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| Kdenlive is rather easy to build (at least on supported platforms), and this page should show you the simple steps to get there. If you encounter any problem during the process or spot any information that should be added/updated, please don't hesitate to reach out to the [[#Developer_Mailing_List| Developer's mailing list]] or on the [https://t.me/kdenlive_dev Telegram Kdenlive Developers' group] . | | Kdenlive is rather easy to build (at least on supported platforms), and this page should show you the simple steps to get there. If you encounter any problem during the process or spot any information that should be added/updated, please don't hesitate to reach out to the [[#Developer_Mailing_List| Developer's mailing list]] or the [https://webchat.kde.org/#/room/#kdenlive-dev:kde.org Developers' Matrix room]. |
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| == Pre-requisites and Supported Platforms == | | == Building Instructions == |
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| Kdenlive is primarily developed on GNU/Linux. There is an effort to [[Kdenlive/Development/WindowsBuild|build Kdenlive on Microsoft Windows]], but it's still a work in progress.
| | The building instructions have been moved to the [https://invent.kde.org/multimedia/kdenlive/-/blob/master/dev-docs/build.md dev-docs folder in the code tree]. |
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| Currently supported distributions are:
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| * Ubuntu 19.10 Eoan Ermine and derivatives
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| * Arch Linux
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| You Current development code requires '''Qt >= 5.7''', '''KF5 >= 5.50''','''MLT >= 6.18.0'''.
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| To get a recent enough version fo mlt on Ubuntu, you have to add [https://launchpad.net/~kdenlive/+archive/ubuntu/kdenlive-master Kdenlive's ppa]
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| <pre>
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| sudo add-apt-repository ppa:kdenlive/kdenlive-master
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| sudo apt-get update
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| </pre>
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| == Installing dependencies ==
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| It is recommended to uninstall the official kdenlive packages to avoid potential conflicts.
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| <pre>
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| sudo apt remove kdenlive kdenlive-data
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| </pre>
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| === Development tooling ===
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| You will need classical development tools (like git, gcc ...) but also cmake :
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| <pre>
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| sudo apt install build-essential git cmake extra-cmake-modules libsm-dev
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| </pre>
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| === KDE Frameworks 5, based on Qt5 ===
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| On Ubuntu the following packages will pull all the necessary dependencies:
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| <pre>
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| sudo apt install libkf5archive-dev libkf5bookmarks-dev libkf5coreaddons-dev libkf5config-dev \
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| libkf5configwidgets-dev libkf5dbusaddons-dev libkf5kio-dev libkf5widgetsaddons-dev \
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| libkf5notifyconfig-dev libkf5newstuff-dev libkf5xmlgui-dev libkf5declarative-dev \
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| libkf5notifications-dev libkf5guiaddons-dev libkf5textwidgets-dev libkf5purpose-dev \
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| libkf5iconthemes-dev kdoctools-dev libkf5crash-dev libkf5filemetadata-dev kio \
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| kinit qtdeclarative5-dev libqt5svg5-dev qml-module-qtquick-controls \
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| qtmultimedia5-dev qtquickcontrols2-5-dev
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| </pre>
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| === Multimedia stack ===
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| If your distribution packages a recent enough version of MLT (>= 6.10.0), you can install it directly along with ffmpeg and frei0r plug-ins. Otherwise, you'll have to add our ppa or compile it yourself (see above)
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| <pre>
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| sudo apt install libmlt++-dev libmlt-dev melt frei0r-plugins ffmpeg
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| </pre>
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| === Dependencies for localization ===
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| To have kdenlive localised in a different language than EN, you should install the additional dependencies that are required by the specific script to fetch the translations:
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| <pre>
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| sudo apt install ruby subversion gnupg2 gettext
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| </pre>
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| == Getting the source code ==
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| === Cloning the git repo ===
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| The easiest way to get Kdenlive source code is to clone the git repo:
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| <pre>
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| git clone https://invent.kde.org/kde/kdenlive.git
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| </pre>
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| === Selecting the branch ===
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| You should generally base your developments on the master branch
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| <pre>
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| cd kdenlive
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| git checkout master
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| </pre>
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| or if you want to get the code for a given release
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| <pre>
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| cd kdenlive
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| git checkout release/20.04
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| </pre>
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| == Building Kdenlive ==
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| Create a directory for the build inside the kdenlive directory:
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| <pre>
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| mkdir build
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| cd build
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| </pre>
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| To avoid problems with plugins and libraries, it is easier to install Kdenlive in /usr:
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| <pre>
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| cmake .. -DKDE_INSTALL_USE_QT_SYS_PATHS=ON -DCMAKE_INSTALL_PREFIX=/usr -DRELEASE_BUILD=OFF
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| </pre>
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| Alternately you can build it with debug flags (advanced users only ;-) and you need to have clang installed ) :
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| <pre>
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| cmake .. -DKDE_INSTALL_USE_QT_SYS_PATHS=ON \
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| -DCMAKE_INSTALL_PREFIX=/usr -DCMAKE_BUILD_TYPE=Debug \
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| -DCMAKE_CXX_COMPILER=/usr/bin/clang++ \
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| -DECM_ENABLE_SANITIZERS='address' \
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| -DBUILD_TESTING=ON -DBUILD_FUZZING=ON -DBUILD_COVERAGE=OFF \
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| -DRELEASE_BUILD=OFF
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| </pre>
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| To fetch the translations of the application :
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| <pre>
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| make fetch-translations
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| </pre>
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| This should create a po sub-directory in your build directory. You have then to create a symbolic link to this po subdirectory :
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| <pre>
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| cd ..
