@AROH 1.16.1 is pretty old and has more memory leaks if vaapi for intel card is applied.
I am using gstreamer 1.22.5 + Qt 5.15.2 in Ubuntu 22.04.
However, your problem may be related to missing lib or plugins. Set GST_DEBUG level to see what is wrong.
https://gstreamer.freedesktop.org/documentation/tutorials/basic/debugging-tools.html?gi-language=c
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