See the MediaTools tutorial for an example of doing a screen capture:
http://wiki.xuggle.com/MediaTool_Introduction#How_To_Take_Snapshots_Of_Your_Desktop
Hope that helps,
- Art
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http://www.xuggle.com/
xu‧ggle (zŭ' gl) v. To freely encode, decode, and experience audio and video.
Use Xuggle to get the power of FFMPEG in Java.