problem running stereo_gui

[Kriti Mukherjee]

Hello,

I am trying to generate DEMs from KH4 images using AMES Stereo Pipeline. I am using WSL. I am unable to display the images using stereo_gui command. I get the following error:

"qt.qpa.xcb: could not connect to display
qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: eglfs, minimal, minimalegl, offscreen, vnc, webgl, xcb.

Aborted (core dumped)"

I tried installing both precompiled binaries and precompiled ASP with conda and get the same error. 

I will be grateful if you kindly suggest what could be a possible solution.

Thank you and best regards,

Kriti

[Oleg Alexandrov]

This is a tricky one. The gui did find what it needed, the "xcb" plugin, but could not even get itself started. 

Are you able to load any other Linux gui from WSL from the same command line interface? Since you say you fetched ASP with conda, one can try to see if, for example, the "qview" program may start or not. 

Not being able to connect to the display seems to be a more general issue than our gui. I never encountered this before.

I found the following resources, maybe you can try to see if they help.

https://askubuntu.com/questions/1271976/could-not-load-the-qt-platform-plugin-xcb-in-even-though-it-was-found

https://discuss.pixls.us/t/solved-could-not-load-the-qt-platform-plugin-xcb-in-even-though-it-was-found/17677

https://stackoverflow.com/questions/68036484/qt6-qt-qpa-plugin-could-not-load-the-qt-platform-plugin-xcb-in-even-thou

They say one should first use export QT_DEBUG_PLUGINS=1 to get more details on the problem. Then one may need to install some library missing from your system, presumably. 

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[Jordan Brown]

Hello,

I had the same issue running stereo_gui and poked around for a while trying to fix it. First, I tried setting QT_QPA_PLATFORM=offscreen, which made the above-cited error disappear, but led to another one and then the process getting hung after saying "This plugin does not support propagateSizeHints()"...

And then, thinking I was just undoing what I had done, I set the above variable back to "xcb" as follows...

 export QT_QPA_PLATFORM=xcb

... and it seemed to fix the problem! Hope this works for you as well.

All best,

Jordan

[Oleg Alexandrov]

This is interesting. In stereo_gui the env variable QT_PLUGIN_PATH is set to find all plugins, and normally that should be enough. 

This kind of error seems to be quite dependent on what plugins are usable with your GUI set up, and I have now way of reproducing this on my side. ASP ships the relevant Qt plugins (xcb, webgl, etc).

To view this discussion on the web visit https://groups.google.com/d/msgid/ames-stereo-pipeline-support/a5f11970-f68c-4e9d-a51e-7ecd634380e1n%40googlegroups.com.