Linux Recording
From SDA Knowledge Base
Recording
SimpleScreenRecorder: An easy to use and yet very powerful application to record your games.
Encoding
Yua: Encoding software designed to easily and quickly produce SDA-accepted videos.
FFmpeg: Command line swiss army knife. It does decoding, encoding, streaming, conversions, everything. More flexible than anything else but has a learning curve.
MEncoder: Very similar to FFmpeg.
HandBrake: Powerful encoding software. Less simple than Yua as it requires standard encoding knowledge to use properly.
Avidemux: Same as HandBrake.