ROSBAG overriding Extracted Images

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Hello,

I have a rosbag file which contain images. I am extracting images through the following subscriber.

I extract only one image. I thing it is replacing every new image with the old one. I need to save all images.

Can you point me out where should I make changes.

#! /usr/bin/python

import rospy
from sensor_msgs.msg import Image
from cv_bridge import CvBridge, CvBridgeError
import cv2

bridge = CvBridge()

def image_callback(msg):

    print("Received an image!")
    try:

       cv2_img = bridge.imgmsg_to_cv2(msg, "bgr8")

    except CvBridgeError, e:
        print(e)
    else:
            cv2.imwrite('~/rec_images/frame.jpeg', cv2_img)

def main():

    rospy.init_node('img_listener')

    image_topic = "/xxxx/image_raw/raw"

    rospy.Subscriber(image_topic, Image, image_callback)

    rospy.spin()

if __name__ == '__main__':
    main()