Cacher is the code snippet organizer for pro developers

Play:
&fmt=18
&fmt=22

Embed:
&ap=%2526fmt%3D18
&ap=%2526fmt%3D22

Start at:
#t=03m22s
&start=30

Disable related
&rel=0

Bypass Youtube Regional Filtering:
youtube.com/v/<somecode>

Disable search:
&showsearch=0

Enable autoplay:
&autoplay=1