Consequence of applying the same filter twice to one scene

What would be the consequence of applying the same filter twice (with the exact same settings) to one scene?
For example, I drop the de-interlace filter twice (assuming the exact same settings on the filter) onto the same scene by accident and don't pick up on it later... would that do anything to the quality of the footage?

In general, applying the same filter twice to a clip has its effect applied twice. However this depends on the kind of effect: with de-interlace you might get a degraded image since the first pass removes a field and substitutes it with a new field built by interpolation, then the 2nd pass removes a field again. If it is the same as before nothing should happen, but if it is the other one you degrade the image again.
With broadcast safe I guess you won't gain quality by adding it twice.
Piero

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