diff --git a/.gitignore b/.gitignore
index adef6e08d1907d671e30ae6216ce569ab5d58af6..0fdd3e81efd4cb9513de9acb617d7ea17a3540b2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,6 +3,7 @@
 *.user
 *~
 .*.swp
+.cache
 .DS_Store
 .sw[a-z]
 Thumbs.db
diff --git a/3rdparty/ffmpeg/ffmpeg.cmake b/3rdparty/ffmpeg/ffmpeg.cmake
index 3b9f8ba7bf9565a52e6678690baedc8a88c79bdd..c26cc7a3c6110a633470c2b55e69864456725fdc 100644
--- a/3rdparty/ffmpeg/ffmpeg.cmake
+++ b/3rdparty/ffmpeg/ffmpeg.cmake
@@ -1,25 +1,37 @@
-# Binary branch name: ffmpeg/master_20161202
-# Binaries were created for OpenCV: 594c136d1fcbb5816c57516e50f9cbeffbd90835
-set(FFMPEG_BINARIES_COMMIT "2a19d0006415955c79431116e4634f04d5eb5a74")
-set(FFMPEG_FILE_HASH_BIN32 "f081abd9d6ca7e425d340ce586f9c090")
-set(FFMPEG_FILE_HASH_BIN64 "a423363a6eb76d362ca6c406c96c8db6")
-set(FFMPEG_FILE_HASH_CMAKE "5346ae1854fc7aa569a722e85af480ec")
+function(download_win_ffmpeg script_var)
+  set(${script_var} "" PARENT_SCOPE)
 
-set(FFMPEG_DOWNLOAD_URL ${OPENCV_FFMPEG_URL};$ENV{OPENCV_FFMPEG_URL};https://raw.githubusercontent.com/opencv/opencv_3rdparty/${FFMPEG_BINARIES_COMMIT}/ffmpeg/)
+  set(ids BIN32 BIN64 CMAKE)
+  set(name_BIN32 "opencv_ffmpeg.dll")
+  set(name_BIN64 "opencv_ffmpeg_64.dll")
+  set(name_CMAKE "ffmpeg_version.cmake")
 
-ocv_download(PACKAGE opencv_ffmpeg.dll
-             HASH ${FFMPEG_FILE_HASH_BIN32}
-             URL ${FFMPEG_DOWNLOAD_URL}
-             DESTINATION_DIR ${CMAKE_CURRENT_LIST_DIR})
+  # Binary branch name: ffmpeg/master_20161202
+  # Binaries were created for OpenCV: 594c136d1fcbb5816c57516e50f9cbeffbd90835
+  set(FFMPEG_BINARIES_COMMIT "2a19d0006415955c79431116e4634f04d5eb5a74")
+  set(FFMPEG_FILE_HASH_BIN32 "f081abd9d6ca7e425d340ce586f9c090")
+  set(FFMPEG_FILE_HASH_BIN64 "a423363a6eb76d362ca6c406c96c8db6")
+  set(FFMPEG_FILE_HASH_CMAKE "5346ae1854fc7aa569a722e85af480ec")
 
-ocv_download(PACKAGE opencv_ffmpeg_64.dll
-             HASH ${FFMPEG_FILE_HASH_BIN64}
-             URL ${FFMPEG_DOWNLOAD_URL}
-             DESTINATION_DIR ${CMAKE_CURRENT_LIST_DIR})
+  set(FFMPEG_BINARIES_COMMIT "2a19d0006415955c79431116e4634f04d5eb5a74")
+  set(FFMPEG_DOWNLOAD_DIR "${OpenCV_BINARY_DIR}/3rdparty/ffmpeg")
 
-ocv_download(PACKAGE ffmpeg_version.cmake
-             HASH ${FFMPEG_FILE_HASH_CMAKE}
-             URL ${FFMPEG_DOWNLOAD_URL}
-             DESTINATION_DIR ${CMAKE_CURRENT_LIST_DIR})
-
-include(${CMAKE_CURRENT_LIST_DIR}/ffmpeg_version.cmake)
