scraping video src fail

[snippsat]

what if the HTML page has double html like this, I went to get but it is empty

Adding /source will break the XPath.
There is tag that makes this task different,which is iframe.
Also a common mistake is not given page time to load,i use time.sleep as first test,there is Waits that deal with this.

So to test code give,on real page may need to switch window browser.switch_to.frame(iframe).
I get source text from iframe,then can parse that text(is now just text not html) with BS to get tag wanted.

from selenium import webdriver
from selenium.webdriver.chrome.options import Options
from time import sleep
from bs4 import BeautifulSoup

#--| Setup
options = Options()
#options.add_argument("--headless")
browser = webdriver.Chrome(executable_path=r'C:\cmder\bin\chromedriver.exe', options=options)
#--| Parse or automation
browser.get('file:///E:/div_code/scrape/local4.html')
sleep(3)
video_tag = browser.find_elements_by_xpath('//*[@id="allmyplayer"]')
print(video_tag)
# Send text html to BS for parse
soup = BeautifulSoup(video_tag[0].text, 'lxml')
print(soup.find('source').get('src', 'Not Found'))

Output:
[<selenium.webdriver.remote.webelement.WebElement (session="d0f2629448eb9fb9baabc6dc77342fb9", element="7cc91c06-2934-4243-9645-a334805ce2c4")>]
https://vs02.520call.me/files/mp4/1/13cDq.m3u8?t=1625961526