Webcam video recording

bruce

Hi, I purchased the UP board a week ago, I am working on a hobby project, I am a novice so I need your guidance.

I want to record a video (using a push button switch for Start/Stop recording) from a webcam connected to one of the USB port. I found this sample code on OpenCV documentation,

import numpy as np
import cv2

cap = cv2.VideoCapture(0)	#webcam defined,
#fourcc = cv2.VideoWritter_fourcc(*'XVID')
fourcc = cv2.cv.CV_FOURCC(*'XVID')
out = cv2.VideoWriter('output.avi',fourcc,30.0,(640,480))

while(True):
	ret, frame = cap.read()
	#gray = cv2.cvtColor(frame,cv2.COLOR_BGR2GRAY)
	out.write(frame)
	cv2.imshow('frame',frame)
	if cv2.waitKey(1) & 0xFF == ord('q'): #
		break

cap.release()
out.release()
cv2.destroyAllWindows()

Now the problem is that the video doesn't stop by itself, every time I have to press CTRL+C to stop the execution.

Can anyone please guide me how to connect a push button switch with UP board and then execute the code to start and stop the video recording.

I also want to perform some other operation as soon as the recording is being stopped.

please guide me.

Dan O'Donovan

You'll find an example here, for detecting button presses, which might help:
https://up-community.org/wiki/MRAA/UPM#Turn_an_LED_on.2Foff_by_detecting_a_button_press_on_a_GPIO