The first item sent to FirstOnly will be passed on. All other items are ignored.
Displaying the frame rate, just once, from video when it is decoded:
Pipeline( ... DiracDecoder(), FirstOnly(), SimpleDetupler("frame_rate"), ConsoleEchoer(), )
The first data item sent to FirstOnly's "inbox" inbox is immediately sent on out of its "outbox" outbox.
Any subsequent data sent to its "inbox" inbox is discarded.
If a producerFinished or shutdownMicroprocess message is received on the "control" inbox. It is immediately sent on out of the "signal" outbox and the component then immediately terminates.
FirstOnly() -> new FirstOnly component.
Passes on the first item sent to it, and discards everything else.
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-- Automatic documentation generator, 19 Oct 2008 at 14:29:09 UTC/GMT