link /NOLOGO /DYNAMICBASE /NXCOMPAT /DEBUG /OPT:REF /INCREMENTAL:NO /DLL /SUBSYSTEM:WINDOWS /VERSION:5.15 /OUT:C:\Qt\5.15.2\msvc2019_64\plugins\designer\qwebengineview.dll @C:\Users\paulw\AppData\Local\Temp\nmFF2C.tmp
   Création de la bibliothèque C:\Qt\5.15.2\msvc2019_64\plugins\designer\qwebengineview.lib et de l'objet C:\Qt\5.15.2\msvc2019_64\plugins\designer\qwebengineview.exp
        cd imageformats\ && ( if not exist Makefile C:\Qt\5.15.2\msvc2019_64\bin\qmake.exe -o Makefile C:\Qt\5.15.2\Src\qtwebengine\src\plugins\imageformats\imageformats.pro "QTWEBENGINE_CHROMIUM_FLAGS=--always-authorize-plugins --register-pepper-plugins=/plugins/ppapi/widevinecdmadapter.dll" ) && "C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.29.30133\bin\HostX64\x64\nmake.exe" -f Makefile

Microsoft (R) Program Maintenance Utility Version 14.29.30141.0
Copyright (C) Microsoft Corporation. Tous droits réservés.

et pas ça

        link /NOLOGO /DYNAMICBASE /NXCOMPAT /DEBUG /OPT:REF /INCREMENTAL:NO /DLL /SUBSYSTEM:WINDOWS /VERSION:5.15 /MANIFEST:embed /OUT:C:\Qt\5.15.2\msvc2019_64\lib\Qt5PdfWidgets.dll @C:\Users\paulw\AppData\Local\Temp\nm205E.tmp
        
           Création de la bibliothèque C:\Qt\5.15.2\msvc2019_64\lib\Qt5PdfWidgets.lib et de l'objet C:\Qt\5.15.2\msvc2019_64\lib\Qt5PdfWidgets.exp
        
                copy /y C:\Qt\5.15.2\msvc2019_64\lib\Qt5PdfWidgets.dll C:\Qt\5.15.2\msvc2019_64\bin
        
                1 fichier(s) copié(s).
        
                "C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.29.30133\bin\HostX64\x64\nmake.exe" -f Makefile.Debug all

????? sur une partie du programme ?

-- -webengine-proprietary-codecs

J'ai avancé,

j'ai créer un dossier C:\build_qtwebengine

je 'mis suis déplacé avec cd

J'y est mis qt5vars.bat

@echo off

REM Set up \Microsoft Visual Studio 2019, where <arch> is \c amd64, \c x86, etc.
CALL "C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Auxiliary\Build\vcvarsall.bat" amd64_x86

REM Edit this location to point to the source code of Qt
SET _ROOT=C:\Qt\Qt5.15.2\Src
SET _PYTHON=C:\Python27
SET _GN=C:\Qt\5.15.2\Src\qtwebengine\src\3rdparty\gn
SET _NINJA=C:\Qt\5.15.2\Src\qtwebengine\src\3rdparty\ninja
SET WindowsLibPath=C:\Program Files (x86)\Windows Kits\10\UnionMetadata\10.0.22000.0;C:\Program Files (x86)\Windows Kits\10\References\10.0.22000.0
SET WindowsSDK_ExecutablePath_x64=C:\Program Files (x86)\Microsoft SDKs\Windows\v10.0A\bin\NETFX 4.8 Tools\x64
SET WindowsSdkBinPath=C:\Program Files (x86)\Windows Kits\10\bin
SET WindowsSdkDir=C:\Program Files (x86)\Windows Kits\10
SET WindowsSDKLibVersion=10.0.22000.0
SET WindowsSdkVerBinPath=C:\Program Files (x86)\Windows Kits\10\bin\10.0.22000.0
SET WindowsSDKVersion=10.0.22000.0

SET PATH=%_ROOT%\qtbase\bin;%_ROOT%\gnuwin32\bin;%_ROOT%;%_PYTHON%;_GN;_NINJA;WindowsLibPath;WindowsSDK_ExecutablePath_x64;WindowsSdkBinPath;WindowsSdkBinPath;WindowsSdkDir;WindowsSDKLibVersion;WindowsSdkVerBinPath;WindowsSDKVersion;%PATH%

SET _ROOT=
SET _PYTHON=
SET _GN=
SET _NINJA=

REM Keeps the command line open when this script is run.
cmd /k

J'ai configurer avec :

"C:\Qt\5.15.2\msvc2019_64\bin\qmake.exe" "C:\Qt\5.15.2\Src\qtwebengine" -- -webengine-proprietary-codecs

et pour résultat j'ai eu :

Running configuration tests...
Done running configuration tests.

