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I am using open CV, Python to save same camera Images in jpg and png format.
I am using timestamp to save the images in sequence. My code sample is following. But the problem is it only saves one image every time I execute. What will be the best solution to save the image stream with timestamp

import numpy as np
import cv2
import time

camera = cv2.VideoCapture(0)
time = time.time() #timestamp

def saveJpgImage(frame):
 #process image
 img_name = "opencv_frame_.jpg".format(time)
 cv2.imwrite(img_name, frame)

def savePngImage():
 #process image
 img_name = "opencv_frame_.png".format(time)
 cv2.imwrite(img_name, frame)

def main():
 while True:
 ret, frame = cam.read()
 cv2.imshow("Camera Images", frame)
 if not ret:
 break
 k = cv2.waitKey(1)

 if k%256 == 27:
 # ESC pressed
 print("Escape hit, closing...")
 break
 elif k%256 == 32:
 saveJpgImage(frame)
 savePngImage(frame)


if __name__ == '__main__':
 main()

You're testing when a key is pressed and calling the save function when it's pressed. If you want to call a video loop when the key is pressed please do so! (don't forget to include the escape method!)