I can reproduce this here. You can workaround it in istanbul by choosing a lower resolution. It is caused by theoraenc beeing slow and ximagesrc beeing a live source.
** Changed in: gst-plugins-good0.10 (Ubuntu)
Importance: Untriaged => Medium
Status: Unconfirmed => Confirmed
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ximagesrc plugin timing off
https://launchpad.net/bugs/50049
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