How does "record" activity the camera in Sugar?

[Erik Blankinship]

The first command will run the camera data directly to the xv image sink via
gstreamer (a video application framework used by the Record activity).  We
can diagnose where the problem is better when we see the result of this
test.

The second command will run a test pattern directly to the xv image sink.
If we get the same visual problem with the test patter, we might be able to
rule out the camera as the culprit.
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