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vpicaver edited this page Nov 14, 2015 · 68 revisions

Uninstall QtAV SDK before building to avoid header files confliction. Run sdk_uninstall.bat/sh under your build dir

0. Prerequisites

  • Get QtAV source code

    use git

    git clone https://github.com/wang-bin/QtAV.git
git submodule update --init

  • FFmpeg>=1.0/Libav>=9.0. The latest release is recommended.

    You can download latest prebuilt FFmpeg, or build yourself

  • Libass headers is required if you need ass subtitle rendering support.

Other requirements are:

  • Windows

    OpenAL(Optional). OpenAL is not required since QtAV1.8.0. XAudio2 is always used. XAudio2 supports XP~windows 10, WinRT and windows phone. Windows 8 and later natively supports XAudio2. For Windows 7 and older, you have to install the driver from DirectX to run.

  • OS X, iOS None. System OpenAL is used

  • Android

    On Windows you must put mingw32-make.exe in one of %PATH% to avoid qmake error.

  • Ubuntu

    OpenAL(recommended) or PulseAudio. To enable all supported features, you must install libass, XVideo and VA-API dev packages.

    sudo apt-get install libopenal-dev libpulse-dev libva-dev libxv-dev libass-dev libegl1-mesa-dev

    You may have to install VA-API drivers to make VA-API available at runtime

1. Setup the environment

You MUST let your compiler know where FFmpeg headers and libraries are. Otherwise you will get an error when running qmake. If they are already be where they should be, for example you install from apt on ubunt, just skip this step.

Choose one of the following methods.

(Recommended) Put FFmpeg headers and libs into Qt directories

It's the simplest and best way. Qt include and lib dir are always searched in QtAV. It should work for all platforms, including android, iOS, WinRT and meego etc.

You can build and install FFmpeg easily into your Qt directory (mac and linux) by:

./configure --prefix=/PATH_TO_YOUR_QT_DIR/Qt/5.5/clang_64
make
make install

(NOT Recommended)Use Environment Vars

  • VC: INCLUDE and LIB

    command line:

    set INCLUDE=ffmpeg_path\include;openal_path\include;%INCLUDE%
set LIB=ffmpeg_path\lib;openal_path\lib;%LIB%

  • gcc/clang: CPATH and LIBRARY_PATH

    unix shell environment(including mingw with sh.exe) command line

    export CPATH=ffmpeg_path/include:openal_path/include:$CPATH
export LIBRARY_PATH=ffmpeg_path/lib:openal_path/lib:$LIBRARY_PATH

    windows cmd.exe environment without UNIX Shell command line

    set CPATH=ffmpeg_path\include;openal_path\include;%CPATH%
set LIBRARY_PATH=ffmpeg_path\lib;openal_path\lib;%LIBRARY_PATH%

  • If build in QtCreator, open 'Projects' page and add/append the environment/values.

    QtCreator Settings

2. Build in QtCreator or command line

  • Command line build

    For most platforms, just run

    qmake
make -j4 #nmake or jom for msvc

    It's strongly recommended not to build in source dir(especially OSX).

    mkdir your_build_dir cd your_build_dir qmake QtAV_source_dir/QtAV.pro make -j4

    qmake will run check the required libraries at the first time, so you must make sure those libraries can be found by compiler.

    Then qmake will create a cache file .qmake.cache in your build dir. Cache file stores the check results, for example, whether portaudio is available. If you want to recheck, you can either delete .qmake.cache and run qmake again, or run

    qmake QtAV_source_dir/QtAV.pro -r "CONFIG+=recheck"

WARNING: If you are in windows mingw with sh.exe environment, you may need run qmake twice. I have not found out the reason behind this phenomenon.

Visual Studio/MSBuild

I don't put any vs project file in QtAV, because it's easy to create by qmake.

Open cmd

qmake -r -tp vc QtAV.pro

Then sln and vcxproj(vcproj) files will be created. Run msbuild /m to build the projects. You can also open QtAV.sln in your Visual Studio to Compile it.

Another solution is using Qt vs plugin. It will help you to load qmake projects(not tested).

NOTE: you may have to put ffmpeg/openal development files in Qt include and lib dir!

QtCreator With MSVC

QtCreator will detect VC compiler if it is installed. So it's easy to build in QtCreator

Build for Android on Windows

You may get qmake error libavutil is required, but compiler can not find it. That's because mingw32-make.exe can not be found in the config test step. An workaround is put your mingw32-make.exe to one of %PATH% dirs

Build Debian Packages

run

debuild -us -uc

in QtAV source tree

Link to Static FFmpeg and OpenAL

QtAV >=1.4.2 supports linking to static ffmpeg and openal libs. It's disabled by default. To enable it, add

CONFIG += static_ffmpeg static_openal

in $QtAV/.qmake.conf for Qt5 or $QtAV_BUILD_DIR/.qmake.cache

Ubuntu 12.04 Support

If QtAV, FFmpeg and OpenAL are built on newer OS, some symbols will not be found on 12.04. For example, clock_gettime is in both librt and glibc2.17, we must force the linker link against librt because 12.04 glibc does not have that symbol. add

CONFIG += glibc_compat

to .qmake.conf or .qmake.cache

CI

You can read the build log to see how they works.

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