Huge memory leak (unreleased video resources)

[JessyJP]

As the title suggests. Background and other videos are not being properly handled by the Gstream interface (i guess).
Posted about this on the forum : https://quelea.discourse.group/t/ridiculous-ram-usage-problem/1165/3

[mrpenguinb]

With Gstreamer 1.26.5 (tested a known stable version as stated in other issues on this repo), the memory leak doesn't seem to happen. This is just me briefly testing without a second monitor.