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QtAV编译以及使用

作者：互联网

Qt视频播放器，自己按照网上的方法，成功试了一遍。

第一个链接是方法。第二个链接是 环境变量配置。

http://www.javashuo.com/article/p-hsuvjvjc-nr.html

前言

本文详细描述Window 10 和Ubuntu 14.04使用Qt Creator编译QtAV 1.12的步骤linux

1 Windows

1.1 依赖环境

第一种方法：
下载编译好的ffmpeg-3.4.2-win64-dev和ffmpeg-3.4.2-win64-shared，解压获得git

D:\qt-workspace\ffmpeg-3.4.2-win64-dev
D:\qt-workspace\ffmpeg-3.4.2-win64-shared

第二种方法：
QtAV官方有提供编译好的依赖库 QtAV-depends-windows-x86%2Bx64.7z，解压获得github

D:\qt-workspace\QtAV-depends-windows-x86+x64

1.2 QtAV编译

下载QtAV-1.12.0，解压获得QtAV-1.12.0，在Qt Creator中导入QtAV项目
Qt Creator导入QtAV
而后在Qt Creator设置编译时候的环境变量，换成本身ffmpeg解压的路径web

变量值
CPATH D:\qt-workspace\ffmpeg-3.4.2-win64-dev\include
LD_LIBRARY_PATH D:\qt-workspace\ffmpeg-3.4.2-win64-dev\lib
LIBRARY_PATH D:\qt-workspace\ffmpeg-3.4.2-win64-dev\lib

QtAv编译环境变量设置
若是使用的是QtAV提供编译好的依赖库的话，须要注意压缩包里提供了32位和64位的库，我要编译64位的，因此路径是…\lib\x64，若是要编译32位的，则路径是…/lib，变量值以下ubuntu

变量值
CPATH D:\qt-workspace\QtAV-depends-windows-x86+x64\include
LD_LIBRARY_PATH D:\qt-workspace\QtAV-depends-windows-x86+x64\lib\x64
LIBRARY_PATH D:\qt-workspace\QtAV-depends-windows-x86+x64\lib\x64

编译的时候报错
error: avutil is required, but compiler can not find it
缘由可能没有安装好ffmpeg或者上述的环境变量设置的路径有误，或者ffmpeg版本不对windows

编译完成，点击Qt Creator侧边栏的小电脑图标，选择须要运行的程序
QtAV Demo选择
好比选择了player，再点击运行按钮，可能运行会报以下的错误ide

22:02:28: Starting D:\qt-workspace\build-QtAV-Desktop_Qt_5_12_3_MinGW_64_bit-Release\bin\Player.exe ...
22:02:29: 程序异常结束。
22:02:29: The process was ended forcefully.
22:02:29: D:/qt-workspace/build-QtAV-Desktop_Qt_5_12_3_MinGW_64_bit-Release/bin/Player.exe crashed.

在1.1小节解压获得的ffmpeg-3.4.2-win64-shared中，把bin目录下的动态连接库复制到QtAV的编译目录的bin目录下，好比个人目录是svg

D:\qt-workspace\ffmpeg-3.4.2-win64-shared\bin
D:\qt-workspace\build-QtAV-Desktop_Qt_5_12_3_MinGW_64_bit-Release\bin

须要复制的动态连接库是
ffmpeg-3.4.2-win64-shared dll
再次运行就不会有错误了
QtAV Demo player
若是使用的是QtAV提供编译好的依赖库的话，注意编译64位要…bin/x64目录下的，32位要…/bin目录下的，以下所示ui

D:\qt-workspace\QtAV-depends-windows-x86+x64\bin\x64
D:\qt-workspace\build-QtAV-Desktop_Qt_5_12_3_MinGW_64_bit-Release\bin

dll

1.3 QtAV安装

在QtAV编译目录下双击sdk_install.bat便可，好比个人目录是this

D:\qt-workspace\build-QtAV-Desktop_Qt_5_12_3_MinGW_64_bit-Release

以后库文件和头文件等就会安装到Qt Sdk相关路径下，其余使用QtAV的应用就能够依赖上了

1.4 QtAV使用

新建一个Demo

#include<WidgetRenderer.h>
#include<QApplication>
#include<QtAV>
#include<QtAVWidgets>
#include<QtAV/AVPlayer.h>

using namespace QtAV;

intmain(int argc,char*argv[]){
    QApplication a(argc, argv);
    WidgetRenderer renderer;
    renderer.show();
    Widgets::registerRenderers();
    AVPlayer player;
    player.setRenderer(&renderer);
    player.play("test.mov");
    return a.exec();
}

