Commit 2bebf0d9 authored by Vincent Pinon's avatar Vincent Pinon
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Refine build instructions

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# Building
# Building Kdenlive
*This page describes how to build Kdenlive with its dependencies.*
## Base procedure
Kdenlive usually requires the latest version of MLT, in which go several API updates, bufixes and optimizations.
## Building Kdenlive
### Get the build dependencies
Building is done in 3 steps:
You can use your distribution packages information (if not too old) to easily get a complete build environment:
1. Install the development dependencies and remove existing installations
2. Clone the repositories
3. Build and install the projects
### Get the development dependencies
# Debian/Ubuntu -- Enable deb-src entries /etc/apt/sources beforehand
sudo apt build-dep mlt kdenlive
# Fedora/CentOS -- Install builddep beforehand
dnf builddep mlt kdenlive
# OpenSUSE
zypper source-install --build-deps-only mlt kdenlive
Kdenlive usually requires the latest versions of MLT. MLT depends on frei0r,
and on Ubuntu frei0r needs to be built as well as there is no
`frei0r-plugins-dev` package.
### Clone the repositories
First, install the requirements. For Ubuntu 20.04 and 19.10, the required packages are:
In your development directory, run:
# Basic packages
sudo apt install git build-essential cmake cmake-extras pkg-config
git clone
git clone
# frei0r
sudo apt install libopencv-dev libcairo-dev libgavl-dev
### Build and install the projects
sudo apt install libavformat-dev libsdl2-dev libswscale-dev libavfilter-dev \
libavdevice-dev libgdk-pixbuf2.0-dev libpango1.0-dev libexif-dev \
libfftw3-dev libebur128-dev librubberband-dev librtaudio-dev \
libvidstab-dev libxml2-dev qt5-default libqt5svg5-dev
You should decide where you want to install your builds:
# Kdenlive
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 \
appstream gettext libv4l-dev libqt5webkit5-dev librttr-dev breeze ffmpeg
- by default it goes to `/usr/local` (good option if you are admin of the machine, normally programs there are automatically detected);
- you may use `$HOME/.local` user-writable directory (good option if you don't want to play with admin rights, programs there are also usually found)
- you may want to override the distribution files in `/usr` (then you have to remove MLT & Kdenlive binary & data packages first)
- you can pick any destination you like (eg in `/opt` or anywhere in `$HOME`, then you will have to set several environment variables for programs, libs and data to be found)
Let's define that destination as `INSTALL_PREFIX` variable; also you can set `JOBS` variable to the number of threads your CPU can offer for builds.
Most development packages will already be installed with the following command:
And build the dependencies (MLT) before the project (Kdenlive):
# Ubuntu
# Enable deb-src entries /etc/apt/sources beforehand!
sudo apt-get build-dep mlt kdenlive
INSTALL_PREFIX=$HOME/.local # or any other choice
# OpenSuse
zypper build-dep
cd mlt
./configure --enable-gpl --enable-gpl3 --prefix=/home/soft/kdenlive
make -j$JOBS
make install
# 'sudo make install' if INSTALL_PREFIX is not user-writable
# Fedora
# Install builddep beforehand
dnf builddep
# Kdenlive
cd ../kdenlive
mkdir build
cd build
make -j$JOBS
make install
# 'sudo make install' if INSTALL_PREFIX is not user-writable
**Important:** If you are going to install the projects to your `/usr` after
building them, make sure to remove existing packages of Kdenlive, MLT, and
frei0r beforehand!
Note that `make install` is required for Kdenlive, otherwise the effects will not be installed and cannot be used.
apt purge kdenlive frei0r-plugins libmlt++3
### Run Kdenlive
### Clone frei0r, MLT, and Kdenlive
If you didn't build in a system path in which all libs and data are automatically found, you will need to set environment variables to point to them.
