Julia cannot do GC automatically on OpenCV Mat

[liupgd]

Hi, I used OpenCV.jl to read a video frames. And I found that julia is not able to do GC on data read by OpenCV. There need a mandatory GC.gc() to release those memories, otherwise, there will be a memory leakage.
Is this because that julia 'does not know the cpp memory and julia only saves the pointer of these mats' ? Or is there any bug that julia didn't release OpenCV's memory when julia doing GC?

julia version: 1.6.3
system: windows 10
My code:

vcap = cv.VideoCapture(yourVideoFile)
totalframes = cv.get(vcap, cv.CAP_PROP_FRAME_COUNT)
for i in 1:totalframes
    ret, frame = cv.read(vcap)
end

Run the code, and watch the memory consumption in task manager. The memory increased immediately and never decline.

Thx.

[rakeshksr]

Related issue opencv/opencv_contrib#2766.