How to get video url ? Like : http://....../xyz.mp4

Question

From this website http://pdisk.net/share-video?videoid=nv2amh000q70

Answer 1

If you have a laptop or desktop, you could use your web browser's developer tools to inspect the network traffic coming from the site.
I uncovered this URL that played for me:
https://a6.o-hentai.com/pool/pub/32/71/29/4696b5b6117ac8cc4d1723b2ee327129/2744198
It isn't a very simple sequence of steps but the browser's developer tools and network tab should help you.