Thanks to Venn for pointing out his Linux Game Cast project:
I love that people are taking the time to capture Linux games. I just don’t think GTKRecord/Xvidcap is the best solution for game capture.
I have been working with the original Yukon source (OpenGL video capturing framework) and ended up with some surprising/proper results.
If you have a moment take a look at the Doom3 MOD Hexen with everything turned to 11.
I knocked out a few howtos as well (I did this after being accused of capturing under Windows)
As I said, I love that anyone takes the time to capture Linux games. I’m just trying a different approach.