Memory leak when using Rust binding

[Masoud MJ]

Hi ,
I'm trying to merge multiple videos in grid shape using Rust binding in my
project and when videos count becomes zero
then I will set pipeline state to null when in EOS event
but memory will not be freed and around 10MB for every time video count
reaches zero this will be happen.
I will attach the code and hope you will help .
Thanks in advance !!
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