Retrieving stream key for pipeline with RTMP SourceBin

Hello there,

I've made it so far as to have a pipeline that has an RTMP SourceBin with a validator to ensure the I have a correctly formatted stream key, but I would like to be able to retrieve/inspect the key affiliated with a given pipeline after calling start_link.

The concrete use case is that I would like to be able to match a pipeline & stream key, to be able to use these in tandem in other areas of my application.

Would you have any pointers on how to go by accomplishing this?

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