I want to use camera app just for preview. Actualy I am using a microscope camera for inspecting small objects. So I do not want it to mirror the object. How can I disable this feature?
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Unfortunately, the Camera app is hardcoded to always flip video. It utilises GStreamer's videoflip filter with a hardcoded value for the flip method.
If you must use the Camera app, you can disable this by cloning the code and compiling from source. You can comment out this line and then compile and install.
An alternative which doesn't use the native Camera app, is to install Cheese and disable the 'Horizontal Flip' effect.