow you to download test files. For example, 2D Demo Trailers (HD) , DTS Demo Trailers (DTS:X, DTS-HD MA, DTS 7.1, DTS 5.1) , Jellyfish Bitrate Test Files , and http://kodi.wiki/view/Samples .
I do have the demo files from them as well, what I noticed were streams that were only "Dolby Digital 5.1 or DTS Core 5.1" had the tendency for the issue to occur. Whereas streams with "Dolby TrueHD or Dolby ATMOS, DTS HD-MA or DTS X" had no such issues. Have you attempted to replicate the problem by just playing simple audio file through a bitstream capable amplifier ? Because the issue tends to occur lesser with bitstream audio, it's more frequent on pure PCM stereo streams.
For the records:
OS : Windows 10 Pro 64bit @ Anniversary update
MPC : version 1.7.10 64bit
No other software decoders used besides the one that came with MPC.
Update: I tried the following files from Jellyfish
1. http://jell.yfish.us/media/jellyfish-55-mbps-hd-h264.mkv - video playback was fine, random audio glitches
2. http://jell.yfish.us/media/jellyfish-140-mbps-4k-uhd-hevc-10bit.mkv - video playback stuttering, blank audio for first half of the playback as the audio stream is constantly glitching
3. http://jell.yfish.us/media/jellyfish-400-mbps-4k-uhd-hevc-10bit.mkv - video playback stuttering, no audio besides the NUC's fan whirring up to maximum