Hi Mel
This video looks ok to me. From your initial reply, it looks like you haven't quite got the frequency dead center yet. It is kind of a pain in the ass until you learn your device characteristics. Which RTL device are you using? Based on your PPM setting, I'd wager a guess and say the cheap $10 device. If you're wanting to stay on the budget side of SDR, then I really recommend the $25 rtl-sdr.com dongles. They are stable devices with little to no drift.
What method did you use to install GNURadio/OP25?
"The missing attribute is "Hardware"; a Core2-Duo will not cut the mustard."
That hardware is good enough, it's what I used for my everyday SDR scanner with OP25.
-Scott