The video didn't capture it well, but the orange is from the thermocouple and ignitor tips glowing orange. The flame itself was actually blue, but sounded weak and unsteady. A couple of times, when it lit, the flame backed up into the burner tube and made the jet-roaring noise that happens when the propane on my bbq is running out.
Eta: also, I didn't touch anything since putting it away in the fall... What could cause it to be getting more fuel or not enough air? I'll pop the tube off and see if there are any spider webs down it, but I would think those would obstruct the gas flow too, not just the air...