It wasn't until yesterday that I discovered I had been using a deprecated version of kdenlive for quite some time. I was looking for the reverse clip option only to see it was available, but from version 9.6. So I tried to install it using the sunab repository, but I couldn't do it properly. When I try, first I get a warning:

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OpenCV support for frei0r-plugins is disabled for Precise builds due to unresolved problem causing crashes in melt.

And then when I agree, it is supposedly added. But when Itry to update the list, I get the following error:

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Type 'ppa:sunab/kdenlive-release' is not known on line 1 in source list /etc/apt/sources.list.d/additional-repositories.list

I opened the file with gedit and the first line was indeed "ppa:sunab/kdenlive-release", other than that it was blank. Isn't that how it is supposed to be? I am using Mint 16 on a 32bit laptop.

I would recomend giving the "Daily Builds" method a go

http://userbase.kde.org/Kdenlive/Manual ... ily_builds

I deleted the problem line from the additional-repositories.list file, added the repository again and voila! This time it worked.