Downloading commercials/advertisements from YouTube

Does anyone know how to download ads that appear often before videos to your hard drive?
Answer #1
IDM and Jdownloader 2 let you download youtube videos, so I presume they would download the adds if wanted/needed. I dont have adds enabled to test for you though..
Answer #2
Thanks!
Answer #3
Ads most likely are on a differnt stream as you don’t get them when you download YT videos.