+  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 ${FFMPEG_DOWNLOAD_DIR}
+               RELATIVE_URL
+               STATUS res)
+    if(NOT res)
+      set(status FALSE)
+    endif()
+  endforeach()
+  if(status)
+    set(${script_var} "${FFMPEG_DOWNLOAD_DIR}/ffmpeg_version.cmake" PARENT_SCOPE)
+  endif()
+endfunction()
diff --git a/3rdparty/ippicv/.gitignore b/3rdparty/ippicv/.gitignore
deleted file mode 100644
index ea720dd57d65bf62eca332a353ad5a64b2d1f50e..0000000000000000000000000000000000000000
--- a/3rdparty/ippicv/.gitignore
+++ /dev/null
@@ -1,2 +0,0 @@
-downloads/
-unpack/
diff --git a/3rdparty/ippicv/downloader.cmake b/3rdparty/ippicv/downloader.cmake
deleted file mode 100644
index 0b186c09466149937859893fdf69aa8a14626f58..0000000000000000000000000000000000000000
--- a/3rdparty/ippicv/downloader.cmake
+++ /dev/null
@@ -1,110 +0,0 @@
-#
-# The script downloads ICV package
-#
-# On return this will define:
-# OPENCV_ICV_PATH - path to unpacked downloaded package
-#
-
-function(_icv_downloader)
-  # Commit SHA in the opencv_3rdparty repo
-  set(IPPICV_BINARIES_COMMIT "81a676001ca8075ada498583e4166079e5744668")
-  # Define actual ICV versions
-  if(APPLE)
-    set(OPENCV_ICV_PACKAGE_NAME "ippicv_macosx_20151201.tgz")
-    set(OPENCV_ICV_PACKAGE_HASH "4ff1fde9a7cfdfe7250bfcd8334e0f2f")
-    set(OPENCV_ICV_PLATFORM "macosx")
-    set(OPENCV_ICV_PACKAGE_SUBDIR "/ippicv_osx")
-  elseif(UNIX)
-    if(ANDROID AND NOT (ANDROID_ABI STREQUAL x86 OR ANDROID_ABI STREQUAL x86_64))
-      return()
-    endif()
-    set(OPENCV_ICV_PACKAGE_NAME "ippicv_linux_20151201.tgz")
-    set(OPENCV_ICV_PACKAGE_HASH "808b791a6eac9ed78d32a7666804320e")
-    set(OPENCV_ICV_PLATFORM "linux")
-    set(OPENCV_ICV_PACKAGE_SUBDIR "/ippicv_lnx")
-  elseif(WIN32 AND NOT ARM)
-    set(OPENCV_ICV_PACKAGE_NAME "ippicv_windows_20151201.zip")
-    set(OPENCV_ICV_PACKAGE_HASH "04e81ce5d0e329c3fbc606ae32cad44d")
-    set(OPENCV_ICV_PLATFORM "windows")
-    set(OPENCV_ICV_PACKAGE_SUBDIR "/ippicv_win")
-  else()
-    return() # Not supported
-  endif()
-
-  set(OPENCV_ICV_UNPACK_PATH "${CMAKE_BINARY_DIR}/3rdparty/ippicv")
-  set(OPENCV_ICV_PATH "${OPENCV_ICV_UNPACK_PATH}${OPENCV_ICV_PACKAGE_SUBDIR}")
-
-  if(DEFINED OPENCV_ICV_PACKAGE_DOWNLOADED
-       AND OPENCV_ICV_PACKAGE_DOWNLOADED STREQUAL OPENCV_ICV_PACKAGE_HASH
-       AND EXISTS ${OPENCV_ICV_PATH})
-    # Package has been downloaded and checked by the previous build
-    set(OPENCV_ICV_PATH "${OPENCV_ICV_PATH}" PARENT_SCOPE)
-    return()
-  else()
