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Not the easiest to tell from the video. But if you are saying that you have a knocking sound that goes away when you remove fuel from the suspected injector it's likely related to said injector.
To help narrow it down, you can move the injector to another cylinder (swap two injectors) and see if the noise follows that injector. If not then the issue is upstream (in the injection pump) or downstream (in the cylinder) and you can investigate further.
But for now the odds are good you just need the injectors serviced.
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