< Kdenlive‎ | Development
Revision as of 21:18, 28 December 2015 by Vpinon (talk | contribs) (new KF5 modules required/recommended)

Working with Kdenlive on KF5

If you want to test the KF5 (KDE Frameworks 5, based on Qt5) version of Kdenlive, you need a distribution that provides a running KF5 environnment, like Kubuntu Vivid (15.04) preview releases.
The status of the refactoring development process can be found on Refactoring page

Compiling MLT with Qt5 support

The first step is to recompile MLT with Qt5 support.

First install dependencies, on ubuntu:

sudo apt-get install build-essential pkg-config \
 libavformat-dev libavdevice-dev frei0r-plugins-dev libgtk2.0-dev libexif-dev \
 libmovit-dev libsdl1.2-dev libsox-dev libxml2-dev \
 ladspa-sdk libcairo2-dev libswscale-dev qtscript5-dev libqt5svg5-dev \ 
 libqt5opengl5-dev libepoxy-dev libeigen3-dev libfftw3-dev kdelibs5-plugins

On OpenSuse 13.2, for MLT+Kdenlive (not very used to that system, please correct me):

zypper ar -f http://download.opensuse.org/repositories/KDE:/Qt5/openSUSE_13.2 Qt5
zypper ar -f http://download.opensuse.org/distribution/13.2/repo/oss/ oss
zypper ar -f http://download.opensuse.org/source/distribution/13.2/repo/oss/ oss-src
zypper refresh
zypper si kdenlive libmlt
zypper install libqt5-qtscript-devel libqt5-qtsvg-devel \
 libQt5OpenGL-devel libQt5Concurrent-devel kplotting-devel \
 libQt5Test-devel kparts-devel knotifications-devel

Now obtain the source files for the melt project.

Get the latest release from https://github.com/mltframework/mlt/releases/latest. This shows the most recent release notes. Now scroll down to the end of the release note. You should see a minor section labelled "Downloads". This section contains two attachments; one for the zip sources, another for the tar.gz sources. Download one of them and unpack to some nice place in your file system. In this example the source was downloaded to ~/kdenlive/ creating a folder mlt-0.9.8

This page also has links to Melt releases http://www.mltframework.org/bin/view/MLT/ProjectNews

Decide where on the file system you want the compiled files to be installed. I choose /home/ttguy/development/kdenlive

Create shell variable for your choice by entering the following in the terminal


eg INSTALL_PREFIX=/home/ttguy/development/kdenlive

change directories to the melt source folder eg cd ~/kdenlive/mlt-0.9.8

Then configure, enabling all components, using target install dir specified by our INSTALL_PREFIX shell var, and pointing to Qt5...

On ubuntu 15.04 (multiarch enabled):

./configure --enable-gpl --enable-gpl3 --prefix=$INSTALL_PREFIX \
 --qt-includedir=/usr/include/x86_64-linux-gnu/qt5 --qt-libdir=/usr/lib/x86_64-linux-gnu

While on ubuntu 14.10 or OpenSuse 13.2:

./configure --enable-gpl --enable-gpl3 --prefix=$INSTALL_PREFIX \
 --qt-includedir=/usr/include/qt5 --qt-libdir=/usr/lib64

Success will look something like:

