def open_camera_list(self, inst):
menu = DropDown(auto_width=False, width=200)
try:
from pygrabber.dshow_graph import FilterGraph
device_list = FilterGraph().get_input_devices()
except:
device_list = []
for i, each in enumerate(device_list):
btn = DropItem(text=each, icon="webcam", font_size=15)
btn.camera_indx = i
btn.bind(on_release=lambda btn: self.set_item(menu, btn))
menu.add_widget(btn)
menu.spacing = 0
menu.add_widget(MDSeparator())
menu.open(inst)
