Possible memory leak

[pnthai88]

I followed #51 and did reinstall Cython

pip uninstall cython
pip cache purge
pip install cython

Here is the 3.9.10 nogil from main branch, memory keep growing. I used gc.collect()

23-10-36.mp4

The same built from original version but with 3.11 official. Memory is very stable

23-07-28.mp4

My program quite simple. It fetch frame from FFMPEG, do some opencv preprocessing like resize, b64encode and send it to another server app.