From the looks of your video the CO2 is coming out of solution straight out of the keg. This tells me that you most likely do not have the gas in pressure high enough to keep it in solution, or possibly that the keg was shook the heck up. As JuanMoore said in another thread
"...12 psi you're using for the commercial kegs is likely lower than the equilibrium level. Most commercial beer is carbed to 2.7 vol, which at your serving temp would require 14-15 psi serving pressure. If you serve the beer at a lower pressure, CO2 will sometimes come out of solution in the lines forming pockets of gas as the keg sits, and the first pour of each drinking session will come out faster and full of foam."
I would suggest you start at normal pressures of 10-12 psi as it was set and slowly increasing the pressure until you hit the point where the foam in the lines goes away. the correct link to your video is
for those who are interested in seeing it.