Sudden Brightness Changes in Dolby Vision/HDR Content (Z9X + LG C1)

Hey all, yesterday I was watching Marvel’s Avengers and noticed quite noticeable brightness shifts between scenes. For example, when it switches to a brighter scene, the overall brightness seems to “update” with about a one-second delay, and the same happens in reverse when switching to darker scenes — it’s really distracting to be honest.
I tried playing around with various settings, but so far no luck fixing it. What’s interesting is that it’s the first time I’ve seen this in a while — other Dolby Vision titles seem fine at first glance. Has anyone else experienced this kind of issue and found a way to solve it?



Unfortunately, I can't attach a video from a smartphone to this thread.



Setup:

Zidoo Z9X paired with LG C1



Zidoo Display Settings:

• HDR: Auto

• Color Settings / 4K 5060Hz: Priority YUV420 10BIT

• Color Settings / 4K 2330Hz: Priority YUV444 10BIT

• Color Settings / Non-4K: Priority YUV444 10BIT

• HDMI Range: 16–235

• Resolution: Auto

• MaxCLL and MaxFALL: ON

• Deep Colour Compatibility Mode: Open

• DV Compatibility Mode: TV Led

• HDCP: OFF



Playback Settings:

• Frame Rate Mode: Match frame rate only

• Frame Rate Pause: 3 seconds



Any ideas, suggestions, or confirmations from others who’ve seen this would be really appreciated — thanks!

 

What's the source you're playing in this example? Original Blu-ray, remux, or what? The BDInfo or MediaInfo may be helpful to someone (although not necessarily to me).

 

It's remux and I'm playing it from external HDD via USB, screenshot with media info is attached

 

In this case, I can help. The Avengers (2012) is not available on Blu-ray with DolbyVision, only HDR. So someone either took a different source that has DolbyVision (like a streaming source) and tried but failed to accurately integrate it in with the Blu-ray, or they used a program to "create" faux-DolbyVision for the release.

You can sometimes find quality hybrid releases such as that, but it's a 50/50 proposition overall with any hybrid. That's the reason the DolbyVision doesn't look right in that Remux.

 

Did you watch this particular copy before without any problems? As noted above, Hybrid copies or copies from streaming services can deviate from spec.

 

It’s indeed a hybrid release — didn’t even think that could be the reason. Thanks for the clarification!

 

Not this particular copy, so I believe the hybrid nature of this file might be causing the issue.

 

I've always advised people to steer clear of Hybrids. They're just a bit pointless and often badly done.

Streaming companies have their own post production facilities and will re-encode deliverables to fit their own encode ladder. Stitching an RPU from a broadcast release to a physical release is just not a great idea - and as seen here, they often get the timings wrong, or in some cases, they just can't be matched.

I'd rather have the release that the guy with the DaVinci control surface produced rather than the one from the guy who lives in his mom's basement...

Not worth it.

IMHO

 

You're welcome!