Get videos recorded on CodeNinja using Selenium

codeninja.py

import time
from selenium import webdriver
from selenium.webdriver.common.keys import Keys
driver = webdriver.Chrome()

usr = ""
pwd = ""

driver.get("http://www.facebook.org")
assert "Facebook" in driver.title
elem = driver.find_element_by_id("email")
elem.send_keys(usr)
elem = driver.find_element_by_id("pass")
elem.send_keys(pwd)
elem.send_keys(Keys.RETURN)

driver.get('http://codingninjas.in/app/classroom/online')
fb_login = driver.find_elements_by_class_name('button_container')
fb_login[1].click()

time.sleep(5)
driver.get('https://codingninjas.in/app/classroom/batch/115/wall')

time.sleep(5)
driver.get('https://codingninjas.in/app/classroom/me/141?batch_id=115')

driver.get('https://codingninjas.in/app/classroom/me/141/content/1911/offering/6565')

while(True) :

	try:
		# play the video
		time.sleep(5)
		driver.find_element_by_xpath('//*[@id="movie_player"]/div/div[27]/div[2]/div[1]/button[2]').click()
	except:
		print("couldn't find play button")

	try:
		# play the video in its full length
		time.sleep(5)
		total_vid_length = driver.find_element_by_xpath('//*[@id="movie_player"]/div/div[27]/div[2]/div[1]/div/span[3]').text
		curr_vid_play = driver.find_element_by_xpath('//*[@id="movie_player"]/div/div[27]/div[2]/div[1]/div/span[1]').text
		#total_time = int(total_vid_length.split(":")[0])*60 + int(total_vid_length.split(":")[1])
		#curr_time = int(curr_vid_play.split(":")[0])*60 + int(curr_vid_play.split(":")[1])
		print("total time : " + total_vid_length)

		while(curr_vid_play != total_vid_length):
			print(curr_vid_play)
			curr_vid_play = driver.find_element_by_xpath('//*[@id="movie_player"]/div/div[27]/div[2]/div[1]/div/span[1]').text

		'''while(curr_time < total_time):
			print(curr_time)
			curr_vid_play = driver.find_element_by_xpath('//*[@id="movie_player"]/div/div[27]/div[2]/div[1]/div/span[1]').text
			curr_time = int(curr_vid_play.split(":")[0])*60 + int(curr_vid_play.split(":")[1])'''

		# playback_time = int(total_vid_length.split(":")[0])*60 + int(total_vid_length.split(":")[1])
		# print("total video play time : " + str(playback_time))
	except Exception as e:
		print(e)
		print("video play error")		

	
	try:
		# press the next button
		time.sleep(30)
		driver.find_element_by_xpath('/html/body/app-root/app-classroom-app/app-selected-content/div/div[2]/app-classroom-right-panel/div/app-content-footer/div/div/app-classroom-button[2]').click()
	except:
		print("next button not found")