在Demo的pro文件中加入

QT += av avwidgets
LIBS += -lQtAV1 -lQtAVWidgets1

若是Demo的pro文件没有添加LIBS += -lQtAV1 -lQtAVWidgets1，编译的时候可能会报错undefined reference to，注意是-lQtAV1 -lQtAVWidgets1，不是-lQtAV -lQtAVWidgets

g++ -Wl,-subsystem,console -mthreads -o debug\test.exe debug/main.o  -LF:\Qt5.12.3\5.12.3\mingw73_64\lib F:\Qt5.12.3\5.12.3\mingw73_64\lib\libQt5OpenGLd.a F:\Qt5.12.3\5.12.3\mingw73_64\lib\libQt5Widgetsd.a F:\Qt5.12.3\5.12.3\mingw73_64\lib\libQt5Guid.a F:\Qt5.12.3\5.12.3\mingw73_64\lib\libQt5Cored.a   
debug/main.o: In function `main':
D:\qt-workspace\build-test-Desktop_Qt_5_12_3_MinGW_64_bit-Debug/../test/main.cpp:12: undefined reference to `__imp__ZN4QtAV14WidgetRendererC1EP7QWidget6QFlagsIN2Qt10WindowTypeEE'
D:\qt-workspace\build-test-Desktop_Qt_5_12_3_MinGW_64_bit-Debug/../test/main.cpp:14: undefined reference to `__imp__ZN4QtAV7Widgets17registerRenderersEv'
D:\qt-workspace\build-test-Desktop_Qt_5_12_3_MinGW_64_bit-Debug/../test/main.cpp:15: undefined reference to `__imp__ZN4QtAV8AVPlayerC1EP7QObject'
D:\qt-workspace\build-test-Desktop_Qt_5_12_3_MinGW_64_bit-Debug/../test/main.cpp:16: undefined reference to `__imp__ZN4QtAV8AVPlayer11setRendererEPNS_13VideoRendererE'
D:\qt-workspace\build-test-Desktop_Qt_5_12_3_MinGW_64_bit-Debug/../test/main.cpp:17: undefined reference to `__imp__ZN4QtAV8AVPlayer4playERK7QString'
D:\qt-workspace\build-test-Desktop_Qt_5_12_3_MinGW_64_bit-Debug/../test/main.cpp:15: undefined reference to `__imp__ZN4QtAV8AVPlayerD1Ev'
D:\qt-workspace\build-test-Desktop_Qt_5_12_3_MinGW_64_bit-Debug/../test/main.cpp:15: undefined reference to `__imp__ZN4QtAV8AVPlayerD1Ev'
debug/main.o: In function `QtAV::QPainterRenderer::~QPainterRenderer()':
F:/Qt5.12.3/5.12.3/mingw73_64/include/QtAV/QPainterRenderer.h:31: undefined reference to `__imp__ZTVN4QtAV16QPainterRendererE'
F:/Qt5.12.3/5.12.3/mingw73_64/include/QtAV/QPainterRenderer.h:31: undefined reference to `__imp__ZN4QtAV13VideoRendererD2Ev'
debug/main.o: In function `QtAV::WidgetRenderer::~WidgetRenderer()':
F:/Qt5.12.3/5.12.3/mingw73_64/include/QtAVWidgets/WidgetRenderer.h:35: undefined reference to `__imp__ZTVN4QtAV14WidgetRendererE'
F:/Qt5.12.3/5.12.3/mingw73_64/include/QtAVWidgets/WidgetRenderer.h:35: undefined reference to `__imp__ZTVN4QtAV14WidgetRendererE'
F:/Qt5.12.3/5.12.3/mingw73_64/include/QtAVWidgets/WidgetRenderer.h:35: undefined reference to `__imp__ZTVN4QtAV14WidgetRendererE'
collect2.exe: error: ld returned 1 exit status
mingw32-make[1]: *** [Makefile.Debug:65: debug/test.exe] Error 1
mingw32-make: *** [Makefile:38: debug] Error 2
mingw32-make[1]: Leaving directory 'D:/qt-workspace/build-test-Desktop_Qt_5_12_3_MinGW_64_bit-Debug'
23:18:26: 进程"F:\Qt5.12.3\Tools\mingw730_64\bin\mingw32-make.exe"退出，退出代码 2 。
Error while building/deploying project test (kit: Desktop Qt 5.12.3 MinGW 64-bit)
When executing step "Make"

编译完成以后，把ffmpeg的动态库复制到应用的目录下，参照1.2小节运行Demo的作法
若是运行的时候报错QWidget: Must construct a QApplication before a QWidget

23:47:18: Starting D:\qt-workspace\build-test1-Desktop_Qt_5_12_3_MinGW_64_bit-Debug\debug\test1.exe ...
QWidget: Must construct a QApplication before a QWidget
23:47:24: 程序异常结束。
23:47:24: The process was ended forcefully.
23:47:24: D:/qt-workspace/build-test1-Desktop_Qt_5_12_3_MinGW_64_bit-Debug/debug/test1.exe crashed.

