OpenCV 4.4 VideoCapture Memory Leak with Gstreamer

[kdavis523]

System information (version)

• OpenCV => 4.4.0
• Operating System / Platform => Windows 10
• Compiler => Visual Studio 2017

Detailed description

When using OpenCV with gstreamer support, VideoCapture API appears to have a memory leak.
Observed behavior was a complete program shutdown after a long period of time.
Ran through Visual Studio debugger, and memory heap profiling shows consistent growth.

VideoCapture is initialized with a gstreamer pipeline, reading an encoded video stream over UDP.
Issue exists with H265, H264, UDP multicast, RTP or MPEGTS

Pipeline example:
"udpsrc address=225.1.1.1 port=5555 ! queue ! tsdemux ! h265parse ! video/x-h265, stream-format=byte-stream, alignment=au ! queue ! avdec_h265 ! videoconvert ! queue ! appsink"

Memory issue appears to go away if I switch the backend to using FFMPEG

Steps to reproduce

Issue submission checklist

• I report the issue, it's not a question
• I checked the problem with documentation, FAQ, open issues,
  forum.opencv.org, Stack Overflow, etc and have not found solution
• I updated to latest OpenCV version and the issue is still there
• There is reproducer code and related data files: videos, images, onnx, etc