i searched a new Video-Editor and found Shotcut very easy and good to use.
I use a MacBook Pro 2014 and OSX 10.10.5. When i exported i took YouTube and then the RAM-Usage of melt went directly up to 1 GB and more and you could see it rising within minutes to 2, 3, 4, 5, 6, 7, 8 GB and then my OSX nearly crashed and halted qmelt by itself. I have never seen OSX do this before and i use Macs since 10.04. This is the case regardless of with or without Hardware acceleration. I could stop the qmelt with Shotcut before it crashed the system again.
However if i chose to export with H.264 High Profile everything runs smooth and melt does not use more than 1 GB.
Seems like a bug. But H.264 solved it. Does anybody else experience this problem?