多是应用编译成debug版本的了，QtAV库是release版本的，把应用编译成release版本便可

2 Ubuntu

2.1 依赖环境

安装如下包，其中libopenal和libpulse是两个音频输出库

sudo apt-get install libglu1-mesa-dev freeglut3-dev mesa-common-dev
sudo apt-get install libavutil-dev libavcodec-dev libavformat-dev libswscale-dev

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

而后下载ffmpeg3.4.6，解压获得ffmpeg-3.4.6，在解压目录里执行

./configure --enable-shared --disable-x86asm --prefix=/youpath/ffmpeg-3.4.6/install

2.2 QtAV编译

下载QtAV-1.12.0，解压获得QtAV-1.12.0，在Qt Creator中导入QtAV项目
Qt Creator导入QtAV
须要注意的是在qmake以前，必须安装libopenal等库，否则会没有声音输出
而后在Qt Creator设置编译时候的环境变量

变量值
CPATH /youpath/ffmpeg-3.4.6/install/include
LD_LIBRARY_PATH /opt/Qt5.12.3/Tools/QtCreator/lib/Qt/lib:/youpath/ffmpeg-3.4.6/install/lib
LIBRARY_PATH /youpath/ffmpeg-3.4.6/install/lib

LD_LIBRARY_PATH这个环境变量可能原本就有，那么在原来的值后面追加ffmpeg lib安装路径便可
QtAv编译环境变量设置
编译的时候报错
error: avutil is required, but compiler can not find it
缘由可能没有安装好ffmpeg或者上述的环境变量设置的路径有误，或者ffmpeg版本不对

编译完成，点击Qt Creator侧边栏的小电脑图标，选择须要运行的程序
QtAV Demo选择
好比选择了player，再点击运行按钮，就能够看到Demo程序了
QtAV Demo player

2.3 QtAV安装

进入QtAV的编译目录，好比个人是

/home/anruliu/Desktop/workspace/sourcecode/qt/build-QtAV-Desktop_Qt_5_12_3_GCC_64bit-Debug

里面有个sdk_install.sh文件，执行

chmod +x sdk_install.sh
sudo ./sdk_install.sh

以后库文件和头文件等就会安装到Qt Sdk相关路径下，其余使用QtAV的应用就能够依赖上了

2.4 QtAV使用

新建一个Demo

#include<WidgetRenderer.h>
#include<QApplication>
#include<QtAV>
#include<QtAVWidgets>
#include<QtAV/AVPlayer.h>

using namespace QtAV;

intmain(int argc,char*argv[]){
    QApplication a(argc, argv);
    WidgetRenderer renderer;
    renderer.show();
    Widgets::registerRenderers();
    AVPlayer player;
    player.setRenderer(&renderer);
    player.play("test.mov");
    return a.exec();
}

在Demo的pro文件中加入

QT += av avwidgets
LIBS += -lQtAV -lQtAVWidgets

再按照2.2小节的步骤添加CPATH、LD_LIBRARY_PATH、LIBRARY_PATH等环境变量，编译运行便可
QtAV Demo
若是Demo的pro文件没有添加LIBS += -lQtAV -lQtAVWidgets，编译的时候可能会报错undefined reference to

