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I wish to remove a callback function after it runs, if a certain condition is met. However, when I call var_DelCallback from within the callback function, the GUI controls freeze up. How can I accomplish my aim?

Details:

My routine adds a filter to a filter_chain on a given vout thread, but I know of no callback that will fire when a vout thread becomes created, so I'm using an "item-change" callback on the playlist. Each time the "item-change" callback fires, I check the input thread for a vout thread, and if a vout thread is available, I would like to remove the "item-change" callback. As stated before, I can't call remove the callback from within the callback itself, however.

var_DelCallback() waits for any pending invocation of the callback to complete. That is necessary as most var_DelCallback() call paths will promptly deallocate resources used by the callback afterward.