Hi, the difference in size you are seeing is because of the different video bitrates. The Ntb one has a slightly lower bitrate, so for videos that are about the same duration, this translates to a lighter file.
Whether or not you could perceive the difference amounts to your sensibility and experience with this kind of things as well as to your monitor.
I use Trilium for my TTRPG GM notes, as well as some personal stuff (trip planning, home management, etc).
What I know and use mostly comes from the project's wiki