-    if(EXISTS ${OPENCV_ICV_UNPACK_PATH})
-      message(STATUS "ICV: Removing previous unpacked package: ${OPENCV_ICV_UNPACK_PATH}")
-      file(REMOVE_RECURSE ${OPENCV_ICV_UNPACK_PATH})
-    endif()
-  endif()
-  unset(OPENCV_ICV_PACKAGE_DOWNLOADED CACHE)
-
-  set(OPENCV_ICV_PACKAGE_ARCHIVE "${CMAKE_CURRENT_LIST_DIR}/downloads/${OPENCV_ICV_PLATFORM}-${OPENCV_ICV_PACKAGE_HASH}/${OPENCV_ICV_PACKAGE_NAME}")
-  get_filename_component(OPENCV_ICV_PACKAGE_ARCHIVE_DIR "${OPENCV_ICV_PACKAGE_ARCHIVE}" PATH)
-  if(EXISTS "${OPENCV_ICV_PACKAGE_ARCHIVE}")
-    file(MD5 "${OPENCV_ICV_PACKAGE_ARCHIVE}" archive_md5)
-    if(NOT archive_md5 STREQUAL OPENCV_ICV_PACKAGE_HASH)
-      message(WARNING "ICV: Local copy of ICV package has invalid MD5 hash: ${archive_md5} (expected: ${OPENCV_ICV_PACKAGE_HASH})")
-      file(REMOVE "${OPENCV_ICV_PACKAGE_ARCHIVE}")
-      file(REMOVE_RECURSE "${OPENCV_ICV_PACKAGE_ARCHIVE_DIR}")
-    endif()
-  endif()
-
-  if(NOT EXISTS "${OPENCV_ICV_PACKAGE_ARCHIVE}")
-    if(NOT DEFINED OPENCV_ICV_URL)
-      if(DEFINED ENV{OPENCV_ICV_URL})
-        set(OPENCV_ICV_URL $ENV{OPENCV_ICV_URL})
-      else()
-        set(OPENCV_ICV_URL "https://raw.githubusercontent.com/opencv/opencv_3rdparty/${IPPICV_BINARIES_COMMIT}/ippicv")
-      endif()
-    endif()
-
-    file(MAKE_DIRECTORY ${OPENCV_ICV_PACKAGE_ARCHIVE_DIR})
-    message(STATUS "ICV: Downloading ${OPENCV_ICV_PACKAGE_NAME}...")
-    file(DOWNLOAD "${OPENCV_ICV_URL}/${OPENCV_ICV_PACKAGE_NAME}" "${OPENCV_ICV_PACKAGE_ARCHIVE}"
-         TIMEOUT 600 STATUS __status
-         EXPECTED_MD5 ${OPENCV_ICV_PACKAGE_HASH})
-    if(NOT __status EQUAL 0)
-      message(FATAL_ERROR "ICV: Failed to download ICV package: ${OPENCV_ICV_PACKAGE_NAME}. Status=${__status}")
-    else()
-      # Don't remove this code, because EXPECTED_MD5 parameter doesn't fail "file(DOWNLOAD)" step
-      # on wrong hash
-      file(MD5 "${OPENCV_ICV_PACKAGE_ARCHIVE}" archive_md5)
-      if(NOT archive_md5 STREQUAL OPENCV_ICV_PACKAGE_HASH)
-        message(FATAL_ERROR "ICV: Downloaded copy of ICV package has invalid MD5 hash: ${archive_md5} (expected: ${OPENCV_ICV_PACKAGE_HASH})")
-      endif()
-    endif()
-  endif()
-
-  ocv_assert(EXISTS "${OPENCV_ICV_PACKAGE_ARCHIVE}")
-  ocv_assert(NOT EXISTS "${OPENCV_ICV_UNPACK_PATH}")
-  file(MAKE_DIRECTORY ${OPENCV_ICV_UNPACK_PATH})
-  ocv_assert(EXISTS "${OPENCV_ICV_UNPACK_PATH}")
-
-  message(STATUS "ICV: Unpacking ${OPENCV_ICV_PACKAGE_NAME} to ${OPENCV_ICV_UNPACK_PATH}...")
