Memory not released gstrtpbin on pad removed

[tanmay.ambre]

i am trying to determine why the memory consumed doesnt return to pre - pad
added level even after unlinking and removing all elements added from
pipline.

udpsrc --> gstrtpbin
Memory :: 2640K

on pad-added signal for gstrtpbin (autoremove=true)

I add and link the following elements to the bin 

[gstrtpbin(srcPad)(existing)]-->sink
(queue)-->rtpspeexdepay-->speexdec-->directsoundsink

The stream starts playing Memory ::3120K - Everything fine

When pad-removed signal is recieved

I unlink ,remove, Set state to NULL and unref for the following elements
-->sink -->rtpspeexdepay-->speexdec-->directsoundsink
The ref count at the end of the function for each element shows 0.

i expect the memory to got back to its previous level of 2640K But instead
it is 2750K.

Am I missing some obvious part i need to do. Or how can I trace this
increased memory size?

I am using OSSBuild.

Cheers

Tanmay Ambre

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