g++ -c -pipe -g -std=gnu++11 -Wall -W -D_REENTRANT -fPIC -DQT_DEPRECATED_WARNINGS -DQT_QML_DEBUG -DQT_AVWIDGETS_LIB -DQT_AV_LIB -DQT_OPENGL_LIB -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -I../xxx -I. -I/opt/Qt5.12.3/5.12.3/gcc_64/include -I/opt/Qt5.12.3/5.12.3/gcc_64/include/QtAVWidgets -I/opt/Qt5.12.3/5.12.3/gcc_64/include/QtAV -I/opt/Qt5.12.3/5.12.3/gcc_64/include/QtOpenGL -I/opt/Qt5.12.3/5.12.3/gcc_64/include/QtWidgets -I/opt/Qt5.12.3/5.12.3/gcc_64/include/QtGui -I/opt/Qt5.12.3/5.12.3/gcc_64/include/QtCore -I. -isystem /usr/include/libdrm -I/opt/Qt5.12.3/5.12.3/gcc_64/mkspecs/linux-g++ -o main.o ../xxx/main.cpp
g++ -Wl,-rpath,/opt/Qt5.12.3/5.12.3/gcc_64/lib -o xxx main.o   -L/opt/Qt5.12.3/5.12.3/gcc_64/lib -lQt5OpenGL -lQt5Widgets -lQt5Gui -lQt5Core -lGL -lpthread   
main.o: In function `main':
/home/anruliu/Desktop/workspace/sourcecode/qt/build-xxx-Desktop_Qt_5_12_3_GCC_64bit-Debug/../xxx/main.cpp:12: undefined reference to `QtAV::WidgetRenderer::WidgetRenderer(QWidget*, QFlags<Qt::WindowType>)'
/home/anruliu/Desktop/workspace/sourcecode/qt/build-xxx-Desktop_Qt_5_12_3_GCC_64bit-Debug/../xxx/main.cpp:14: undefined reference to `QtAV::Widgets::registerRenderers()'
/home/anruliu/Desktop/workspace/sourcecode/qt/build-xxx-Desktop_Qt_5_12_3_GCC_64bit-Debug/../xxx/main.cpp:15: undefined reference to `QtAV::AVPlayer::AVPlayer(QObject*)'
/home/anruliu/Desktop/workspace/sourcecode/qt/build-xxx-Desktop_Qt_5_12_3_GCC_64bit-Debug/../xxx/main.cpp:16: undefined reference to `QtAV::AVPlayer::setRenderer(QtAV::VideoRenderer*)'
/home/anruliu/Desktop/workspace/sourcecode/qt/build-xxx-Desktop_Qt_5_12_3_GCC_64bit-Debug/../xxx/main.cpp:17: undefined reference to `QtAV::AVPlayer::play(QString const&)'
/home/anruliu/Desktop/workspace/sourcecode/qt/build-xxx-Desktop_Qt_5_12_3_GCC_64bit-Debug/../xxx/main.cpp:15: undefined reference to `QtAV::AVPlayer::~AVPlayer()'
/home/anruliu/Desktop/workspace/sourcecode/qt/build-xxx-Desktop_Qt_5_12_3_GCC_64bit-Debug/../xxx/main.cpp:15: undefined reference to `QtAV::AVPlayer::~AVPlayer()'
main.o: In function `QtAV::QPainterRenderer::~QPainterRenderer()':
/opt/Qt5.12.3/5.12.3/gcc_64/include/QtAV/QPainterRenderer.h:31: undefined reference to `vtable for QtAV::QPainterRenderer'
/opt/Qt5.12.3/5.12.3/gcc_64/include/QtAV/QPainterRenderer.h:31: undefined reference to `QtAV::VideoRenderer::~VideoRenderer()'
main.o: In function `QtAV::WidgetRenderer::~WidgetRenderer()':
/opt/Qt5.12.3/5.12.3/gcc_64/include/QtAVWidgets/WidgetRenderer.h:35: undefined reference to `vtable for QtAV::WidgetRenderer'
/opt/Qt5.12.3/5.12.3/gcc_64/include/QtAVWidgets/WidgetRenderer.h:35: undefined reference to `vtable for QtAV::WidgetRenderer'
/opt/Qt5.12.3/5.12.3/gcc_64/include/QtAVWidgets/WidgetRenderer.h:35: undefined reference to `vtable for QtAV::WidgetRenderer'
collect2: error: ld returned 1 exit status
make: *** [xxx] Error 1
20:05:29: 进程"/usr/bin/make"退出，退出代码 2 。
Error while building/deploying project xxx (kit: Desktop Qt 5.12.3 GCC 64bit)
The kit Desktop Qt 5.12.3 GCC 64bit has configuration issues which might be the root cause for this problem.
When executing step "Make"

参考文献

[1] Qt第三方库QtAV— ubuntu编译与运行
[2] QtAV官方文档

 

QtCreator配置环境变量

https://blog.csdn.net/nicai_xiaoqinxi/article/details/88419217

使用QtCreator编译程序往往会出现一些编译的问题(库路径或头文件路径找不到),QtCreator可以配置环境变量以解决一些上述的问题。

 

1. 进入Projects(项目)

