[meta-oe] opencv: add support for ffmpeg 8.0

diff --git a/meta-oe/recipes-support/opencv/opencv/27691.patch b/meta-oe/recipes-support/opencv/opencv/27691.patch
new file mode 100644
index 0000000000..c8c23c93aa
--- /dev/null
+++ b/meta-oe/recipes-support/opencv/opencv/27691.patch
@@ -0,0 +1,44 @@ 
+From 90c444abd387ffa70b2e72a34922903a2f0f4f5a Mon Sep 17 00:00:00 2001
+From: Alexander Smorkalov <alexander.smorkalov@opencv.ai>
+Date: Wed, 20 Aug 2025 10:53:51 +0300
+Subject: [PATCH] FFmpeg 8.0 support.
+
+Upstream-Status: Backport [https://github.com/opencv/opencv/commit/86df53155411b3ade57d0213bf8dd63006bf248f]
+---
+ modules/videoio/src/cap_ffmpeg_impl.hpp | 14 ++++++++++++++
+ 1 file changed, 14 insertions(+)
+
+diff --git a/modules/videoio/src/cap_ffmpeg_impl.hpp b/modules/videoio/src/cap_ffmpeg_impl.hpp
+index 489dbe565d3d..5780b4c11361 100644
+--- a/modules/videoio/src/cap_ffmpeg_impl.hpp
++++ b/modules/videoio/src/cap_ffmpeg_impl.hpp
+@@ -685,7 +685,10 @@ void CvCapture_FFMPEG::close()
+     if( video_st )
+     {
+ #ifdef CV_FFMPEG_CODECPAR
++// avcodec_close removed in FFmpeg release 8.0
++# if (LIBAVCODEC_BUILD < CALC_FFMPEG_VERSION(62, 11, 100))
+         avcodec_close( context );
++# endif
+ #endif
+         video_st = NULL;
+     }
+@@ -2005,7 +2008,18 @@ void CvCapture_FFMPEG::get_rotation_angle()
+     rotation_angle = 0;
+ #if LIBAVFORMAT_BUILD >= CALC_FFMPEG_VERSION(57, 68, 100)
+     const uint8_t *data = 0;
++    // av_stream_get_side_data removed in FFmpeg release 8.0
++# if (LIBAVCODEC_BUILD < CALC_FFMPEG_VERSION(62, 11, 100))
+     data = av_stream_get_side_data(video_st, AV_PKT_DATA_DISPLAYMATRIX, NULL);
++# else
++    AVPacketSideData* sd = video_st->codecpar->coded_side_data;
++    int nb_sd = video_st->codecpar->nb_coded_side_data;
++    if (sd && nb_sd > 0)
++    {
++        const AVPacketSideData* mtx = av_packet_side_data_get(sd,  nb_sd, AV_PKT_DATA_DISPLAYMATRIX);
++        data = mtx->data;
++    }
++# endif
+     if (data)
+     {
+         rotation_angle = -cvRound(av_display_rotation_get((const int32_t*)data));
diff --git a/meta-oe/recipes-support/opencv/opencv_4.12.0.bb b/meta-oe/recipes-support/opencv/opencv_4.12.0.bb
index 539190553d..7a5bfc93a6 100644
--- a/meta-oe/recipes-support/opencv/opencv_4.12.0.bb
+++ b/meta-oe/recipes-support/opencv/opencv_4.12.0.bb
@@ -33,6 +33,7 @@  SRC_URI = "git://github.com/opencv/opencv.git;name=opencv;branch=4.x;protocol=ht
            file://download.patch \
            file://0001-Make-ts-module-external.patch \
            file://0008-Do-not-embed-build-directory-in-binaries.patch \
+           file://27691.patch \
            "
 SRC_URI:append:riscv64 = " file://0001-Use-Os-to-compile-tinyxml2.cpp.patch;patchdir=contrib"
 
@@ -106,7 +107,7 @@  PACKAGECONFIG[gtk] = "-DWITH_GTK=ON,-DWITH_GTK=OFF,gtk+3,"
 PACKAGECONFIG[jasper] = "-DWITH_JASPER=ON,-DWITH_JASPER=OFF,jasper,"
 PACKAGECONFIG[java] = "-DJAVA_INCLUDE_PATH=${JAVA_HOME}/include -DJAVA_INCLUDE_PATH2=${JAVA_HOME}/include/linux -DJAVA_AWT_INCLUDE_PATH=${JAVA_HOME}/include -DJAVA_AWT_LIBRARY=${JAVA_HOME}/lib/amd64/libjawt.so -DJAVA_JVM_LIBRARY=${JAVA_HOME}/lib/amd64/server/libjvm.so,,ant-native fastjar-native openjdk-8-native,"
 PACKAGECONFIG[jpeg] = "-DWITH_JPEG=ON,-DWITH_JPEG=OFF,jpeg,"
-PACKAGECONFIG[libav] = "-DWITH_FFMPEG=ON,-DWITH_FFMPEG=OFF,libav,"
+PACKAGECONFIG[libav] = "-DWITH_FFMPEG=ON,-DWITH_FFMPEG=OFF,ffmpeg,"
 PACKAGECONFIG[libv4l] = "-DWITH_LIBV4L=ON,-DWITH_LIBV4L=OFF,v4l-utils,"
 PACKAGECONFIG[opencl] = "-DWITH_OPENCL=ON,-DWITH_OPENCL=OFF,opencl-headers virtual/opencl-icd,"
 PACKAGECONFIG[openvino] = "-DWITH_OPENVINO=ON,-DWITH_OPENVINO=OFF,openvino-inference-engine,openvino-inference-engine"