How to Update MLT Framework Separately on Linux

This article provides a straightforward guide on how to update the MLT (Media Lovin’ Toolkit) framework independently of the Kdenlive application on Linux. It covers the preparation steps, compiling the latest version from the official source code, and configuring your system to ensure Kdenlive utilizes the updated framework.

Why Update MLT Independently?

Kdenlive relies on the MLT framework as its backend video rendering engine. Often, major bug fixes or new transition effects are released in MLT before they are packaged into your Linux distribution’s stable Kdenlive release. Updating MLT independently allows you to leverage these backend improvements immediately.

Method 1: Compiling MLT from Source (Universal)

Compiling from the official GitHub repository is the most reliable way to get the latest version of MLT independently of your package manager.

Step 1: Install Build Dependencies

Before compiling, you must install the necessary development tools and libraries.

For Ubuntu/Debian-based systems, run:

sudo apt update
sudo apt install build-essential cmake git libxml2-dev libfftw3-dev libswscale-dev libavdevice-dev libavfilter-dev libavformat-dev libswresample-dev qtbase5-dev qtdeclarative5-dev

For Fedora, run:

sudo dnf groupinstall "Development Tools"
sudo dnf install cmake git libxml2-devel fftw-devel ffmpeg-devel qt5-qtbase-devel qt5-qtdeclarative-devel

Step 2: Clone the MLT Repository

Clone the official MLT source code from GitHub:

git clone https://github.com/mltframework/mlt.git
cd mlt

Step 3: Build and Install MLT

Create a build directory, configure the project with CMake, compile it, and install it to your system.

# Create and enter build directory
cmake -B build -DCMAKE_INSTALL_PREFIX=/usr/local -DMOD_QT=ON -DMOD_OPENCV=ON

# Compile the source code using all available CPU cores
cmake --build build -j$(nproc)

# Install the updated framework
sudo cmake --install build

Step 4: Update Shared Library Cache

Ensure your system recognizes the newly installed libraries in /usr/local/lib:

sudo ldconfig

Method 2: Updating via Package Managers

If you prefer not to compile from source, you can use distribution-specific repositories to get newer builds of MLT.

For Arch Linux / Manjaro

Arch users can easily install the latest development version of MLT from the Arch User Repository (AUR):

yay -S mlt-git

For Ubuntu / Linux Mint

You can use the Kdenlive Stable PPA, which often updates the MLT framework packages faster than the standard Ubuntu repositories:

sudo add-apt-repository ppa:kdenlive/kdenlive-stable
sudo apt update
sudo apt install libmlt7 mlt-noise-guerilla

Verifying the Update

To confirm that the MLT framework has been updated successfully, check the version of the melt command-line tool (the authoring tool for MLT):

melt --version

This command should output the newly installed version number. When you next launch Kdenlive, it will automatically detect and utilize the updated MLT library installed on your system path.