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interactive charuco application fails...

Hi, i have built the sample app opencv_interactive-calibration.exe and it will run ok on a webcam (although every frame is rejected, I assume the webcam is too low res)

I have a higher resolution video that i am trying to run, but when i run:

opencv_interactive-calibration.exe -v

in a cmd prompt, I get:

Hot keys:
esc - exit application
s - save current data to .xml file
r - delete last frame
u - enable/disable applying undistortion
d - delete all frames
v - switch visualization
Unable to open video source

The mov is in the same folder as the exe. i have tried converting to an avi, and I get the same issue. Can anyone help me out here?