 

 

2. 点击Details(详情)

 

 

3. 如有需要可以清除系统环境变量

 

   4. 找到INCLUDE与LIB进行设置

 

 

5.如需要修改或添加其他变量在右侧按钮设置即可

————————————————

版权声明：本文为CSDN博主「Qt君」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。

原文链接：https://blog.csdn.net/nicai_xiaoqinxi/article/details/88419217

 

 

前言

本文详细描述Window 10 和Ubuntu 14.04使用Qt Creator编译QtAV 1.12的步骤linux

1 Windows

1.1 依赖环境

第一种方法：
下载编译好的ffmpeg-3.4.2-win64-dev和ffmpeg-3.4.2-win64-shared，解压获得git

D:\qt-workspace\ffmpeg-3.4.2-win64-dev
D:\qt-workspace\ffmpeg-3.4.2-win64-shared

第二种方法：
QtAV官方有提供编译好的依赖库 QtAV-depends-windows-x86%2Bx64.7z，解压获得github

D:\qt-workspace\QtAV-depends-windows-x86+x64

1.2 QtAV编译

下载QtAV-1.12.0，解压获得QtAV-1.12.0，在Qt Creator中导入QtAV项目
Qt Creator导入QtAV
而后在Qt Creator设置编译时候的环境变量，换成本身ffmpeg解压的路径web

变量值
CPATH D:\qt-workspace\ffmpeg-3.4.2-win64-dev\include
LD_LIBRARY_PATH D:\qt-workspace\ffmpeg-3.4.2-win64-dev\lib
LIBRARY_PATH D:\qt-workspace\ffmpeg-3.4.2-win64-dev\lib

QtAv编译环境变量设置
若是使用的是QtAV提供编译好的依赖库的话，须要注意压缩包里提供了32位和64位的库，我要编译64位的，因此路径是…\lib\x64，若是要编译32位的，则路径是…/lib，变量值以下ubuntu

变量值
CPATH D:\qt-workspace\QtAV-depends-windows-x86+x64\include
LD_LIBRARY_PATH D:\qt-workspace\QtAV-depends-windows-x86+x64\lib\x64
LIBRARY_PATH D:\qt-workspace\QtAV-depends-windows-x86+x64\lib\x64

编译的时候报错
error: avutil is required, but compiler can not find it
缘由可能没有安装好ffmpeg或者上述的环境变量设置的路径有误，或者ffmpeg版本不对windows

编译完成，点击Qt Creator侧边栏的小电脑图标，选择须要运行的程序
QtAV Demo选择
好比选择了player，再点击运行按钮，可能运行会报以下的错误ide

22:02:28: Starting D:\qt-workspace\build-QtAV-Desktop_Qt_5_12_3_MinGW_64_bit-Release\bin\Player.exe ...
22:02:29: 程序异常结束。
22:02:29: The process was ended forcefully.
22:02:29: D:/qt-workspace/build-QtAV-Desktop_Qt_5_12_3_MinGW_64_bit-Release/bin/Player.exe crashed.

在1.1小节解压获得的ffmpeg-3.4.2-win64-shared中，把bin目录下的动态连接库复制到QtAV的编译目录的bin目录下，好比个人目录是svg

D:\qt-workspace\ffmpeg-3.4.2-win64-shared\bin
D:\qt-workspace\build-QtAV-Desktop_Qt_5_12_3_MinGW_64_bit-Release\bin

须要复制的动态连接库是
ffmpeg-3.4.2-win64-shared dll
再次运行就不会有错误了
QtAV Demo player
若是使用的是QtAV提供编译好的依赖库的话，注意编译64位要…bin/x64目录下的，32位要…/bin目录下的，以下所示ui

D:\qt-workspace\QtAV-depends-windows-x86+x64\bin\x64
D:\qt-workspace\build-QtAV-Desktop_Qt_5_12_3_MinGW_64_bit-Release\bin

dll

1.3 QtAV安装

在QtAV编译目录下双击sdk_install.bat便可，好比个人目录是this

D:\qt-workspace\build-QtAV-Desktop_Qt_5_12_3_MinGW_64_bit-Release

以后库文件和头文件等就会安装到Qt Sdk相关路径下，其余使用QtAV的应用就能够依赖上了

1.4 QtAV使用

新建一个Demo

#include<WidgetRenderer.h>
#include<QApplication>
#include<QtAV>
#include<QtAVWidgets>
#include<QtAV/AVPlayer.h>

using namespace QtAV;

intmain(int argc,char*argv[]){
    QApplication a(argc, argv);
    WidgetRenderer renderer;
    renderer.show();
    Widgets::registerRenderers();
    AVPlayer player;
    player.setRenderer(&renderer);
    player.play("test.mov");
    return a.exec();
}

