Over the past two days I have been trying to re-render a video clip, usually a simplistic process, but after an update to the sunab repositories, quite the task to complete. After loading the latest 0.9.10 version of Kdenlive everything worked perfectly, until I hit the render button - then my RAM would be consumed and quickly spill onto the swap area degrading system performance, and sometimes requiring that I CTRL-ALT-F5 to login to terminal to kill the kdenlive & MLT processes.
Upon researching the issue today I found that others were having this issue with as much as 16GB of memory. This new issue is the 3rd time that I have had problems with kdenlive updates, every time I see it in my package manager, I shudder a little. Today; however, there is a new hope - un-be-knownst to me and many others there is a "Last Version" repo available. That's right, not bleeding edge, not the archaic ubuntu version either...a nice little hidden gem.
So, I removed the repo in my synaptic, purged kdenlive, mlt, fre0ir and other related installations and added this blissful repository to my system...
deb http://ppa.launchpad.net/sunab/kdenlive-release-old/ubuntu precise main
That's right, and old repository with the 0.9.8 version ready to be installed. After some package wizardry, the correct repository references, I had rolled back to kdenlive 0.9.8 and rendered a file using the normal amounts of CPU & memory.
As an older and non-code based user, I think I will keep the -1 version repo enabled, and unless you like debugging, you may want to as well.