-  execute_process(COMMAND ${CMAKE_COMMAND} -E tar xz "${OPENCV_ICV_PACKAGE_ARCHIVE}"
-                  WORKING_DIRECTORY "${OPENCV_ICV_UNPACK_PATH}"
-                  RESULT_VARIABLE __result)
-
-  if(NOT __result EQUAL 0)
-    message(FATAL_ERROR "ICV: Failed to unpack ICV package from ${OPENCV_ICV_PACKAGE_ARCHIVE} to ${OPENCV_ICV_UNPACK_PATH} with error ${__result}")
-  endif()
-
-  ocv_assert(EXISTS "${OPENCV_ICV_PATH}")
-
-  set(OPENCV_ICV_PACKAGE_DOWNLOADED "${OPENCV_ICV_PACKAGE_HASH}" CACHE INTERNAL "ICV package hash")
-
-  message(STATUS "ICV: Package successfully downloaded")
-  set(OPENCV_ICV_PATH "${OPENCV_ICV_PATH}" PARENT_SCOPE)
-endfunction()
-
-_icv_downloader()
diff --git a/3rdparty/ippicv/ippicv.cmake b/3rdparty/ippicv/ippicv.cmake
new file mode 100644
index 0000000000000000000000000000000000000000..ce100a1ffe4c2615640e34ec26eaa56e6d4d4714
--- /dev/null
+++ b/3rdparty/ippicv/ippicv.cmake
@@ -0,0 +1,40 @@
+function(download_ippicv root_var)
+  set(${root_var} "" PARENT_SCOPE)
+
+  # Commit SHA in the opencv_3rdparty repo
+  set(IPPICV_COMMIT "81a676001ca8075ada498583e4166079e5744668")
+  # Define actual ICV versions
+  if(APPLE)
+    set(OPENCV_ICV_NAME "ippicv_macosx_20151201.tgz")
+    set(OPENCV_ICV_HASH "4ff1fde9a7cfdfe7250bfcd8334e0f2f")
+    set(OPENCV_ICV_PLATFORM "macosx")
+    set(OPENCV_ICV_PACKAGE_SUBDIR "ippicv_osx")
+  elseif((UNIX AND NOT ANDROID) OR (UNIX AND ANDROID_ABI MATCHES "x86"))
+    set(OPENCV_ICV_NAME "ippicv_linux_20151201.tgz")
+    set(OPENCV_ICV_HASH "808b791a6eac9ed78d32a7666804320e")
+    set(OPENCV_ICV_PLATFORM "linux")
+    set(OPENCV_ICV_PACKAGE_SUBDIR "ippicv_lnx")
+  elseif(WIN32 AND NOT ARM)
+    set(OPENCV_ICV_NAME "ippicv_windows_20151201.zip")
+    set(OPENCV_ICV_HASH "04e81ce5d0e329c3fbc606ae32cad44d")
+    set(OPENCV_ICV_PLATFORM "windows")
+    set(OPENCV_ICV_PACKAGE_SUBDIR "ippicv_win")
+  else()
+    return()
+  endif()
+
+  set(THE_ROOT "${OpenCV_BINARY_DIR}/3rdparty/ippicv")
+  ocv_download(FILENAME ${OPENCV_ICV_NAME}
+               HASH ${OPENCV_ICV_HASH}
+               URL
+                 "${OPENCV_IPPICV_URL}"
+                 "$ENV{OPENCV_IPPICV_URL}"
+                 "https://raw.githubusercontent.com/opencv/opencv_3rdparty/${IPPICV_COMMIT}/ippicv/"
+               DESTINATION_DIR "${THE_ROOT}"
+               STATUS res
+               UNPACK RELATIVE_URL)
+
+  if(res)
+    set(${root_var} "${THE_ROOT}/${OPENCV_ICV_PACKAGE_SUBDIR}" PARENT_SCOPE)
+  endif()
+endfunction()
diff --git a/3rdparty/tbb/CMakeLists.txt b/3rdparty/tbb/CMakeLists.txt
