Dissolves/Fade to white?

[tago-SE]

Does PySceneDetect have a problem when a image dissolves or fades into white?

I was using the code provided in the python example usage: https://pyscenedetect.readthedocs.io/en/latest/examples/usage-python/

The intro started with a fade-in to white and ended with a fade-out from white. This was never detected and the whole scene was missed. Any advice on how to better detect dissolves?

[wjs018]

Slow dissolves in general are not well suited to being detected using the detect-content method. That method works by looking for abrupt changes in the HSV colorspace above a certain threshold. There have been discussions in the past about how to best detect dissolves and fades before, #62 for example.

You might try using detect-threshold if you know you are always going to looking for fades to/from a pure white and see what your results look like there.

[jihh]

I think ThresholdDetector should add a switch. For blackframe, use if frame_avg < self.threshold:. For whiteframe, use if frame_avg > self.threshold:.

[Breakthrough]

For v0.6.2 you can specify if you want to use either methods with ThresholdDetector, and can also have both by combining two instances of ThresholdDetector each using the other method.