背景
默认自带的QWebEngine 因版权问题不支持音视频功能，需要自己编译源码以支持。
平台：Linux（UOS V20 1050）
Qt：5.15.2
准备工作
- 下载 Qt 5.15.2 对应版本源码，使用镜像网站或者Qt Maintenance Tool工具下载。
- 配置 Qt 环境变量
vim ~/.bashrc将以下内容追加到bashrc文件后
#QT ENVexport PATH=/home/Leou/Qt/5.15.2/gcc_64/bin:$PATHexport LD_LIBRARY_PATH=/home/Leou/Qt/5.15.2/gcc_64/lib:$LD_LIBRARY_PATHexport QT_PLUGIN_PATH=/home/Leou/Qt/5.15.2/gcc_64/plugins:$QT_PLUGIN_PATHexport QML2_PATH=/home/Leou/Qt/5.15.2/gcc_64/qml:$QML2_PATH刷新使其生效
source ~/.bashrc这个阶段可以预先安装所需的库：
On all platforms, the following tools are required at build time:
- Python 2.7.5 or later. Python 3 is not supported.
- Bison, Flex
- GPerf
- Node.js version 8 or later (version 12 or later is recommended)
这些是最基本的要求，实际上还有很多库需要安装，可参考qtwebengine-platform-notes
编译
创建build目录，并使用qmake ../qtwebengine.pro -- -webengine-proprietary-codecs命令
Leou@Leou-PC:/media/Leou/qtwebengine$ mkdir buildLeou@Leou-PC:/media/Leou/qtwebengine$ cd build/Leou@Leou-PC:/media/Leou/qtwebengine/build$ qmake ../qtwebengine.pro -- -webengine-proprietary-codecs输出信息：
Info: creating stash file /media/Leou/qtwebengine/build/.qmake.stashInfo: creating cache file /media/Leou/qtwebengine/build/.qmake.cacheRunning configuration tests...Checking for architecture supported... yesChecking for bison... noChecking for submodule initialized... yesChecking for build path without whitespace... yesChecking for platform supported... Checking for gperf... yesChecking for flex... noChecking for host pkg-config... /usr/bin/pkg-configChecking for jumbo build merge limit... 8Checking for linker supports -z noexecstack... yesChecking for x11... yesChecking for libdrm... yesChecking for xcomposite... yesChecking for xcursor... yesChecking for xi... yesChecking for xtst... yesChecking for python2... /usr/bin/python2Checking for d-bus... yesChecking for fontconfig... yesChecking for freetype >= 2.4.2... yesChecking for glib-2.0 >= 2.32.0... yesChecking for glibc > 2.16... yesChecking for jsoncpp... noChecking for khr... yesChecking for lcms2... noChecking for libevent... noChecking for libvpx... noChecking for libwebp, libwebpmux and libwebpdemux... noChecking for compatible libxml2 and libxslt... noChecking for minizip... noChecking for system ninja... noChecking for nss >= 3.26... yesChecking for opus... noChecking for protobuf... noChecking for re2... noChecking for snappy... noChecking for zlib... yesDone running configuration tests.Configure summary:Qt WebEngine Build Tools:Use System Ninja ....................... noUse System Gn .......................... noJumbo Build Merge Limit ................ 8Developer build ........................ noSanitizer .............................. noQtWebEngine required system libraries:fontconfig ........................... yesdbus ................................. yesnss .................................. yeskhr .................................. yesglibc ................................ yesQtWebEngine required system libraries for qpa-xcb:x11 .................................. yeslibdrm ............................... yesxcomposite ........................... yesxcursor .............................. yesxi ................................... yesxtst ................................. yesOptional system libraries used:re2 .................................. noicu .................................. nolibwebp, libwebpmux and libwebpdemux . noopus ................................. noffmpeg ............................... nolibvpx ............................... nosnappy ............................... noglib ................................. yeszlib ................................. yesminizip .............................. nolibevent ............................. nojsoncpp .............................. noprotobuf ............................. nolibxml2 and libxslt .................. nolcms2 ................................ nopng .................................. noJPEG ................................. noharfbuzz ............................. nofreetype ............................. yesNote: The following modules are not being compiled in this configuration:webenginecorewebenginewebenginewidgetspdfpdfwidgetsWARNING: Tool bison is required to build QtWebEngine.WARNING: Tool bison is required to build QtPdf.WARNING: QtWebEngine will not be built.WARNING: QtPdf will not be built.Qt is now configured for building. Just run 'make'.Once everything is built, you must run 'make install'.Qt will be installed into '/home/Leou/Qt/5.15.2/gcc_64'.Prior to reconfiguration, make sure you remove any leftovers fromthe previous build.查看输出信息并安装缺失的库：
安装bison
sudo apt install bison安装flex
sudo apt install flex安装后，疑似有缓存，所以导致未更新，可删除build下的产物，再运行一次qmake ../qtwebengine.pro -- -webengine-proprietary-codecs
输出信息：
Leou@Leou-PC:/media/Leou/QtSrc/Src/qtwebengine/build$ qmake ../qtwebengine.pro -- -webengine-proprietary-codecsRunning configuration tests...Done running configuration tests.Configure summary:Qt WebEngine Build Tools:Use System Ninja ....................... noUse System Gn .......................... noJumbo Build Merge Limit ................ 8Developer build ........................ noSanitizer .............................. noQtWebEngine required system libraries:fontconfig ........................... yesdbus ................................. yesnss .................................. yeskhr .................................. yesglibc ................................ yesQtWebEngine required system libraries for qpa-xcb:x11 .................................. yeslibdrm ............................... yesxcomposite ........................... yesxcursor .............................. yesxi ................................... yesxtst ................................. yesOptional system libraries used:re2 .................................. noicu .................................. nolibwebp, libwebpmux and libwebpdemux . noopus ................................. noffmpeg ............................... nolibvpx ............................... nosnappy ............................... noglib ................................. yeszlib ................................. yesminizip .............................. nolibevent ............................. nojsoncpp .............................. noprotobuf ............................. nolibxml2 and libxslt .................. nolcms2 ................................ nopng .................................. noJPEG ................................. noharfbuzz ............................. nofreetype ............................. yesQt WebEngineCore:Embedded build ......................... noFull debug information ................. noPepper Plugins ......................... yesPrinting and PDF ....................... yesProprietary Codecs ..................... yesSpellchecker ........................... yesNative Spellchecker .................... noWebRTC ................................. yesPipeWire over GIO ...................... noGeolocation ............................ yesWebChannel support ..................... yesKerberos Authentication ................ noExtensions ............................. yesNode.js ................................ noSupport qpa-xcb ........................ yesUse ALSA ............................... yesUse PulseAudio ......................... yesQt WebEngineQml:Support Qt WebEngine Qml ............... yesUI Delegates ........................... yesTest Support ........................... noQt WebEngineWidgets:Support Qt WebEngine Widgets ........... yesQt PDF:Support V8 ............................. noSupport XFA ............................ noSupport XFA-BMP ........................ noSupport XFA-GIF ........................ noSupport XFA-PNG ........................ noSupport XFA-TIFF ....................... noQt PDF Widgets:Support Qt PDF Widgets ................. yesWARNING: Building without node.js will disable some features of QtWebEngine DevTools.Qt is now configured for building. Just run 'make'.Once everything is built, you must run 'make install'.Qt will be installed into '/home/Leou/Qt/5.15.2/gcc_64'.Prior to reconfiguration, make sure you remove any leftovers fromthe previous build.执行make
make -j14如果出错，则多执行几次make命令
执行结束后：
mv -f libqwebengineview.so ../../../plugins/designer/libqwebengineview.soobjcopy --only-keep-debug ../../../plugins/designer/libqwebengineview.so ../../../plugins/designer/libqwebengineview.so.debug && objcopy --strip-debug ../../../plugins/designer/libqwebengineview.so && objcopy --add-gnu-debuglink=../../../plugins/designer/libqwebengineview.so.debug ../../../plugins/designer/libqwebengineview.so && chmod -x ../../../plugins/designer/libqwebengineview.so.debugmake[3]: 离开目录“/media/Leou/QtSrc/Src/qtwebengine/build/src/plugins/qwebengineview”make[2]: 离开目录“/media/Leou/QtSrc/Src/qtwebengine/build/src/plugins”rm -f libQt5PdfWidgets.so.5.15.2 libQt5PdfWidgets.so libQt5PdfWidgets.so.5 libQt5PdfWidgets.so.5.15g++ -Wl,--no-undefined -Wl,--version-script,QtPdfWidgets.version -Wl,--enable-new-dtags -Wl,-z,origin -Wl,-rpath,\$ORIGIN -Wl,-rpath,\$ORIGIN -Wl,-rpath-link,/home/Leou/Qt/5.15.2/gcc_64/lib -shared -Wl,-Bsymbolic-functions -Wl,-soname,libQt5PdfWidgets.so.5 -o libQt5PdfWidgets.so.5.15.2 .obj/qpdfview.o-L/home/qt/openssl-1.1.1g/lib /media/Leou/QtSrc/Src/qtwebengine/build/lib/libQt5Pdf.so /home/Leou/Qt/5.15.2/gcc_64/lib/libQt5Widgets.so /home/Leou/Qt/5.15.2/gcc_64/lib/libQt5Gui.so /home/Leou/Qt/5.15.2/gcc_64/lib/libQt5Core.so -lpthread -lGL ln -s libQt5PdfWidgets.so.5.15.2 libQt5PdfWidgets.soln -s libQt5PdfWidgets.so.5.15.2 libQt5PdfWidgets.so.5ln -s libQt5PdfWidgets.so.5.15.2 libQt5PdfWidgets.so.5.15rm -f ../../lib/libQt5PdfWidgets.so.5.15.2mv -f libQt5PdfWidgets.so.5.15.2 ../../lib/libQt5PdfWidgets.so.5.15.2rm -f ../../lib/libQt5PdfWidgets.sorm -f ../../lib/libQt5PdfWidgets.so.5rm -f ../../lib/libQt5PdfWidgets.so.5.15mv -f libQt5PdfWidgets.so ../../lib/libQt5PdfWidgets.somv -f libQt5PdfWidgets.so.5 ../../lib/libQt5PdfWidgets.so.5mv -f libQt5PdfWidgets.so.5.15 ../../lib/libQt5PdfWidgets.so.5.15objcopy --only-keep-debug ../../lib/libQt5PdfWidgets.so.5.15.2 ../../lib/libQt5PdfWidgets.so.5.15.2.debug && objcopy --strip-debug ../../lib/libQt5PdfWidgets.so.5.15.2 && objcopy --add-gnu-debuglink=../../lib/libQt5PdfWidgets.so.5.15.2.debug ../../lib/libQt5PdfWidgets.so.5.15.2 && chmod -x ../../lib/libQt5PdfWidgets.so.5.15.2.debugmake[2]: 离开目录“/media/Leou/QtSrc/Src/qtwebengine/build/src/pdfwidgets”make[1]: 离开目录“/media/Leou/QtSrc/Src/qtwebengine/build/src”可以看到lib下的产物
安装
直接替换安装当前Qt 的 QWebEngine
make install测试
使用Qt的simplebrowser demo程序打开 html5test 网站测试功能：
可见已经支持了h264、mp3等音视频功能。
总结
在Linux上编译QWebEngine总体上比较容易，没有编译chromium那么困难。
https://doc.qt.io/qt-5/qtwebengine-platform-notes.html