Kdenlive/Development: Difference between revisions

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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].


== Pre-requisites and Supported Platforms ==
== Building Instructions ==


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].


Currently supported distributions are:
(the rest of this page should follow)  
 
* Ubuntu 20.04 LTS Focal Fossa and derivatives
* Arch Linux
 
You should be able to build it on any platform that provides up to date versions of the following dependencies  '''Qt >= 5.7''', '''KF5 >= 5.50''','''MLT >= 6.20.0'''.
 
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]
 
<pre>
sudo add-apt-repository ppa:kdenlive/kdenlive-master
sudo apt update
</pre>
 
It is recommended to uninstall the official kdenlive packages to avoid potential conflicts.
 
<pre>
sudo apt remove kdenlive kdenlive-data
</pre>
 
== Installing dependencies ==
 
 
=== Development tooling ===
 
You will need classical development tools (like git, gcc ...) but also cmake :
<pre>
sudo apt install build-essential git cmake extra-cmake-modules libsm-dev
</pre>
 
=== KDE Frameworks 5, based on Qt5 ===
 
On Ubuntu the following packages will pull all the necessary dependencies:
 
<pre>
sudo apt install libkf5archive-dev libkf5bookmarks-dev libkf5coreaddons-dev libkf5config-dev \
libkf5configwidgets-dev libkf5dbusaddons-dev libkf5kio-dev libkf5widgetsaddons-dev \
libkf5notifyconfig-dev libkf5newstuff-dev libkf5xmlgui-dev libkf5declarative-dev \
libkf5notifications-dev libkf5guiaddons-dev libkf5textwidgets-dev libkf5purpose-dev \
libkf5iconthemes-dev kdoctools-dev libkf5crash-dev libkf5filemetadata-dev  kio \
kinit qtdeclarative5-dev libqt5svg5-dev qml-module-qtquick-controls \
qtmultimedia5-dev qtquickcontrols2-5-dev breeze-icon-theme
</pre>
 
=== Multimedia stack ===
 
If your distribution packages a recent enough version of MLT (>= 6.20.0), 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)
 
<pre>
sudo apt install libmlt++-dev libmlt-dev melt frei0r-plugins ffmpeg
</pre>
 
=== Dependencies for localization  ===
 
There are some additional dependencies required by the specific script to fetch the translations:
<pre>
sudo apt install ruby subversion gnupg2 gettext
</pre>
 
== Getting the source code ==
 
=== Cloning the git  repo ===
The easiest  way to get Kdenlive source code is to clone the git repo:
 
<pre>
git clone https://invent.kde.org/multimedia/kdenlive
</pre>
 
=== Selecting the  branch ===
 
You should generally base your developments on the master branch
 
<pre>
cd kdenlive
git checkout master
</pre>
 
or if you want to get the code for a given release
 
<pre>
cd kdenlive
git checkout release/20.04
</pre>
 
==  Building Kdenlive ==
Create a directory for the build inside the kdenlive directory:
 
<pre>
mkdir build
cd build
</pre>
 
To avoid problems with plugins and libraries, it is easier to install Kdenlive in /usr:
 
<pre>
cmake .. -DKDE_INSTALL_USE_QT_SYS_PATHS=ON -DCMAKE_INSTALL_PREFIX=/usr -DRELEASE_BUILD=OFF
</pre>
 
Alternately you can build it with debug flags (advanced users only ;-)  and you need to have clang installed ) :
 
<pre>
cmake .. -DKDE_INSTALL_USE_QT_SYS_PATHS=ON \
-DCMAKE_INSTALL_PREFIX=/usr -DCMAKE_BUILD_TYPE=Debug \
-DCMAKE_CXX_COMPILER=/usr/bin/clang++ \
-DECM_ENABLE_SANITIZERS='address' \
-DBUILD_TESTING=ON -DBUILD_FUZZING=ON -DBUILD_COVERAGE=OFF \
-DRELEASE_BUILD=OFF
</pre>
 
 
You may get a warning "Qt5 WebKitWidgets not found. You cannot use your Freesound.org credentials, only preview files can be downloaded from the Online Resources Widget": as this is a very specific feature requiring a rather large dependency, you can just ignore it. But if you want to use that feature, you must install libqt5webkit5-dev.
 
 
To fetch the translations of the application :
<pre>
make fetch-translations
</pre>
 
This should create a po sub-directory in your build directory. You have then to create a symbolic link to this po subdirectory :
 
<pre>
cd ..
ln -s build/po/ po
cd build/
</pre>
 
Then build and install:
<pre>
make -j5
sudo make install
</pre>
 
You can then start your compiled version by simply entering:
<pre>
kdenlive
</pre>
 
If you have compiled it in debug mode, you may encounter errors like
<pre>
SUMMARY: AddressSanitizer: new-delete-type-mismatch (/usr/bin/kdenlive+0x643020)  
==6982==HINT: if you don't care about these errors you may set ASAN_OPTIONS=new_delete_type_mismatch=0
==6982==ABORTING
</pre>
 
As the hint says, the you can solve this with
<pre>
export ASAN_OPTIONS=new_delete_type_mismatch=0
</pre>


== 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].


Now that you've got a working dev environment, you can [https://invent.kde.org/multimedia/kdenlive/-/issues?label_name%5B%5D=Junior+Job find 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!
 
You can also gain more general knowledge by [https://techbase.kde.org/Development/Tutorials exploring the tutorials on TechBase].
 
== IDE Setup ==
Pick your favourite!


=== Setting up KDevelop ===
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].
Open KDevelop and go to Project > Open/Import project
Then select the CMakeLists.txt file in the kdenlive source folder.
You can now start hacking on Kdenlive!
 
=== 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 an 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.


== MLT documentation ==
== MLT documentation ==
Line 184: Line 25:
     strace build/src/kdenlive 2>&1 | grep kdenliveui.rc
     strace build/src/kdenlive 2>&1 | grep kdenliveui.rc


== Wayland ==
== Kdenlives File Format ==
To avoid flickering here are some Kdenlive envvars that work with Sway?
A description on Kdenlives file format can be found [https://invent.kde.org/multimedia/kdenlive/-/blob/master/dev-docs/fileformat.md here].
<pre>
QT_QPA_PLATFORM=wayland-egl
SDL_VIDEODRIVER=wayland
XDG_SESSION_TYPE=wayland
</pre>


== Contact ==
== Contact ==


=== Chat ===
See [[Kdenlive#Contact|Contact]]
 
There are several chat groups on Telegram and [[Matrix]]. The groups existing on both services are bridged via a bot so you can choose your preferred one. Not all groups exist an all services.
 
==== Telegram ====
 
* [https://t.me/kdenlive Main group]
* [https://t.me/kdenlive_dev Developer group]
* [https://t.me/kdenlivemanual Manual Contributors group]
 
==== Matrix ====
 
* [https://webchat.kde.org/#/room/#kdenlive:kde.org Main group]
* [https://webchat.kde.org/#/room/#kdenlive-dev:kde.org Developer group]
 
=== Mailing List ===
The kdenlive developer mailing list archives can be found [http://mail.kde.org/pipermail/kdenlive/ here]
 
A searchable archive of the kdenlive developer mailing list can be found [http://www.mail-archive.com/[email protected]/ here]
 
Information on how to subscribe can be found [https://mail.kde.org/mailman/listinfo/kdenlive here]

Latest revision as of 15:56, 22 August 2023

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

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