The pipeline expects something in it to trigger a run .. i.e. like a camera capture trigger or a serial input, etc. If there isn't such a module, the pipeline just doesn't run.
The workaround is to set the Min Processing Fps in the Options button->Other Tab->Min Processing FPS to at least 1 ( or some small non-zero value). This will force the pipeline to run at least 1 times a second which will then trigger the variables to update.
Hope this makes sense.
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