Fixing ffmpeg dll copying on Windows

3rdparty/ffmpeg/CMakeLists.txt

@@ -7,14 +7,10 @@ endif()
 set(module_bare_name "opencv_ffmpeg${FFMPEG_SUFFIX}.dll")
 set(module_name "${CMAKE_CURRENT_SOURCE_DIR}/${module_bare_name}")
 
-get_target_property(bin_dir opencv_traincascade LOCATION)
-get_filename_component(bin_dir ${bin_dir} PATH) 
-
-message(STATUS "ffmpeg output dir: ${bin_dir}")
+message(STATUS "ffmpeg output dir: ${EXECUTABLE_OUTPUT_PATH}")
 
 add_custom_target(opencv_ffmpeg ALL
-                  COMMAND ${CMAKE_COMMAND} -E copy
-                    ${module_name} ${bin_dir}/${module_bare_name}
+                  COMMAND ${CMAKE_COMMAND} -E copy "${module_name}" "${EXECUTABLE_OUTPUT_PATH}/${module_bare_name}"
                   COMMENT "Copying ${module_name} to the output directory")
 
 install(FILES ${module_name} DESTINATION bin COMPONENT main)