$ ./configure --enable-gpl --enable-gpl3 --prefix=$INSTALL_PREFIX \
  --qt-includedir=/usr/include/x86_64-linux-gnu/qt5 --qt-libdir=/usr/lib/x86_64-linux-gnu
Configuring framework:
Configuring modules:
Configuring modules/avformat:
Configuring modules/core:
Configuring modules/decklink:
Configuring modules/feeds:
Configuring modules/frei0r:
Configuring modules/gtk2:
- Libexif found, enabling auto rotate
Configuring modules/jackrack:
Configuring modules/kdenlive:
Configuring modules/linsys:
Configuring modules/lumas:
Configuring modules/motion_est:
Configuring modules/normalize:
Configuring modules/oldfilm:
Configuring modules/opengl:
Configuring modules/plus:
Configuring modules/plusgpl:
Configuring modules/qt:
- Libexif found, enabling auto rotate
- Qt version 5.x detected
- Include directory:  /usr/include/x86_64-linux-gnu/qt5
- fftw found, enabling lightshow
Configuring modules/resample:
Configuring modules/rtaudio:
Configuring modules/sdl:
Configuring modules/sox:
Configuring modules/swfdec:
- swfdec not found: disabling
Configuring modules/vid.stab:
- vid.stab not found: disabling
Configuring modules/videostab:
Configuring modules/vmfx:
Configuring modules/xine:
Configuring modules/xml:
Configuring mlt++:
Configuring swig:
GPLv3 license used

In the same melt source folder type:


success looks something like:

make[1]: Leaving directory '/home/ttguy/kdenlive/mlt-0.9.8/src/swig'
make[1]: Entering directory '/home/ttguy/kdenlive/mlt-0.9.8/profiles'
make[1]: Nothing to be done for 'all'.
make[1]: Leaving directory '/home/ttguy/kdenlive/mlt-0.9.8/profiles'

In the same melt source folder type:

make install

success looks something like:

install -d "/home/ttguy/development/kdenlive2/bin"
install -d "/home/ttguy/development/kdenlive2/include"
install -d "/home/ttguy/development/kdenlive2/share/mlt/profiles"
install -m 644 * "/home/ttguy/development/kdenlive2/share/mlt/profiles"
rm -f "/home/ttguy/development/kdenlive2/share/mlt/profiles/"*~
rm -f "/home/ttguy/development/kdenlive2/share/mlt/profiles/Makefile"
make[1]: Leaving directory '/home/ttguy/kdenlive/mlt-0.9.8/profiles'
cp -R presets "/home/ttguy/development/kdenlive2/share/mlt"

Check that your compiled melt works:


melt myclip.mp4

Melt should play your test file in a video window.

You can check that your melt is linked to QT5 /KF5 libraries using the ldd command

ldd $INSTALL_PREFIX/lib/mlt/libmltqt.so

        linux-vdso.so.1 =>  (0x00007ffcc0d4d000)
        libmlt.so.6 => /usr/lib/libmlt.so.6 (0x00007f797c7f4000)
        libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f797c5d6000)
        libX11.so.6 => /usr/lib/x86_64-linux-gnu/libX11.so.6 (0x00007f797c29d000)
        libQt5Core.so.5 => /usr/lib/x86_64-linux-gnu/libQt5Core.so.5 (0x00007f797bd5a000)
        libQt5Gui.so.5 => /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5 (0x00007f797b80d000)
        libQt5Xml.so.5 => /usr/lib/x86_64-linux-gnu/libQt5Xml.so.5 (0x00007f797ce05000)
        libQt5Svg.so.5 => /usr/lib/x86_64-linux-gnu/libQt5Svg.so.5 (0x00007f797cdad000)

As Dan Dennedy recently pointed out, the frei0r package, which contains many effects, sometimes causes crashes because 2 of its filters are usually compiled against Qt4, which conflicts with Qt5. The solution is to balcklist these 2 filters, by adding them in MLT's blacklist.txt file, found in:


Just add these lines to the file:


Get the Qt5/KF5 branch of Kdenlive

We are cloning the git repository for kdenlive into a local folder on your hard drive. This step will create a new kdenlive folder in the current directory. In this example I cloned into ~/kdenlive/kdenlive_git. Which creates ~/kdenlive/kdenlive_git/kdenlive

cd ~kdenlive
mkdir kdenlive_git
cd kdenlive_git
git clone git://anongit.kde.org/kdenlive.git

Success looks like:

Cloning into 'kdenlive'...
remote: Counting objects: 67026, done.
remote: Compressing objects: 100% (12978/12978), done.
remote: Total 67026 (delta 54842), reused 65893 (delta 53935)
Receiving objects: 100% (67026/67026), 22.35 MiB | 582.00 KiB/s, done.
Resolving deltas: 100% (54842/54842), done.
Checking connectivity... done.