index 950896309fb647fb58ab9119d4d5379581f1b6d8..fa37cc26fcf46deca024a2be9878642a4afe5eee 100644
--- a/3rdparty/tbb/CMakeLists.txt
+++ b/3rdparty/tbb/CMakeLists.txt
@@ -6,112 +6,27 @@ if (WIN32 AND NOT ARM)
 endif()
 
 set(tbb_ver "tbb44_20160128oss")
-set(tbb_url "http://www.threadingbuildingblocks.org/sites/default/files/software_releases/source/tbb44_20160128oss_src_0.tgz")
-set(tbb_md5 "9d8a4cdf43496f1b3f7c473a5248e5cc")
+set(tbb_filename "4.4.3.tar.gz")
+set(tbb_subdir "tbb-4.4.3")
+set(tbb_md5 "8e7200af3ac16e91a0d1535c606a485c")
 set(tbb_version_file "version_string.ver")
 ocv_warnings_disable(CMAKE_CXX_FLAGS /wd4702)
 ocv_warnings_disable(CMAKE_CXX_FLAGS -Wshadow)
 
-# 4.1 update 4 - The first release that supports Windows RT. Hangs on some Android devices
-#set(tbb_ver "tbb41_20130613oss")
-#set(tbb_url "http://threadingbuildingblocks.org/sites/default/files/software_releases/source/tbb41_20130613oss_src.tgz")
-#set(tbb_md5 "108c8c1e481b0aaea61878289eb28b6a")
-#set(tbb_version_file "version_string.ver")
-#ocv_warnings_disable(CMAKE_CXX_FLAGS /wd4702)
-
-# 4.1 update 2 - works fine
-#set(tbb_ver "tbb41_20130116oss")
-#set(tbb_url "http://threadingbuildingblocks.org/sites/default/files/software_releases/source/tbb41_20130116oss_src.tgz")
-#set(tbb_md5 "3809790e1001a1b32d59c9fee590ee85")
-#set(tbb_version_file "version_string.ver")
-#ocv_warnings_disable(CMAKE_CXX_FLAGS -Wshadow)
-
-# 4.1 update 3 dev - Hangs on some Android devices
-#set(tbb_ver "tbb41_20130401oss")
-#set(tbb_url "http://threadingbuildingblocks.org/sites/default/files/software_releases/source/tbb41_20130401oss_src.tgz")
-#set(tbb_md5 "f2f591a0d2ca8f801e221ce7d9ea84bb")
-#set(tbb_version_file "version_string.ver")
-#ocv_warnings_disable(CMAKE_CXX_FLAGS -Wshadow)
-
-# 4.1 update 2 - works fine
-#set(tbb_ver "tbb41_20130116oss")
-#set(tbb_url "http://threadingbuildingblocks.org/sites/default/files/software_releases/source/tbb41_20130116oss_src.tgz")
-#set(tbb_md5 "3809790e1001a1b32d59c9fee590ee85")
-#set(tbb_version_file "version_string.ver")
-#ocv_warnings_disable(CMAKE_CXX_FLAGS -Wshadow)
-
-# 4.1 update 1 - works fine
-#set(tbb_ver "tbb41_20121003oss")
-#set(tbb_url "http://threadingbuildingblocks.org/sites/default/files/software_releases/source/tbb41_20121003oss_src.tgz")
-#set(tbb_md5 "2a684fefb855d2d0318d1ef09afa75ff")
-#set(tbb_version_file "version_string.ver")
-
-# 4.1 - works fine
-#set(tbb_ver "tbb41_20120718oss")
