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| | Building Qt Multimedia and FFmpeg from source are described in the Qt Documentation: |
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| ==My build setup==
| | * [https://doc-snapshots.qt.io/qt6-dev/qtmultimedia-building-ffmpeg.html Building FFmpeg from source]. |
| | | * [https://doc-snapshots.qt.io/qt6-dev/qtmultimedia-building-from-source.html Building Qt Multimedia from sources] |
| * OS: Windows 11 with dev drive mounted on D: (Using a dev drive makes builds faster when using Windows Defender antivirus) | |
| * Qt source tree: D:\qt\qt6\
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| * Build directory containing all builds: D:\qt\build\
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| * Main (host) build for dev branch: D:\qt\build\dev\
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| * Visual Studio 2022 (MSVC)
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| * Don't have perl in path as it can cause hard to understand build failures
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| * Have cmake in path
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| ==Developer setup for Qt Multimedia on Windows==
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| ===Initializing Qt Repo for Qt 6 with necessary dependencies for QtMultimedia===
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| This init-repository initializes the necessary Qt submodules for working with QtMultimedia. By only initializing the repository with the necessary modules, the main Qt build is faster than doing a full build.<blockquote>C:\Strawberry\perl\bin\perl init-repository --module-subset=qtbase,qtquick3d,qtdeclarative,qtsvg,qtshadertools,qtmultimedia,qtrepotools -f --codereview-username johanseg</blockquote>
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| ===Building FFmpeg on Windows===
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| #Install 7-zip from provisioning: Run qt6\coin\provisioning\common\windows\install-sevenzip.ps1 as admin
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| #*Needed by provisioning script for FFmpeg to unzip downloaded FFmpeg
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| #Install msys2 from provisioning: Run qt6\coin\provisioning\common\windows\install-msys2.ps1 as admin
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| #*Needed by provisioning script for FFmpeg because FFmpeg requires tools from msys to configure
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| #Install FFmpeg from provisioning: Run qt6\coin\provisioning\common\windows\install-ffmpeg.ps1 as admin
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| #*Since I only need MSVC build, I edit the install-ffmpeg.ps1 first, to comment out unnecessary versions
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| #*This sets FFMPEG_DIR=C:\FFmpeg-n6.0\build\msvc\installed\
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| ===Configure Qt main build===
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| I build Qt as stand-alone module to make builds run faster when working in QtMultimedia. But first, we need to build the necessary dependencies. I do this from command line with D:\qt\build\dev as current directory.<blockquote>..\..\qt6\configure.bat -debug -developer-build -submodules QtMultimedia -nomake tests -nomake examples -- -DFFMPEG_DIR=C:\FFmpeg-n6.0\build\msvc\installed --fresh & ninja</blockquote>I work almost exclusively using debug builds. If you need a release build, configure the release build in a separate build directory. This is a developer build, and we can use D:\qt\build\dev\qtbase\ as CMAKE_PREFIX_PATH when developing other Qt modules. By configuring this way, QtMultimedia is built, which is not strictly necessary since I develop QtMultimedia in a separate build tree, but it is an easy way to make sure all QtMultimedia dependencies are built.
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| ===Configure Qt multimedia===
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| I configure QtMultimedia using a CMakeUserPresets.json file that is located in D:\qt\qt6\qtmultimedia instead of using a configure script. This way, I can open the D:\qt\qt6\qtmultimedia as a folder in Visual Studio and configure it from there.
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| The benefit of using CMakeUserPresets.json is that Visual Studio knows how to debug the tests and examples. I have not found a way that allows Visual Studio to use an existing CMakeCache as a starting point.
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| <code>
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| {
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| "version": 5,
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| "configurePresets": [
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| {
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| "name": "msvc-64",
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| "hidden": true,
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| "condition": {
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| "type": "equals",
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| "lhs": "${hostSystemName}",
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| "rhs": "Windows"
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| },
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| "generator": "Ninja",
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| "cacheVariables": {
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| "CMAKE_CXX_COMPILER": "cl.exe",
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| "CMAKE_C_COMPILER": "cl.exe"
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| },
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| "toolset": {
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| "value": "v143,host=x64",
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| "strategy": "external"
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| },
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| "architecture": {
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| "value": "x64",
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| "strategy": "external"
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| }
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| },
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| {
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| "name": "Debug",
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| "hidden": true,
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| "cacheVariables": {
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| "CMAKE_BUILD_TYPE": "Debug"
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| }
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| },
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| {
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| "name": "qt6-dev-base",
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| "hidden": true,
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| "cacheVariables": {
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| "FEATURE_developer_build": true,
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| "BUILD_qttools": false,
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| "BUILD_qtdoc": false,
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| "BUILD_qttranslations": false,
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| "QT_BUILD_EXAMPLES": false,
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| "QT_BUILD_EXAMPLES_BY_DEFAULT": false,
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| "QT_BUILD_EXAMPLES_AS_EXTERNAL": false,
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| "QT_BUILD_TESTS": false,
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| "QT_BUILD_TESTS_BY_DEFAULT": false
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| },
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| "environment": {
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| "PATH": "D:/qt/build/dev/qtbase/bin;$penv{PATH}"
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| }
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| },
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| {
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| "name": "qt6-dev-debug",
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| "hidden": true,
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| "inherits": [
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| "qt6-dev-base",
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| "msvc-64",
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| "Debug"
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| ],
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| "cacheVariables": {
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| "CMAKE_PREFIX_PATH": "D:/qt/build/dev/qtbase/"
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| },
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| "environment": {
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| "PATH": "D:/qt/build/dev/qtbase/bin;$penv{PATH}"
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| }
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| },
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| {
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| "name": "QtMultimedia",
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| "inherits": "qt6-dev-debug",
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| "binaryDir": "D:/qt/build/qtmultimedia/",
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| "cacheVariables": {
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| "QT_BUILD_EXAMPLES": true,
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| "QT_BUILD_EXAMPLES_BY_DEFAULT": true,
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| "QT_BUILD_TESTS": true,
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| "QT_BUILD_TESTS_BY_DEFAULT": true,
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| "QT_BUILD_EXAMPLES_AS_EXTERNAL": false,
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| "QT_BUILD_MANUAL_TESTS": false,
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| "QT_DEPLOY_FFMPEG": true,
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| "FEATURE_ffmpeg": true,
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| "FFMPEG_DIR": "C:\\ffmpeg-n6.0\\build\\msvc\\installed"
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| }
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| }
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| ],
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| "buildPresets": [
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| {
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| "name": "Build-Qt-Multimedia-MSVC-Debug-64",
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| "displayName": "Build Qt Multimedia MSVC Debug 64",
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| "configurePreset": "QtMultimedia"
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| }
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| ]
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| }
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| </code>
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