How can I render 2 output files, a Left and a Right for S3D

I am using Field Stereo under the Image Processing window and I have enabled Stereoscopic rendering for the Camera properties.
I have tried many other things such as apply anaglph filter but the AVI output file that LW renders is just a jittery video.

Seems like this is advertizied as a great feature of LW and there is no good documentation or tutorials on how to do this.

I am using LW10

Please help
Thanks
ravi