Configure summary:

Qt WebEngine Build Tools:
  Use System Ninja ....................... no
  Use System Gn .......................... no
  Jumbo Build Merge Limit ................ no
  Developer build ........................ no
  Sanitizer .............................. no
Qt WebEngineCore:
  Embedded build ......................... no
  Full debug information ................. no
  Pepper Plugins ......................... yes
  Printing and PDF ....................... yes
  Proprietary Codecs ..................... yes
  Spellchecker ........................... yes
  Native Spellchecker .................... no
  WebRTC ................................. yes
  PipeWire over GIO ...................... no
  Geolocation ............................ yes
  WebChannel support ..................... yes
  Kerberos Authentication ................ yes
  Extensions ............................. yes
  Node.js ................................ yes
Qt WebEngineQml:
  Support Qt WebEngine Qml ............... yes
  UI Delegates ........................... yes
  Test Support ........................... no
Qt WebEngineWidgets:
  Support Qt WebEngine Widgets ........... yes
Qt PDF:
  Support V8 ............................. no
  Support XFA ............................ no
  Support XFA-BMP ........................ no
  Support XFA-GIF ........................ no
  Support XFA-PNG ........................ no
  Support XFA-TIFF ....................... no
Qt PDF Widgets:
  Support Qt PDF Widgets ................. yes

Qt is now configured for building. Just run 'nmake'.
Once everything is built, you must run 'nmake install'.
Qt will be installed into 'C:\Qt\5.15.2\msvc2019_64'.

Prior to reconfiguration, make sure you remove any leftovers from
the previous build.

Je m'étais dis que j'avais réussit mais j'ai eu comme réponse de compilation avec nmake après 10 minutes :

Remarque : inclusion du fichier :   C:\Qt\5.15.2\Src\qtwebengine\src\3rdparty\chromium\third_party\webrtc\rtc_base/rtc_certificate.h
Remarque : inclusion du fichier :   C:\Qt\5.15.2\Src\qtwebengine\src\3rdparty\chromium\third_party\webrtc\rtc_base/rtc_certificate_generator.h
Remarque : inclusion du fichier :    C:\Qt\5.15.2\Src\qtwebengine\src\3rdparty\chromium\third_party\webrtc\rtc_base/ssl_identity.h
Remarque : inclusion du fichier :   C:\Qt\5.15.2\Src\qtwebengine\src\3rdparty\chromium\third_party\webrtc\rtc_base/ssl_stream_adapter.h
Remarque : inclusion du fichier :    C:\Qt\5.15.2\Src\qtwebengine\src\3rdparty\chromium\third_party\webrtc\rtc_base/stream.h
ninja: build stopped: subcommand failed.
NMAKE : fatal error U1077: 'call' : code retour '0x1'
Stop.
NMAKE : fatal error U1077: '"C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.29.30133\bin\HostX64\x86\nmake.exe"' : code retour '0x2'
Stop.
NMAKE : fatal error U1077: '(' : code retour '0x2'
Stop.
NMAKE : fatal error U1077: 'cd' : code retour '0x2'
Stop.
NMAKE : fatal error U1077: 'cd' : code retour '0x2'
Stop.

Vous seriez m'aider ??

J'essaye de recompiler QtWebEngine avec les codecs propriétaires

Mais j'ai une erreur :

C:\Qt\5.15.2\Src\qtwebengine>"C:\Qt\5.15.2\msvc2019_64\bin\qmake.exe" -- -webengine-proprietary-codecs

Running configuration tests...
Done running configuration tests.

Configure summary:

Qt WebEngine Build Tools:
  Use System Ninja ....................... no
  Use System Gn .......................... no
  Jumbo Build Merge Limit ................ no
  Developer build ........................ no
  Sanitizer .............................. no

Note: The following modules are not being compiled in this configuration:
    webenginecore
    webengine
    webenginewidgets
    pdf
    pdfwidgets

WARNING: QtWebEngine requires a Windows SDK version 10.0.18362 or newer.

WARNING: QtPdf requires a Windows SDK version 10.0.18362 or newer.

WARNING: QtWebEngine will not be built.

WARNING: QtPdf will not be built.

Qt is now configured for building. Just run 'nmake'.
Once everything is built, you must run 'nmake install'.
Qt will be installed into 'C:\Qt\5.15.2\msvc2019_64'.

Prior to reconfiguration, make sure you remove any leftovers from
the previous build.

J'ai aussi ajouté un fichier bat :
qt5vars.bat pour avoir les path pour la compilation

@echo off

REM Set up \Microsoft Visual Studio 2019, where <arch> is \c amd64, \c x86, etc.
CALL "C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Auxiliary\Build\vcvarsall.bat" amd64_x86 10.0.18362

REM Edit this location to point to the source code of Qt
SET _ROOT=C:\Qt\Qt5.15.2\Src
SET _PYTHON=C:\Python27

SET PATH=%_ROOT%\qtbase\bin;%_ROOT%\gnuwin32\bin;%_ROOT%;%_PYTHON%;%PATH%

SET _ROOT=

REM Keeps the command line open when this script is run.
cmd /k

J'ai instrallé les dépandances mais Windows SDK n'est pas détecté.