Newest Beta Dolby Vision Issue

[fizban11]

Refer back to post #58 in this thread posted by @sixones.

As far as I know, there has been no new beta update for attempting a fix, yet DV support was added to the latest general release.

[Orange_GT3]

Does anyone have Days of Thunder 4K?

I cannot get my rip to play back at all if using the TrueHD sound track, i.e. no sound and no video.

If I select the AC3 sound track, then it works perfectly with DV.

[jerryfudd]

Feel late to the party on this one but today I noticed that my Plex for Shield TV updated to 8.8.0.21200 and started triggering the Dolby Vision flag - but only sometimes.

Is this the best thread to keep keep an eye out for a fix?

Got a video (slowly) uploading to YouTube about what I’m getting where the DV only triggers once in 3 attempts.

[Orange_GT3]

@jerryfudd

Is this the best thread to keep keep an eye out for a fix?

I would assume so, although the client has moved out of beta for now into the release channel (as you have discovered) so unless there is a new beta I don’t know whether Plex staff will continue to monitor this thread.

[jerryfudd]

Thats what made me think there might have been another thread, being out of beta but couldn’t seem to locate it.

[Grem]

I have no issues with DV triggering.
Sony XF90 - Denon AVR - Shield TV Pro
Re-analyze library on server side, it could help.

[jakeycrx]

@Grem

I have no issues with DV triggering.
Sony XF90 - Denon AVR - Shield TV Pro
Re-analyze library on server side, it could help.

It’s a known problem that has been acknowdged by the Plex team, the Plex developer has commented on this thread about it. Re-analyzing will not make any difference.

@sixones

To give an update on this, it appears to be an issue with the Dolby Vision decoder it appears to randomly crash when we configure it, this causes us to fallback to transcoding. Currently the only workaround for this is to back out and replay until Dolby Vision plays and the decoder doesn’t crash.

This appears to only happen with certain profiles and videos, whilst others will always playback successfully.

[jerryfudd]

I’ve got Days of Thunder, will need to re-pull it off the disc with DV but will give it a test.

[Orange_GT3]

Thank you @jerryfudd.

[sixones]

@Decidueye

EDIT: It seems it’s as sjpotter said. It’s the Shield’s. I tested Our Planet on Netflix with my TV and the Shield, and I can see the same issues aforementioned. TV playback is brighter and better than the Shield’s. Could it be that my Shield is faulty?

I believe this is a bug in the Dolby Vision decoder that is on the SHIELD.

@ApexAftermath

So do we know what exactly is the deal with why DV finally works if you just keep stopping and starting the movie again? Some movies are more stubborn than others, but I assume this is a solvable issue in the Plex software otherwise why would it work at all?

@fizban11

As far as I know, there has been no new beta update for attempting a fix, yet DV support was added to the latest general release.

From our investigations into this it appears to be a bug in the Dolby Vision decoder, we are still actively looking into it and are investigating with NVIDIA. When Dolby Vision isn’t triggered the Dolby Vision decoder has crashed, when this happens we fallback to direct streaming which only supports HDR10.

[djjaeger82]

@sixones

From our investigations into this it appears to be a bug in the Dolby Vision decoder, we are still actively looking into it and are investigating with NVIDIA.

Call me skeptical… But I heard the same thing before about 4k uhd high bitrate mkvs crashing on the non-pro 2019 shield (tube). There still was never a fix to that, and resulted in many of us having to buy another piece of hardware (the pro). I’ve never had dolby vision issues on other sources like Netflix using my 2019 Nvidia shield pro, so forgive me for raising an eyebrow when you say you think it’s a problem with Nvidias dolby vision decoder. Just hoping to avoid the whole plex blames nVidia and nVidia blames plex debacle again.

Can you elaborate more on why you believe this to be the case?

[sixones]

@djjaeger82

Call me skeptical… But I heard the same thing before about 4k uhd high bitrate mkvs crashing on the non-pro 2019 shield (tube). There still was never a fix to that, and resulted in many of us having to buy another piece of hardware (the pro).