在Demo的pro文件中加入

QT += av avwidgets
LIBS += -lQtAV1 -lQtAVWidgets1

若是Demo的pro文件没有添加LIBS += -lQtAV1 -lQtAVWidgets1，编译的时候可能会报错undefined reference to，注意是-lQtAV1 -lQtAVWidgets1，不是-lQtAV -lQtAVWidgets

g++ -Wl,-subsystem,console -mthreads -o debug\test.exe debug/main.o  -LF:\Qt5.12.3\5.12.3\mingw73_64\lib F:\Qt5.12.3\5.12.3\mingw73_64\lib\libQt5OpenGLd.a F:\Qt5.12.3\5.12.3\mingw73_64\lib\libQt5Widgetsd.a F:\Qt5.12.3\5.12.3\mingw73_64\lib\libQt5Guid.a F:\Qt5.12.3\5.12.3\mingw73_64\lib\libQt5Cored.a   
debug/main.o: In function `main':
D:\qt-workspace\build-test-Desktop_Qt_5_12_3_MinGW_64_bit-Debug/../test/main.cpp:12: undefined reference to `__imp__ZN4QtAV14WidgetRendererC1EP7QWidget6QFlagsIN2Qt10WindowTypeEE'
D:\qt-workspace\build-test-Desktop_Qt_5_12_3_MinGW_64_bit-Debug/../test/main.cpp:14: undefined reference to `__imp__ZN4QtAV7Widgets17registerRenderersEv'
D:\qt-workspace\build-test-Desktop_Qt_5_12_3_MinGW_64_bit-Debug/../test/main.cpp:15: undefined reference to `__imp__ZN4QtAV8AVPlayerC1EP7QObject'
D:\qt-workspace\build-test-Desktop_Qt_5_12_3_MinGW_64_bit-Debug/../test/main.cpp:16: undefined reference to `__imp__ZN4QtAV8AVPlayer11setRendererEPNS_13VideoRendererE'
D:\qt-workspace\build-test-Desktop_Qt_5_12_3_MinGW_64_bit-Debug/../test/main.cpp:17: undefined reference to `__imp__ZN4QtAV8AVPlayer4playERK7QString'
D:\qt-workspace\build-test-Desktop_Qt_5_12_3_MinGW_64_bit-Debug/../test/main.cpp:15: undefined reference to `__imp__ZN4QtAV8AVPlayerD1Ev'
D:\qt-workspace\build-test-Desktop_Qt_5_12_3_MinGW_64_bit-Debug/../test/main.cpp:15: undefined reference to `__imp__ZN4QtAV8AVPlayerD1Ev'
debug/main.o: In function `QtAV::QPainterRenderer::~QPainterRenderer()':
F:/Qt5.12.3/5.12.3/mingw73_64/include/QtAV/QPainterRenderer.h:31: undefined reference to `__imp__ZTVN4QtAV16QPainterRendererE'
F:/Qt5.12.3/5.12.3/mingw73_64/include/QtAV/QPainterRenderer.h:31: undefined reference to `__imp__ZN4QtAV13VideoRendererD2Ev'
debug/main.o: In function `QtAV::WidgetRenderer::~WidgetRenderer()':
F:/Qt5.12.3/5.12.3/mingw73_64/include/QtAVWidgets/WidgetRenderer.h:35: undefined reference to `__imp__ZTVN4QtAV14WidgetRendererE'
F:/Qt5.12.3/5.12.3/mingw73_64/include/QtAVWidgets/WidgetRenderer.h:35: undefined reference to `__imp__ZTVN4QtAV14WidgetRendererE'
F:/Qt5.12.3/5.12.3/mingw73_64/include/QtAVWidgets/WidgetRenderer.h:35: undefined reference to `__imp__ZTVN4QtAV14WidgetRendererE'
collect2.exe: error: ld returned 1 exit status
mingw32-make[1]: *** [Makefile.Debug:65: debug/test.exe] Error 1
mingw32-make: *** [Makefile:38: debug] Error 2
mingw32-make[1]: Leaving directory 'D:/qt-workspace/build-test-Desktop_Qt_5_12_3_MinGW_64_bit-Debug'
23:18:26: 进程"F:\Qt5.12.3\Tools\mingw730_64\bin\mingw32-make.exe"退出，退出代码 2 。
Error while building/deploying project test (kit: Desktop Qt 5.12.3 MinGW 64-bit)
When executing step "Make"

