You can record your desktop between resolution switches with VLC...
In VLC you'd need to go:
- Media > Convert / Save > Capture Device
- Choose "Desktop" as a capture mode
- Up the framerate to something reasonable, like 20fps.
- Click "Convert / Save".
- Choose a destination file. (Usually just navigating to documents and typing "foo.mpg" as a name)
- Click "Start"...
You simply click "Stop" to stop the video from recording.
You'll need to change the resolution of the game to something smaller than your screen (Or the same size) or else the video will be cut off when recording though.