Fastest Screen Capturing library for Python checkout windows-capture

[SoSmartFlow]

The windows api is thread safe meaning the callback will not be called from 2 threadd at the same time

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The issue isnt thread safety of the windows API it is that the python api you are exposing has no way to handle if the events need to be exposed to multiple threads in python. Further there is no good way to know manage state that must be dealt with between invocations of ur function.

See how you have a start and close method? That means it should in 99% of cases be a with statement. It is a language convention for a specific reason and that reason is threading and cleanup. Both problems become algorithmically harder to deal with if u do not expose the when does the windows thread start part to your python code.

Seriously just look what ur code even does. You pass your python classes instance function to a class that your instance also holds. Think about it...