chore(CI): msvc build with ffmpeg

.github/workflows/windows.yml

@@ -8,7 +8,7 @@ jobs:
     strategy:
       matrix:
         include:
-          - qt_ver: '6.9.0'
+          - qt_ver: '6.9.1'
             vs: '2022'
             aqt_arch: 'win64_msvc2022_64'
             msvc_arch: 'x64'
@@ -40,6 +40,11 @@ jobs:
         cmake .\dependencies_src\extra-cmake-modules -Bbuild_dependencies/extra-cmake-modules -DCMAKE_INSTALL_PREFIX="dependencies_bin" -DBUILD_TESTING=OFF || goto :error
         cmake --build build_dependencies/extra-cmake-modules --config Release --target=install || goto :error
         echo ::endgroup::
+        echo ::group::===== FFmpeg =====
+        curl -fsSL -o ffmpeg-shared.7z https://github.com/GyanD/codexffmpeg/releases/download/7.1.1/ffmpeg-7.1.1-full_build-shared.7z
+        7z x ffmpeg-shared.7z -y -o"dependencies_src"
+        set FFMPEG_ROOT=%PWD%\dependencies_src\ffmpeg-7.1.1-full_build-shared
+        echo ::endgroup::
         echo ::group::===== Gperf (required by KCodecs) =====
         choco install gperf
         echo ::endgroup::