Obtain URL after javascript execution

There is an HTML+Javascript page.On this page, videos are played with a video tag, but the URL of the video is set to the video tag by running javascript.

I would like to get the URL that will be set in this video tag.
How do I get the video url(mp4) generated by running javascript from the page URL using bash or PHP?

What I want to do is the image below.

$getmovieurl.sh http://aaa.com/aaa.html

It doesn't matter if it's related page information.I would appreciate it if you could let me know if you know.