I came accross this blog,
I have a similar issue, but regarding QT.
I followed the instructions in the blog, and i was able to view the display using ADV7180 using gst-launch.
But when i run the "Declarative-Camera" code from the QT library in multimediawidgets, the code executes and GUI appears but the display does not work. the screen goes blank where it should play the video which is input to ADV7180.
Is this a known issue? Is there a solution to it?
thank you for your time,