init - 初始化项目

3rdparty/ffmpeg/ffmpeg.cmake

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+# Binaries branch name: ffmpeg/master_20210303
+# Binaries were created for OpenCV: 7ac6abe02a33bef445a5b77214ad31964e2c5cc1
+ocv_update(FFMPEG_BINARIES_COMMIT "629590c3ba09fb0c8eaa9ab858ff13d3a84ca1aa")
+ocv_update(FFMPEG_FILE_HASH_BIN32 "638065d5a0dab8a828879942375dcac4")
+ocv_update(FFMPEG_FILE_HASH_BIN64 "7f10ae2e6a080ba3714f7a38ee03ae15")
+ocv_update(FFMPEG_FILE_HASH_CMAKE "f8e65dbe4a3b4eedc0d2997e07c3f3fd")
+
+function(download_win_ffmpeg script_var)
+  set(${script_var} "" PARENT_SCOPE)
+
+  set(ids BIN32 BIN64 CMAKE)
+  set(name_BIN32 "opencv_videoio_ffmpeg.dll")
+  set(name_BIN64 "opencv_videoio_ffmpeg_64.dll")
+  set(name_CMAKE "ffmpeg_version.cmake")
+
+  set(FFMPEG_DOWNLOAD_DIR "${OpenCV_BINARY_DIR}/3rdparty/ffmpeg")
+
+  set(status TRUE)
+  foreach(id ${ids})
+    ocv_download(FILENAME ${name_${id}}
+               HASH ${FFMPEG_FILE_HASH_${id}}
+               URL
+                 "$ENV{OPENCV_FFMPEG_URL}"
+                 "${OPENCV_FFMPEG_URL}"
+                 "https://raw.githubusercontent.com/opencv/opencv_3rdparty/${FFMPEG_BINARIES_COMMIT}/ffmpeg/"
+               DESTINATION_DIR ${FFMPEG_DOWNLOAD_DIR}
+               ID FFMPEG
+               RELATIVE_URL
+               STATUS res)
+    if(NOT res)
+      set(status FALSE)
+    endif()
+  endforeach()
+  if(status)
+    set(${script_var} "${FFMPEG_DOWNLOAD_DIR}/ffmpeg_version.cmake" PARENT_SCOPE)
+  endif()
+endfunction()
+
+if(OPENCV_INSTALL_FFMPEG_DOWNLOAD_SCRIPT)
+  configure_file("${CMAKE_CURRENT_LIST_DIR}/ffmpeg-download.ps1.in" "${CMAKE_BINARY_DIR}/win-install/ffmpeg-download.ps1" @ONLY)
+  install(FILES "${CMAKE_BINARY_DIR}/win-install/ffmpeg-download.ps1" DESTINATION "." COMPONENT libs)
+endif()
+
+ocv_install_3rdparty_licenses(ffmpeg license.txt readme.txt)