GST_ELEMENT_FLAG_SINK not set

[Christian Sell]

Hello,
 
I have an element derived from GstBaseParse. Now, whenever I perform a seek
operation on the pipeline, the seek fails, and I see a log messate stating
"child <element> is not a sink". Digging into the code that emits the log
message, I see that a flag GST_ELEMENT_FLAG_SINK is queried, which is not set on
the element, although it clearly has a sink pad.
 
My question: who is responsible for setting it? Is this described somewhere?
 
thanks,
Christian
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