编译完成以后，把ffmpeg的动态库复制到应用的目录下，参照1.2小节运行Demo的作法
若是运行的时候报错QWidget: Must construct a QApplication before a QWidget

23:47:18: Starting D:\qt-workspace\build-test1-Desktop_Qt_5_12_3_MinGW_64_bit-Debug\debug\test1.exe ...
QWidget: Must construct a QApplication before a QWidget
23:47:24: 程序异常结束。
23:47:24: The process was ended forcefully.
23:47:24: D:/qt-workspace/build-test1-Desktop_Qt_5_12_3_MinGW_64_bit-Debug/debug/test1.exe crashed.

多是应用编译成debug版本的了，QtAV库是release版本的，把应用编译成release版本便可

2 Ubuntu

2.1 依赖环境

安装如下包，其中libopenal和libpulse是两个音频输出库

sudo apt-get install libglu1-mesa-dev freeglut3-dev mesa-common-dev
sudo apt-get install libavutil-dev libavcodec-dev libavformat-dev libswscale-dev

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

而后下载ffmpeg3.4.6，解压获得ffmpeg-3.4.6，在解压目录里执行

./configure --enable-shared --disable-x86asm --prefix=/youpath/ffmpeg-3.4.6/install

2.2 QtAV编译

下载QtAV-1.12.0，解压获得QtAV-1.12.0，在Qt Creator中导入QtAV项目
Qt Creator导入QtAV
须要注意的是在qmake以前，必须安装libopenal等库，否则会没有声音输出
而后在Qt Creator设置编译时候的环境变量

变量值
CPATH /youpath/ffmpeg-3.4.6/install/include
LD_LIBRARY_PATH /opt/Qt5.12.3/Tools/QtCreator/lib/Qt/lib:/youpath/ffmpeg-3.4.6/install/lib
LIBRARY_PATH /youpath/ffmpeg-3.4.6/install/lib

LD_LIBRARY_PATH这个环境变量可能原本就有，那么在原来的值后面追加ffmpeg lib安装路径便可
QtAv编译环境变量设置
编译的时候报错
error: avutil is required, but compiler can not find it
缘由可能没有安装好ffmpeg或者上述的环境变量设置的路径有误，或者ffmpeg版本不对

编译完成，点击Qt Creator侧边栏的小电脑图标，选择须要运行的程序
QtAV Demo选择
好比选择了player，再点击运行按钮，就能够看到Demo程序了
QtAV Demo player

2.3 QtAV安装

进入QtAV的编译目录，好比个人是

/home/anruliu/Desktop/workspace/sourcecode/qt/build-QtAV-Desktop_Qt_5_12_3_GCC_64bit-Debug

里面有个sdk_install.sh文件，执行

chmod +x sdk_install.sh
sudo ./sdk_install.sh

以后库文件和头文件等就会安装到Qt Sdk相关路径下，其余使用QtAV的应用就能够依赖上了

2.4 QtAV使用

新建一个Demo

#include<WidgetRenderer.h>
#include<QApplication>
#include<QtAV>
#include<QtAVWidgets>
#include<QtAV/AVPlayer.h>

using namespace QtAV;

intmain(int argc,char*argv[]){
    QApplication a(argc, argv);
    WidgetRenderer renderer;
    renderer.show();
    Widgets::registerRenderers();
    AVPlayer player;
    player.setRenderer(&renderer);
    player.play("test.mov");
    return a.exec();
}

在Demo的pro文件中加入

QT += av avwidgets
LIBS += -lQtAV -lQtAVWidgets

再按照2.2小节的步骤添加CPATH、LD_LIBRARY_PATH、LIBRARY_PATH等环境变量，编译运行便可
QtAV Demo
若是Demo的pro文件没有添加LIBS += -lQtAV -lQtAVWidgets，编译的时候可能会报错undefined reference to