This is done by the auto-generated script in `kdenlive/build` that must be sourced (to keep variables set in current shell, unlike just executing the script):
git clone
git clone
git clone
## Various development tricks
### Build it!
### Debugging
Now you can build and install the projects. As Kdenlive depends on MLT which
depends on frei0r, build and install them in reverse order.
Having debug symbols helps getting much more useful information from crash logs or analyzers outputs; this is enabled at configure stage.
- in MLT, append `--enable-debug` to `./configure` line
- in Kdenlive, append `-DCMAKE_BUILD_TYPE=Debug` to `cmake` line
Note that `make install` is required for Kdenlive, otherwise the effects will
not be installed and cannot be used.
### Running tests
For frei0r, MLT, and Kdenlive (in that order), run the following steps
inside their directory to build, compile, and install it.
Kdenlive test coverage is focused mostly on timeline model code (extending tests to more parts is highly desired). To run those tests, append to `cmake` line:
# Create a build directory – the build files remain in here
mkdir build
cd build
### Fuzzer
# Check dependencies and configure the build process
Kdenlive embeds a fuzzing engine that can detect crashes and auto-generate tests. This can be activated in `cmake` line with:
# Compile
### Speeding up compilations
# Install the compiled files
sudo make install
Ninja build systems, compared to make, seems faster and better detecting which files are necessary to rebuild. You can enable it appending `-GNinja` to `cmake` line
CCache also helps: `-DCMAKE_CXX_COMPILER_LAUNCHER=ccache`
#### Building on Ubuntu 20.04
### Analyzers
Ubuntu 20.04 provides OpenCV 4.2 which is not supported by the frei0r plugins yet. Run CMake with
You can configure Kdenlive to embed tooling for runtime analysis, for example appending to cmake line:
This one will report in terminal all memory handling errors found during execution.
### Building OpenCV tracking module
### Install Kdenlive to a local path
As alternative to installing Kdenlive system wide in `/usr`, it can also be
installed in a custom directory, for example `~/.local`, in order to still have
a global sytem version for comparison. In that case, the `` script in
the build directory has to be executed prior to running Kdenlive from the
installation directory; it sets some environment variables.
MLT/Kdenlive tracking effect relies on a "contrib" a OpenCV module that is not shipped by distributions.
We build it in our AppImage but you may want it on your system (note OpenCV deserves its reputation of being difficult to build!).
# Configure with a different install directory
cmake .. -DCMAKE_INSTALL_PREFIX=~/.local
wget -O opencv-4.3.0.tar.gz
wget -O opencv_contrib-4.3.0.tar.gz
tar xaf opencv-4.3.0.tar.gz
tar xaf opencv_contrib-4.3.0.tar.gz
cd opencv-4.3.0
mkdir build
cd build
# Compile and install (sudo is not required for ~/.local)
make install
### Building frei0r
# Load environment variables
chmod u+x
You may be interested in building latest frei0r effects library. So get dependencies, clone repository, and build-install:
# Run Kdenlive
sudo apt build-dep frei0r
git clone
cd frei0r
mkdir build
cd build
Note: as of 20.04, frei0r doesn't support recent OpenCV (and effects using it seemed not very stable)
### Building in Docker
For checking if the dependencies are still up-to-date, it is possible to run
all the above commands inside a Docker container with a fresh Ubuntu, for
Note that Kdenlive cannot be run from inside the Docker container as it is a
GUI application and Docker is console-only.
It is possible to run the above commands inside a container, with a fresh Ubuntu for example.
Note that Kdenlive cannot be easily run from inside the Docker container as it is a GUI application.
# Spin up a Docker container
# The --rm flag removes the container after it is stopped.
docker run -it --rm ubuntu:19.10
docker run -it --rm ubuntu:20.04
# Now install the dependencies etc.
# Note that you are root in the container, and sudo neither exists nor works.
......@@ -159,7 +152,6 @@ apt install …
## Translating Kdenlive
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