how to change the sink cap after _init()?

[kevin kelly]

hello, there,

I have one question regarding caps of sink pad.

I create a base element, so I can easily create other plug-in based on my own base element.

In this base element, I need to configure out the caps of sink pad based on some information available only after _init() is called.

when is the best time to set the caps for the sink pad in this base element? and which class function should I put my code in?

thanks
kevin