Fix FFmpeg D3D11VA implementation selection on Windows

tools/chatgui/ffmpeg/build_ffmpeg.sh

@@ -7,7 +7,7 @@ SRC_DIR="$BUILD_DIR/src"
 INSTALL_DIR="$BUILD_DIR/install"
 JOBS=$(nproc 2>/dev/null || echo 4)
 AMF_HEADERS_VERSION="${AMF_HEADERS_VERSION:-1.5.3}"
-FFMPEG_PROFILE_MARKER="$INSTALL_DIR/share/utun-chatgui-ffmpeg-minimal-v5"
+FFMPEG_PROFILE_MARKER="$INSTALL_DIR/share/utun-chatgui-ffmpeg-minimal-v6"
 
 case "$(uname -s)" in
     Linux)                      PLATFORM=linux ;;
@@ -273,6 +273,8 @@ for encoder in "${ENCODERS[@]}"; do CONFIGURE_ARGS+=("--enable-encoder=$encoder"
 if [ "$PLATFORM" = "windows" ]; then
     CONFIGURE_ARGS+=(
         --enable-amf --enable-d3d11va
+        # FFmpeg 7.1.2 добавляет dxva2_h264/hevc.o только по legacy-флагам; файлы содержат также d3d11va2.
+        --enable-hwaccel=h264_d3d11va --enable-hwaccel=hevc_d3d11va
         --enable-hwaccel=h264_d3d11va2 --enable-hwaccel=hevc_d3d11va2
         --enable-encoder=h264_amf --enable-encoder=hevc_amf --enable-encoder=av1_amf
     )
@@ -290,6 +292,8 @@ fi
 grep -Eq '^#define CONFIG_CBS_H265 1$' config.h || die "FFmpeg configure did not enable the HEVC header parser"
 grep -Eq '^#define CONFIG_TRACE_HEADERS_BSF 1$' config_components.h || die "FFmpeg configure did not enable trace_headers"
 if [ "$PLATFORM" = "windows" ]; then
+    grep -Eq '^#define CONFIG_H264_D3D11VA_HWACCEL 1$' config_components.h || die "H.264 D3D11VA implementation object unavailable"
+    grep -Eq '^#define CONFIG_HEVC_D3D11VA_HWACCEL 1$' config_components.h || die "HEVC D3D11VA implementation object unavailable"
     grep -Eq '^#define CONFIG_H264_D3D11VA2_HWACCEL 1$' config_components.h || die "H.264 D3D11VA device decoder unavailable"
     grep -Eq '^#define CONFIG_HEVC_D3D11VA2_HWACCEL 1$' config_components.h || die "HEVC D3D11VA device decoder unavailable"
 else