./youtube-live-stream-dl.py output.mp4 googlevideo_url1 googlevideo_url2

# download from 1h to 1h03
./youtube-live-stream-dl.py -s 1h -e 1h3m output.mp4 googlevideo_url1 googlevideo_url2

Get url:

On browser: devtools -> network -> copy url (take 2 links on googlevideo.com)