import rosbag
import cv2

bag = rosbag.Bag('/home/mika/bags/ros_log.bag', 'r')
print('frame_info')
print(bag.get_message_count('/navion/sensors/frame_info'))
bag.close()

cap = cv2.VideoCapture('/home/mika/bags/video.avi')

counter = 0
while(True):
    ret = cap.grab()

    if ret == False:
        break

    counter+= 1
cap.release()

print('avi')
print(counter)