Having an issue with some of my videos being detected as 3D, though they’re definitely 2D, I’ve had two 4K videos do this to me so far, from using the AMB6+ and a Hisense C2 Ultra projector. I’ve looked through settings and can’t find anywhere to completely disable 3D output. While the projector is able to output 3D movies, it’s not something I plan to ever do. The movies themselves are also 2D, so I’m not sure why they’re being detected as 3D.
Any help would be appreciated.
This is a fresh installation of coreelec with the latest nightly update installed. You might spot mention in the logs of a Denon AVR, but this isn’t the cause of the issue as the same problem occurs when connected directly to the projector, the AVR is also set to video passthrough.
If there are any other questions please let me know.
I guess it’s your projector.
CoreELEC do not set any 3D: 3D: false:(0x4), stereo mode: 0
Make a dmesg | paste after play one file shortly.
Also cat /sys/class/amhdmitx/amhdmitx0/support_3d | paste and cat /sys/class/amhdmitx/amhdmitx0/rawedid | paste.
Yeah, I’ve checked projector settings, but nothing obvious there and of course the options available are nothing compared with coreelec. This has only happened so far with two movies that I can recall, both being 4k, I don’t believe 3D 4K video even exists.
I’ll try running the above command tomorrow. It seems like there’s some kind of weird signal being sent to the projector that makes it believe it’s receiving a 3D movie, comes up with some text saying to put on 3D glasses.
I also have from time to time on my Pana Plasma TV some false triggering of 3D mode, while watching 2D video via SAT-receiver (no CE involved at all). This seemed to happen when there was some 2D image with similar doubled content inside, and 3D autodetect was enabled.
To me it looks like the builtin Image-processor continuously monitors the video-input for double-image (SbS, Top-down), not only the frame coding.
Maybe your projector does the same…
I take it there was nothing that stood out in the dmesg output? The idea that it’s due to two video signals is interesting, given there’s a fair amount of hybrid content out there. But I’m not sure that’s the cause. An easy fix is probably for me to turn on some kind of video processing on the AVR rather than use passthrough, but it’s not the ideal solution. I’m pretty sure there was no option in the projectors menus to disable 3D unfortunately.
It is reported the device support 3d, but there are no 3d modes in EDID.
Maybe it will be solved one day.
What would happen if I just set the value of /sys/class/amhdmitx/amhdmitx0/support_3d to 0? 
Would brute forcing it to turn off 3D support work temporarily I wonder?
Just tried echo 0 > /sys/class/amhdmitx/amhdmitx0/support_3d
But get permission denied even though I’m root, bit odd. My previous idea of turning off video passthrough on the AVR didn’t seem to work, but perhaps I need to test a couple more things.
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