This forum is dedicated to basic help and support :
Ask here your questions about basic installation and usage of Mageia. For example you may post here all your questions about getting Mageia isos and installing it, configuring your printer, using your word processor etc.
Try to ask your questions in the right sub-forum with as much details as you can gather. the more precise the question will be, the more likely you are to get a useful answer
Well, it doesn't really reflect reality. openshot is quite crashy, look for the forum threads about it, e.g. viewtopic.php?f=8&t=4549 Blender is more about rendering, and can be used as video editor, but that's not it's main use case.
What stays and comes with the Mageia repositories, would be avidemux and kdenlive, as cinelerra is not yet in the repos. Only a package request for it: https://bugs.mageia.org/show_bug.cgi?id=5934