The master branch is the current development branch containing refactoring efforts.

Create a build directory inside the kdenlive directory that git created:

cd kdenlive;mkdir build;cd build

(working dir now /kdenlive/kdenlive_git/kdenlive/build in our eg )

Compile Kdenlive

(These instructions do not include a build of the vidstab package and thus your built kdenlive will be missing the stabilization feature)

You will need to install several Qt/KDE devel packages to successfully compile.

On Ubuntu 15.04 the following packages will pull all the necessary dependencies:

sudo apt-get install \
 libkf5newstuff-dev libkf5notifications-dev libkf5notifyconfig-dev libkf5plotting-dev \
 libkf5crash-dev libkf5filemetadata-dev \
 extra-cmake-modules  kdoctools-dev \
 libsm-dev libv4l-dev libav-tools cmake qtdeclarative5-dev kde-runtime kinit  kio

Then build Kdenlive with the following options (in your build dir) - (note the use of the INSTALL_PREFIX shell variable we created earlier in our melt build):




success for the above step looks like

-- The C compiler identification is GNU 4.9.2
-- The CXX compiler identification is GNU 4.9.2
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- The following RUNTIME packages have been found:

 * LibV4L2 , Collection of video4linux support libraries , <http://freecode.com/projects/libv4l>
   Required for better webcam support
   Required for better webcam support

-- The following OPTIONAL packages have been found:

 * PkgConfig
 * Qt5Concurrent
 * Qt5Qml
 * Qt5Quick

-- The following REQUIRED packages have been found:

 * ECM (required version >= 1.2.0)
 * Qt5Core
 * Qt5DBus
 * SharedMimeInfo , A database of common MIME types , <http://freedesktop.org/wiki/Software/shared-mime-info/>
 * OpenGL , the OpenGL library

-- Configuring done
-- Generating done
-- Build files have been written to: /home/ttguy/kdenlive/kdenlive_git/kdenlive/build

make -j4 install [1]

Success for the make step looks like:

Generating ui_scenecutdialog_ui.h
Scanning dependencies of target kdenlive
[ 35%] [ 35%] [ 36%] [ 36%] Building CXX object src/CMakeFiles/kdenlive.dir/kdenlivesettings.cpp.o
Building CXX object src/CMakeFiles/kdenlive.dir/doc/doccommands.cpp.o                                                                                                                           
Building CXX object src/CMakeFiles/kdenlive.dir/doc/documentchecker.cpp.o                                                                                                                       
Building CXX object src/CMakeFiles/kdenlive.dir/doc/documentvalidator.cpp.o     
Linking CXX executable kdenlive
[100%] Built target kdenlive
Install the project...
-- Install configuration: ""
-- Installing: /home/ttguy/development/kdenlive2/share/kdenlive/banner.png
-- Installing: /home/ttguy/development/kdenlive2/share/doc/HTML/en/kdenlive/Kdenlive_Quickstart-Save-Project.png
-- Installing: /home/ttguy/development/kdenlive2/share/doc/HTML/en/kdenlive/Kdenlive-Quickstart-Add-Transition.png
-- Installing: /home/ttguy/development/kdenlive2/bin/kdenlive_render
-- Set runtime path of "/home/ttguy/development/kdenlive2/bin/kdenlive_render" to "/home/ttguy/development/kdenlive2/lib/x86_64-linux-gnu"
-- Installing: /home/ttguy/development/kdenlive2/share/config.kcfg/kdenlivesettings.kcfg
-- Installing: /home/ttguy/development/kdenlive2/bin/kdenlive
-- Set runtime path of "/home/ttguy/development/kdenlive2/bin/kdenlive" to "/home/ttguy/development/kdenlive2/lib/x86_64-linux-gnu:/home/ttguy/development/kdenlive2/lib"
-- Installing: /home/ttguy/development/kdenlive2/lib/x86_64-linux-gnu/plugins/mltpreview.so
-- Set runtime path of "/home/ttguy/development/kdenlive2/lib/x86_64-linux-gnu/plugins/mltpreview.so" to "/home/ttguy/development/kdenlive2/lib/x86_64-linux-gnu:/home/ttguy/development/kdenlive2/lib"
-- Installing: /home/ttguy/development/kdenlive2/share/kservices5/mltpreview.desktop

Execute the Built Kdenlive

Test the built kdenlive by executing the kdenlive binary in the bin folder in your install path (again making use of the INSTALL_PREFIX shell variable we defined during the melt build)


The above command should start kdenlive. However, It is important to have especially the environment variable XDG_DATA_DIRS correctly set to point to the share dir inside the Kdenlive installation directories. The given standard paths for XDG_DATA_DIRS are typically /usr/share as well as /usr/local/share. So if you install Kdenlive to some other place, such as within your own home directory, make sure to add the path to your home-based share dir to XDG_DATA_DIRS before attempting to start Kdenlive. Failing to do so causes Kdenlive to crash in unexpected situations, such as when trying to select a transition in the timeline.

Here's a nifty little script that sets up the environment variables automatically, then fires up Kdenlive; place this script next to your kdenlive executable (ie in $INSTALL_PREFIX/bin/). And don't forget to make it executable (chmod u+x kdenlive.sh).

SCRIPT_NAME=$(readlink -f "$0")
export INSTALL_PREFIX=$(dirname "$SCRIPT_PATH")
echo "Environment set up for $INSTALL_PREFIX"

If you want to be sure that you are executing the kdenlive you just built you might want to increase the version number of the build. This can be done by editing src/kdenlive/CMakeLists.txt

Older Linux Distributions

Frameworks 5 packages are hard come by in slightly old linux versions. Versions of Ubuntu/Kubuntu 15.04 are a safe bet for getting these packages. Consider installing a virtual Ubuntu/Kubuntu 15.04 for testing the frameworks branch.

A light virtualization option is using chroot, setting it up in a ubuntu/debian environment is as simple as:

sudo -s
apt-get install schroot debootstrap
debootstrap --arch amd64 vivid $CHROOTDIR http://us.archive.ubuntu.com/ubuntu/
cat << === >> /etc/schroot/chroot.d/vivid.conf
schroot -c vivid -p

after running the above you will get a prompt like

(vivid)[email protected]:

You can then follow the install instructions above for melt and kdenlive. Note that many of the required packages are in the "Universe" repository - which is not enabled by default on the chroot setup. So you will need to add that repository to the package manager (edit your chroots /etc/apt/sources.list ) in order to be able to find the required packages. Don't forget the apt-get update afterwards.

If, when you test melt, it complains

./melt: error while loading shared libraries: libmlt.so.6: cannot open shared object file: No such file or directory

Then try setting shell variables LD_LIBRARY_PATH and XDG_DATA_DIRS


Installing a recent git version of FFmpeg for Kdenlive (optional)

The LibAV/FFmpeg libraries that do all the encoding/decoding stuff are evolving quickly, but distributions do not always provide a recent version of these libraries. If you want to benefit from the latest features / fixes from these libraries, here is a quick howto on installing a recent FFmpeg version for MLT/Kdenlive without touching your system's LibAV/FFmpeg official version. This howto provides details for FFmpeg, but can probably be easily adapted for LibAV if you have a preference.

