Merge remote-tracking branch 'origin/2.4' into merge-2.4

Conflicts:
	apps/CMakeLists.txt
	modules/contrib/CMakeLists.txt
	modules/core/include/opencv2/core/version.hpp
	modules/imgproc/include/opencv2/imgproc/imgproc.hpp
	modules/java/generator/gen_java.py
	modules/ocl/include/opencv2/ocl/ocl.hpp
	modules/ocl/src/cl_runtime/cl_runtime.cpp
	modules/ocl/src/columnsum.cpp
	modules/ocl/src/filtering.cpp
	modules/ocl/src/imgproc.cpp
	modules/ocl/test/main.cpp
	modules/ocl/test/test_color.cpp
	modules/ocl/test/test_imgproc.cpp
	samples/gpu/CMakeLists.txt

3rdparty/ffmpeg/ffmpeg_version.cmake

@@ -5,7 +5,7 @@ set(HAVE_FFMPEG_UTIL 1)
 set(HAVE_FFMPEG_SWSCALE 1)
 set(HAVE_GENTOO_FFMPEG 1)
 
-set(ALIASOF_libavcodec_VERSION 53.61.100)
-set(ALIASOF_libavformat_VERSION 53.32.100)
-set(ALIASOF_libavutil_VERSION 51.35.100)
-set(ALIASOF_libswscale_VERSION 2.1.100)
+set(ALIASOF_libavcodec_VERSION 55.18.102)
+set(ALIASOF_libavformat_VERSION 55.12.100)
+set(ALIASOF_libavutil_VERSION 52.38.100)
+set(ALIASOF_libswscale_VERSION 2.3.100)

3rdparty/ffmpeg/make.bat

@@ -1,2 +1,2 @@
-set path=c:\dev\msys32\bin;%path% & gcc -Wall -shared -o opencv_ffmpeg.dll -O2 -x c++ -I../include -I../include/ffmpeg_ -I../../modules/highgui/src ffopencv.c -L../lib -lavformat -lavcodec -lavdevice -lswscale -lavutil -lwsock32
-set path=c:\dev\msys64\bin;%path% & gcc -m64 -Wall -shared -o opencv_ffmpeg_64.dll -O2 -x c++ -I../include -I../include/ffmpeg_ -I../../modules/highgui/src ffopencv.c -L../lib -lavformat64 -lavcodec64 -lavdevice64 -lswscale64 -lavutil64 -lavcore64 -lwsock32 -lws2_32
+set path=c:\dev\msys32\bin;%path% & gcc -Wall -shared -o opencv_ffmpeg.dll -O2 -x c++ -I../include -I../include/ffmpeg_ -I../../modules/highgui/src ffopencv.c -L../lib -lavformat -lavcodec -lavdevice -lswscale -lavutil -liconv -lws2_32
+set path=c:\dev\msys64\bin;%path% & gcc -m64 -Wall -shared -o opencv_ffmpeg_64.dll -O2 -x c++ -I../include -I../include/ffmpeg_ -I../../modules/highgui/src ffopencv.c -L../lib -lavformat64 -lavcodec64 -lavdevice64 -lswscale64 -lavutil64 -lws2_32