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| ln -s build/po/ po
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| cd build/
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| </pre>
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| Then build and install:
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| <pre>
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| make -j5
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| sudo make install
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| </pre>
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| You can then start your compiled version by simply entering:
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| kdenlive
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| </pre>
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| If you have compiled it in debug mode, you may encounter errors like
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| <pre>
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| SUMMARY: AddressSanitizer: new-delete-type-mismatch (/usr/bin/kdenlive+0x643020)
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| ==6982==HINT: if you don't care about these errors you may set ASAN_OPTIONS=new_delete_type_mismatch=0
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| ==6982==ABORTING
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| </pre>
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| As the hint says, the you can solve this with
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| <pre>
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| export ASAN_OPTIONS=new_delete_type_mismatch=0
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| </pre>
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| == Next Steps == | | == Next Steps == |
| | Once you've got a working dev environment, you should checkout the [https://invent.kde.org/multimedia/kdenlive/-/blob/master/dev-docs/contributing.md Contributing Guide] and [https://invent.kde.org/multimedia/kdenlive/-/blob/master/dev-docs/coding.md Coding Guide]. |
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| Now that you've got a working dev environment, you can head to [[https://invent.kde.org/kde/kdenlive/-/issues?label_name%5B%5D=Junior+Job some nice first issues to solve]] | | Now you can [https://invent.kde.org/multimedia/kdenlive/-/issues/?sort=created_date&state=opened&label_name%5B%5D=Welcome%20tasks&first_page_size=20 find some nice first issues to solve]. Welcome on board! |
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| You can also get some general info on the TechBase tutorial [https://techbase.kde.org/Development/Tutorials/Building_An_Existing_Application Building An Existing Application]. You may also be interested in the other [https://techbase.kde.org/Development/Tutorials tutorials on TechBase].
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| == IDE Setup ==
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| Pick your favourite!
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| === Setting up KDevelop ===
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| Open KDevelop and go to Project > Open/Import project
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| Then select the CMakeLists.txt file in the kdenlive source folder.
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| You can now start hacking on Kdenlive!
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| === Setting up QtCreator ===
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| 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 an active project.
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| 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.
| | A instruction of the workflow with KDE's GitLab can be found [[Infrastructure/GitLab|here]]. You can also gain more general knowledge by [https://techbase.kde.org/Development/Tutorials exploring the tutorials on TechBase]. |
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| == MLT documentation == | | == MLT documentation == |
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| You can get more information about the paths that are checked by running kdenlive like this: | | 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 | | strace build/src/kdenlive 2>&1 | grep kdenliveui.rc |
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| | == Kdenlives File Format == |
| | A description on Kdenlives file format can be found [https://invent.kde.org/multimedia/kdenlive/-/blob/master/dev-docs/fileformat.md here]. |
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| == Contact == | | == Contact == |
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| === Telegram ===
| | See [[Kdenlive#Contact|Contact]] |
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| * [https://t.me/kdenlive Main group]
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| * [https://t.me/kdenlive_dev Developer group]
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| === Mailing List ===
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| The kdenlive developer mailing list archives can be found [http://mail.kde.org/pipermail/kdenlive/ here]
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| A searchable archive of the kdenlive developer mailing list can be found [ http://www.mail-archive.com/[email protected]/ here] | |
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| Information on how to subscribe can be found [https://mail.kde.org/mailman/listinfo/kdenlive here]
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Kdenlive is rather easy to build (at least on supported platforms), and this page should show you the simple steps to get there. If you encounter any problem during the process or spot any information that should be added/updated, please don't hesitate to reach out to the Developer's mailing list or the Developers' Matrix room.
Building Instructions
The building instructions have been moved to the dev-docs folder in the code tree.
(the rest of this page should follow)
Next Steps
Once you've got a working dev environment, you should checkout the Contributing Guide and Coding Guide.
Now you can find some nice first issues to solve. Welcome on board!
A instruction of the workflow with KDE's GitLab can be found here. You can also gain more general knowledge by exploring the tutorials on TechBase.
MLT documentation
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 mlt++/MltConsumer.cpp:position().
Environment variables
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 $KDEDIRS:/usr/local.
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
Kdenlives File Format
A description on Kdenlives file format can be found here.
Contact
See Contact
