I've set the maximum buffer for appsink, but memory consumption keeps growing

gst-launch-1.0 rtspsrc location=“rtsp://admin:hik12345@” ! rtph264depay ! h264parse ! omxh264dec ! nvvidconv ! omxh264enc ! appsink max-buffers=10000 drop=true -e

I used this command,I’ve set the maximum buffer for appsink and drop=true,but memory consumption keeps growing,Is there a problem here?

On gstreamer 1.8.3, it looks to have some issue in using appsink in gst-launch-1.0. Please run it in an application.

Two samples for your reference: