Both dns here are running on top of IoT devices (BeagleBone & Raspberry Pi) the DHCP from the Internet provider's box override its dns for my internal ones.
https://www.reddit.com/r/pihole/comments/9w5swx/i_think_ive_managed_to_block_youtube_ads_with/
TL;DR;
nslookup manifest.googlevideo.com
On the DNS (using dnsmasq here via pi-hole)
vi /etc/hosts
<IP from nslookup> manifest.googlevideo.com
reboot/relaunch dnsmasq