g++ -c -pipe -g -std=gnu++11 -Wall -W -D_REENTRANT -fPIC -DQT_DEPRECATED_WARNINGS -DQT_QML_DEBUG -DQT_AVWIDGETS_LIB -DQT_AV_LIB -DQT_OPENGL_LIB -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -I../xxx -I. -I/opt/Qt5.12.3/5.12.3/gcc_64/include -I/opt/Qt5.12.3/5.12.3/gcc_64/include/QtAVWidgets -I/opt/Qt5.12.3/5.12.3/gcc_64/include/QtAV -I/opt/Qt5.12.3/5.12.3/gcc_64/include/QtOpenGL -I/opt/Qt5.12.3/5.12.3/gcc_64/include/QtWidgets -I/opt/Qt5.12.3/5.12.3/gcc_64/include/QtGui -I/opt/Qt5.12.3/5.12.3/gcc_64/include/QtCore -I. -isystem /usr/include/libdrm -I/opt/Qt5.12.3/5.12.3/gcc_64/mkspecs/linux-g++ -o main.o ../xxx/main.cpp
g++ -Wl,-rpath,/opt/Qt5.12.3/5.12.3/gcc_64/lib -o xxx main.o   -L/opt/Qt5.12.3/5.12.3/gcc_64/lib -lQt5OpenGL -lQt5Widgets -lQt5Gui -lQt5Core -lGL -lpthread   
main.o: In function `main':
/home/anruliu/Desktop/workspace/sourcecode/qt/build-xxx-Desktop_Qt_5_12_3_GCC_64bit-Debug/../xxx/main.cpp:12: undefined reference to `QtAV::WidgetRenderer::WidgetRenderer(QWidget*, QFlags<Qt::WindowType>)'
/home/anruliu/Desktop/workspace/sourcecode/qt/build-xxx-Desktop_Qt_5_12_3_GCC_64bit-Debug/../xxx/main.cpp:14: undefined reference to `QtAV::Widgets::registerRenderers()'
/home/anruliu/Desktop/workspace/sourcecode/qt/build-xxx-Desktop_Qt_5_12_3_GCC_64bit-Debug/../xxx/main.cpp:15: undefined reference to `QtAV::AVPlayer::AVPlayer(QObject*)'
/home/anruliu/Desktop/workspace/sourcecode/qt/build-xxx-Desktop_Qt_5_12_3_GCC_64bit-Debug/../xxx/main.cpp:16: undefined reference to `QtAV::AVPlayer::setRenderer(QtAV::VideoRenderer*)'
/home/anruliu/Desktop/workspace/sourcecode/qt/build-xxx-Desktop_Qt_5_12_3_GCC_64bit-Debug/../xxx/main.cpp:17: undefined reference to `QtAV::AVPlayer::play(QString const&)'
/home/anruliu/Desktop/workspace/sourcecode/qt/build-xxx-Desktop_Qt_5_12_3_GCC_64bit-Debug/../xxx/main.cpp:15: undefined reference to `QtAV::AVPlayer::~AVPlayer()'
/home/anruliu/Desktop/workspace/sourcecode/qt/build-xxx-Desktop_Qt_5_12_3_GCC_64bit-Debug/../xxx/main.cpp:15: undefined reference to `QtAV::AVPlayer::~AVPlayer()'
main.o: In function `QtAV::QPainterRenderer::~QPainterRenderer()':
/opt/Qt5.12.3/5.12.3/gcc_64/include/QtAV/QPainterRenderer.h:31: undefined reference to `vtable for QtAV::QPainterRenderer'
/opt/Qt5.12.3/5.12.3/gcc_64/include/QtAV/QPainterRenderer.h:31: undefined reference to `QtAV::VideoRenderer::~VideoRenderer()'
main.o: In function `QtAV::WidgetRenderer::~WidgetRenderer()':
/opt/Qt5.12.3/5.12.3/gcc_64/include/QtAVWidgets/WidgetRenderer.h:35: undefined reference to `vtable for QtAV::WidgetRenderer'
/opt/Qt5.12.3/5.12.3/gcc_64/include/QtAVWidgets/WidgetRenderer.h:35: undefined reference to `vtable for QtAV::WidgetRenderer'
/opt/Qt5.12.3/5.12.3/gcc_64/include/QtAVWidgets/WidgetRenderer.h:35: undefined reference to `vtable for QtAV::WidgetRenderer'
collect2: error: ld returned 1 exit status
make: *** [xxx] Error 1
20:05:29: 进程"/usr/bin/make"退出，退出代码 2 。
Error while building/deploying project xxx (kit: Desktop Qt 5.12.3 GCC 64bit)
The kit Desktop Qt 5.12.3 GCC 64bit has configuration issues which might be the root cause for this problem.
When executing step "Make"

参考文献

[1] Qt第三方库QtAV— ubuntu编译与运行
[2] QtAV官方文档

标签：Qt,QtAV,Desktop,编译,64,workspace,使用,qt
来源： https://www.cnblogs.com/warmlight/p/16473246.html