  • Get required libraries:
 sudo apt-get install libfaac-dev libgsm1-dev libmp3lame-dev libopencore-amrnb-dev libopencore-amrwb-dev 
libschroedinger-dev libtheora-dev libvorbis-dev libvpx-dev libx264-dev libx265-dev libxvidcore-dev libdc1394-22-dev
  • Get the latest FFmpeg sources:
git clone git://source.ffmpeg.org/ffmpeg.git ffmpeg
  • configure the FFmpeg build with the "suffix" option. It means all FFmpeg programs/libraries will be renamed to use that suffix so that they do not mess up your system's official versions (in my exemple, the suffix is mlt, so ffplay will be called ffplaymlt). Choose the install prefix of your choice, but do not install in /usr. Here is a sample configure:
./configure --prefix=/usr/local --progs-suffix=mlt --build-suffix=mlt --enable-shared --enable-libmp3lame \
--enable-gpl --enable-libfaac --enable-libvorbis --enable-pthreads --enable-libfaac --enable-libxvid \
--enable-x11grab --enable-libgsm --enable-libx264 --enable-libtheora --enable-libdc1394 --enable-nonfree \
--disable-stripping --enable-avfilter --enable-libschroedinger --enable-libopencore-amrnb \
--enable-libopencore-amrwb --enable-version3 --enable-libvpx
  • compile the ffmpeg build

make -j4 [2]

  • Install the build ffmpeg

make install

  • Next, recompile MLT to use this special FFmpeg version. Just add these 2 parameters to the MLT configure, where avformat-shared points to the install prefix of your custom FFmpeg, and avformat-suffix is the suffix used in previous step:
--avformat-shared=/usr/local --avformat-suffix=mlt
  • Recompile Kdenlive.
  • After running the newly compiled Kdenlive ensure that, in the settings dialog under environment, the FFmpeg and FFplay paths point to your newly compiled versions (in my example it will be /usr/local/ffmpegmlt and /usr/local/ffplaymlt)

A build script

File:Build-kdenlive v26b.sh.zip

This is a script to build kdenlive and dependencies in a sandbox. Downloads sources from repositories and does the build. Based on Dan Dennedy version 26 of the build-kdenlive.sh script

http://www.mltframework.org/twiki/bin/view/MLT/BuildScripts#Kdenlive http://github.com/mltframework/mlt-scripts/raw/master/build/build-kdenlive.sh This version differs from the Dan Dennedy script in that it builds the KF5 version of the application Works with ver 15.NN and higher versions of kdenlive[3]

  • Create a folder where you would like kdenlive installed. Eg ~/development/kdenlive
  • Extract the build-kdenlive_v26b.sh to a folder anywhere.
  • Make build-kdenlive_v26b.sh executable
  • Edit build-kdenlive_v26b.sh and set the INSTALL_DIR var
eg INSTALL_DIR="$HOME/development/kdenlive"

Look in the comments at the start to see the list of dependencies you should install before hand. Install them using the sudo apt-get install ... commands shown.

in a terminal execute ./build-kdenlive_v26b.sh

When the job finishes cd to the INSTALL_DIR choosen above and then into the folder named for today's date [4]


cd /home/ttguy/development/kdenlive/20151007/

execute this to start the application



  1. The -j4 parameter - this controls the number of parallel compilation jobs. -j4 is fine for a Core i3/i5, while it bores a Core i7 to death. On a Core i7 thus better use -j8 as it speeds up compilation a lot and makes use of all available real cores...
  2. The -j4 parameter - this controls the number of parallel compilation jobs. -j4 is fine for a Core i3/i5, while it bores a Core i7 to death. On a Core i7 thus better use -j8 as it speeds up compilation a lot and makes use of all available real cores...
  3. If you want to build a specific version of kdenlive then you can edit the build script to set KDENLIVE_HEAD=0 (instead of 1) and supply the version in the KDENLIVE_REVISION var. eg
    To see what remote branches you could specify for kdenlive
    cd $INSTALL_DIR/src/kdenlive
    git branch -r
    choose a branch from the list and prefix its name with remotes/ when you include it as the KDENLIVE_REVISION option
  4. You can turn off the feature of the script that builds to a folder named for today's date by setting AUTO_APPEND_DATE=0 in the script

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