Did some extra debugging in webcam.c initially, I tracked down the
hanging call to be:

if (gst_element_set_state (priv->camerabin, GST_STATE_PLAYING) ==
GST_STATE_CHANGE_FAILURE) {

or more specifically gst_element_set_state(priv->camerabin,
GST_STATE_PLAYING)

I also confirmed that it's a gstreamer issue as I'm unable to reproduce
with "luvcview" but I don't yet know why only a few devices are
affected.

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https://bugs.launchpad.net/bugs/966294

Title:
  Ubiquity loops forever from ubiquity_webcam_play

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