How to record livestream with audio with python?

Question

I want to use python to record a livestream with video and audio. The following code snippet is a complete working example (which might work only in Grmany, or by VPN) which I can use to record a livestream, but the resulting file is only the video without the audio:

import time
import requests
from seleniumwire import webdriver 

def download_stream(url):
    r1 = requests.get(url, stream=True)
    with open('testvid.mp4','ab') as f:
        for chunk in r1.iter_content(chunk_size=1024):
            f.write(chunk)

# Create a new instance of the Chrome driver
driver = webdriver.Chrome()

# Go to the Google home page
driver.get('https://www.zdf.de/live-tv')

# Access requests via the `requests` attribute
tslist = []
while True:
    for request in driver.requests:
        if request.url.endswith(".ts"):
            if request.url not in tslist:
                tslist.append(request.url)
                download_stream(request.url)

What do I have to change to also record the audio of the livestream in sync with the video stream?