I started to implement the support to record videos natively in Uzem using ffmpeg. Unfortunately I had no time to keep going with the implementation for the next weeks, so I'm posting here a patch with what I have been doing in the case someone wants to give a try.
This is a video of Megatris recorded using Uzem:
[youtube]http://www.youtube.com/watch?v=KZ6VYWxXj8w[/youtube]
As you can see, the current code records just video with no audio support (the audio in the video is from youtube audio library). The implementation is far from be completed and the patch is a bit "dirty". I'm still learning ffmpeg and video formats. To add audio I expect some big changes in the patch.
The Makefile patched is for Linux, but if someone try to get involved using Windows, I hope that setup the ffmpeg dev package should be the minor of the problems

Hope you enjoy the partial work. Contributions are welcome. Actually I'm posting this work because it is stopped here for some time and I though someone would like to get involved.
Cheers,
Filipe Rinaldi