problem with ubuntu 20 and qt 5.15

aligtr

hi everybody

I ran into a problem and I don't know how to solve it. I installed qt 5.15 on my itx-3568jq from the official Google drive. I am using ubuntu 20 also from the official disk. I take any project from the examples in which there is a video output. But instead of a video, I only have a red screen. On ubuntu 18 and qt 5.12 everything worked as it should.
In addition, maybe someone has encountered a problem in qt with the output of several videos using gstreamer. I know that I need to use qt5videosink (from the official ubuntu repository), however, it is not compatible with qt from firefly's google drive.
I hope for your help.
Thanks

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