Today I stumble upon a bug in the Kdenlive 0.7.8 running on my Kubuntu 10.10: the crop filter was messing with the display ratio of my video clips. Digging the web I found a bug report that was really close to my problem. According to the comments, this issue was fixed in the upcoming version of MLT. Is that bug the one I encountered ? The only way to find out was to install the development version of MLT. Here is how I did it...
$ sudo apt-get update && sudo apt-get install kdenlive
The idea is to keep the version of Kdenlive installed above, and replace the pre-packaged MLT on our system with a custom development version of our choice.
But first, we'll install all the libraries required to build MLT from sources:
$ sudo apt-get install libavdevice-dev libswscale-dev libvorbis-dev libsox-dev libsamplerate-dev frei0r-plugins-dev libdv-dev libavformat-dev libquicktime-dev libxml2-dev libsdl-dev libsdl-image1.2-dev
Let's now remove the installed MLT. If we use
apt-get or KPackageKit, this will remove Kdenlive. So we'll use the following command to remove MLT while ignoring all the dependencies:
$ sudo dpkg --remove --force-depends libmlt2 libmlt++3 libmlt-data melt
At this point, and every time we try to use it,
apt will complain of broken Kdenlive dependencies, and will try to remove it. This mean we can't upgrade other packages on the system.
To avoid this issue, I tried to freeze the state in which Kdenlive and MLT are, by setting the
hold flag on
melt packages. I tried with both
aptitude, but unfortunately it doesn't work as expected. So we'll continue our hack anyway...
Let's get MLT sources:
$ git clone git://mltframework.org/mlt.git
The command above will give you the latest development version. But if you target a particular revision (like commit 21a3f68 in my case), you have to use this additional command:
$ git checkout 21a3f68
We can now follow the procedure detailed in the Kdenlive manual:
$ cd mlt $ ./configure --prefix=/usr --enable-gpl $ make clean $ make $ sudo make install
That's it ! Now you can launch Kdenlive, and if you run the wizard, you'll see that the MLT version on your system is the latest:
Oh, and by the way, it fixed my problem with the crop filter ! :)
Finally, if you want to revert the mess we created on the system, you have to remove the MLT we built in place:
$ sudo rm -rf /usr/lib/libmlt* $ sudo rm -rf /usr/lib/mlt* $ sudo rm -rf /usr/lib/pkgconfig/mlt* $ sudo rm -rf /usr/include/mlt* $ sudo rm -rf /usr/share/mlt*
I came with the list above by searching my system with the following command:
$ sudo find / -path "/home" -prune -or -iname "*mlt*" -print -or -iname "*melt*" -print
Then, we can let
apt handle Kdenlive and MLT properly and get back to the pre-packaged binaries:
$ sudo apt-get remove kdenlive && sudo apt-get update && sudo apt-get install kdenlive