I need help fixing flickering/dark screen using cinema pro app on Sony Xperia 5 II?

[Sense12]

I'm using the Sony Xperia 5 II and I'm having problems with the cinema pro app.when I open the app I am always getting flickering and the screen is always dark and I can barely see anything on the screen.when I open the normal camera app and photo pro app my camera is fine.I have tried changing the different settings in cinema pro so that the flickering will stop and so I can actually see what I'm trying to record but I'm still having this problem.I'm wondering if my phone is broken or if there is some setting on cinema pro that is messing me up.if someone could help me I would appreciate it

[CosmicTomato]

If the camera works fine in other apps, it's the app itself that's having issues, try clearing it's cache and data from settings >>> apps and notifications >>> find it and open >>> storage and clear it all.

[Pavel.i]

Indoors, flickering may be due to lamps. If you want to get serious about shooting video, you will have to use another application with a choice of frame rates. For example mcpro24fps