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error setting shutter with float #548
Description
If I do
camera.shutter_speed = 200 * 1e3
I get the error
Traceback (most recent call last):
File "./capture.py", line 30, in <module>
cap()
File "./capture.py", line 14, in cap
camera.shutter_speed = 200 * 1e3
File "/usr/lib/python3/dist-packages/picamera/camera.py", line 2594, in _set_shutter_speed
self._camera.control.params[mmal.MMAL_PARAMETER_SHUTTER_SPEED] = value
File "/usr/lib/python3/dist-packages/picamera/mmalobj.py", line 1493, in __setitem__
func(self._port, key, conv(value)),
ctypes.ArgumentError: argument 3: <class 'TypeError'>: wrong type
I suggest that either the conversion is automatic (PR to follow) or the error message be made a bit more friendly.
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