The high bitrate 4K videos crashing on the Tube have been diagnosed as performance issues with our application (memory usage etc…), we have been constantly improving the app’s performance with each release to make it more reliable to play high bitrate files on lower end devices (the tube included), for me on the Tube I can now play 4K files with TrueHD and Dolby Vision without any issues.

@djjaeger82

I’ve never had dolby vision issues on other sources like Netflix using my 2019 Nvidia shield pro, so forgive me for raising an eyebrow when you say you think it’s a problem with Nvidias dolby vision decoder. Just hoping to avoid the whole plex blames nVidia and nVidia blames plex debacle again.

It’s definitely not a blame game, it’s more of a we can’t figure out why the decoder is crashing sometimes and not others, when we send it the exact same information on each run, sometimes it leads to a crash in searching for the NAL prefix in the video stream. As it’s happening inside of a native library that is part of the operating system on the SHIELD we can’t see the source code to understand why it would sometimes crash and sometimes won’t.

This is only an issue with Dolby Vision of certain profiles and in certain videos, as Netflix control’s all their content they will be using the same format without a huge variety (they for instance won’t support Dolby Vision in MKV’s as they don’t need that etc…).

[truthfulie]

I wonder the red push color issue is also a DV decoder issue on Shield.

[Grem]

Sure it is. Same video stream plays fine on other devices like UBP-X700, FireStick4K or UDP-203

[Grem]

@sixones

on the Tube I can now play 4K files with TrueHD and Dolby Vision without any issues.

It would be nice to know bitrate limitations to almost asured issue-free playback.

[trineogmorten_gmail_com]

Just sharing my experiences with DV MKVs on Nvidia Shield Pro (2019), LG CX TV (through Denon AVC-X8500 receiver):

• DV sometimes triggers, sometimes not
• When using subtitles I sometimes get stutter - to the extent that the movie is unwatchable
• Disabling subtitles or changing sound track seems to make it possible to watch the movie most of the time. Obviously very annoying
• I get green tint on a lot of movies

So hoping that this can all be ironed out since using Plex rather than shuffling discs is very much preferred

APK used: “com.plexapp.android_8.8.0.21200-814034177_minAPI23(arm64-v8a)(nodpi)_apkmirror.com”. If there is a newer/better then please enlighten me.

/M

[jerryfudd]

Tried my Days of Thunder, bar the issues already discussed it worked fine with 5.1 TRUEHD.

1st Play - DV flag and black screen
2nd Play - HDR flag + audio and video
3rd Play - Repeat of 2nd
4th Play - DV flag + audio and video

[Orange_GT3]

@trineogmorten_gmail_com

When using subtitles I sometimes get stutter - to the extent that the movie is unwatchable

It sounds like Plex is transcoding the video when you are using subtitles. What subtitle type are you using? What are you using as your Plex server?

[Grem]

I catched this bug in attempt to play sample video filmed in DV on Iphone 12 Pro

[trineogmorten_gmail_com]

@Orange_GT3

It sounds like Plex is transcoding the video when you are using subtitles. What subtitle type are you using? What are you using as your Plex server?

Yeah, that was my thinking as well. And tbh I didn’t check what it was doing when I had the stutter but after disabling subtitles (embedded from the rip - using Makemkv latest version which supports DV) and enabling again it was direct playing. So it looks a bit strange. I’m using a PC for running my Plex server. It has an older i7 CPU so isn’t exactly under dimensioned. On a cabled Gb network also…
But I don’t think it’s network or CPU. Just seems that my experience with Plex is 50/50. Especially when I enable subtitles. LOTR which isn’t 4K or DV always fails. Might have to do with the DTS sound track. Because 2001 is also DTS and that seems to be more problematic than Atmos movies… Anyway, I guess this is the wrong thread for this discussion. Sorry

/M