Multiple probe function Deepstream C

I am not quite sure what you mean by that.
You want to have two sink pads for the same element?
I am not sure if that works, @yuweiw can answer this better.

if this is your pipeline:
sinkpadprobe → element → srcpadprobe

and you need two sink pad probes, add a queue or something
sinkpadprobe → element → sinkpadprobe → queue → srcpadprobe.

Although I hope someone provides a much better solution that this.

You cannot manually connect the probe function. The probe function is binding with the plugin.

Okay
Thank You