Hello,

> This approach doesn't result in the fatal crash, but I do get an "Error:
> DirectShow: True" error.

  This error simply indicates that you were trying to initialize the
subsystem when it is already initialized.  One thing you can do is
call the class side #shutdown method once and it shouldn't raise this
error.

  In regards to the multi-threaded code, you should use the WorldState
class #addDeferredUIMessage: to avoid the race condition.

-- Yoshiki