This page should guide the developer to a build environment and provide a general “getting started”.
Porting Kdenlive to Qt5/KF5: Kdenlive development is now mostly moving towards the Qt5/KF5 version. You will find information on this page: Kdenlive/Development/KF5
Getting the sources
Pick your favourite!
Setting up KDevelop
- adding kdenlive
- adding mlt (references)
Setting up QtCreator
After checking out Kdenlive from git—when working on refactoring, you may want to clone two copies, one with the next branch and another one on the refactoring branch—, you can open the CMakeLists.txt in QtCreator, which will load the project if cmake succeeds. If you run/debug Kdenlive, make sure that kdenlive and not kdenlive_render is selected as active project.
If you let QtCreator restore the previous session (File > Session manager), it will remember the open documents. Environment variables (see below) can be set in Projects > Build Environment.
Kdenlive uses MLT’s C++ API called mlt++. This API is not documented as it is simply a wrapper to C functions. For example, the documentation of
Mlt::Consumer::position() can be found in
framework/mlt_consumer.c:mlt_consumer_position(). The actual C function name is usually a combination of the class name and the function name, but can also be found by consulting
If kdenlive crashes on startup (e.g. in QtCreator) and shows a message like:
kdenlive(24309) KXMLGUIClient::setXMLFile: cannot find .rc file "kdenliveui.rc" for component "kdenlive"
then you have to ensure the .rc file is found. If CMake is configured to install Kdenlive to /usr/local, the .rc file is put there, but when kdenlive is then run from the build directory, the KXMLGUIClient will not search there. Solution: Set the environment variable KDEDIRS to
You can get more information about the paths that are checked by running kdenlive like this:
strace build/src/kdenlive 2>&1 | grep kdenliveui.rc
Developer Mailing List
The kdenlive developer mailing list archives can be found here
Information on how to subscribe can be found here