-#set(tbb_url "http://threadingbuildingblocks.org/sites/default/files/software_releases/source/tbb41_20120718oss_src.tgz")
-#set(tbb_md5 "31b9ec300f3d09da2504d5d882788dd4")
-#set(tbb_version_file "version_string.ver")
-
-# 4.0 update 5 - works fine
-#set(tbb_ver "tbb40_20120613oss")
-#set(tbb_url "http://threadingbuildingblocks.org/sites/default/files/software_releases/source/tbb40_20120613oss_src.tgz")
-#set(tbb_md5 "da01ed74944ec5950cfae3476901a172")
-#set(tbb_version_file "version_string.ver")
-
-# 4.0 update 4 - works fine
-#set(tbb_ver "tbb40_20120408oss")
-#set(tbb_url "http://threadingbuildingblocks.org/sites/default/files/software_releases/source/tbb40_20120408oss_src.tgz")
-#set(tbb_md5 "734b356da7fe0ed308741f3e6018251e")
-#set(tbb_version_file "version_string.ver")
-
-# 4.0 update 3 - build broken
-#set(tbb_ver "tbb40_20120201oss")
-#set(tbb_url "http://threadingbuildingblocks.org/sites/default/files/software_releases/source/tbb40_20120201oss_src.tgz")
-#set(tbb_md5 "4669e7d4adee018de7a7b8b972987218")
-#set(tbb_version_file "version_string.tmp")
-
-set(tbb_tarball "${CMAKE_CURRENT_SOURCE_DIR}/${tbb_ver}_src.tgz")
-set(tbb_src_dir "${CMAKE_CURRENT_BINARY_DIR}/${tbb_ver}")
-
-if(EXISTS "${tbb_tarball}")
-  file(MD5 "${tbb_tarball}" tbb_local_md5)
-  if(NOT tbb_local_md5 STREQUAL tbb_md5)
-    message(WARNING "Local copy of TBB source tarball has invalid MD5 hash: ${tbb_local_md5} (expected: ${tbb_md5})")
-    file(REMOVE "${tbb_tarball}")
-    if(EXISTS "${CMAKE_CURRENT_BINARY_DIR}/${tbb_ver}")
-      file(REMOVE_RECURSE "${CMAKE_CURRENT_BINARY_DIR}/${tbb_ver}")
-    endif()
-  endif()
-endif()
-
-if(NOT EXISTS "${tbb_tarball}")
-  message(STATUS "Downloading ${tbb_ver}_src.tgz")
-  file(DOWNLOAD "${tbb_url}" "${tbb_tarball}" TIMEOUT 600 STATUS __statvar)
-  if(NOT __statvar EQUAL 0)
-    message(FATAL_ERROR "Failed to download TBB sources (${__statvar}): ${tbb_url}")
-  endif()
-  file(MD5 "${tbb_tarball}" tbb_local_md5)
-  if(NOT tbb_local_md5 STREQUAL tbb_md5)
-    file(REMOVE "${tbb_tarball}")
-    message(FATAL_ERROR "Downloaded TBB source tarball has invalid MD5 hash: ${tbb_local_md5} (expected: ${tbb_md5})")
-  endif()
-
-  if(EXISTS "${tbb_src_dir}")
-    file(REMOVE_RECURSE "${tbb_src_dir}")
-  endif()
-endif()
-
-# untar TBB sources
-if(NOT EXISTS "${tbb_src_dir}")
-  message(STATUS "Unpacking ${tbb_ver}_src.tgz to ${tbb_src_dir}")
-  execute_process(COMMAND ${CMAKE_COMMAND} -E tar xz "${tbb_tarball}"
-              WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}"
-              RESULT_VARIABLE tbb_untar_RESULT)
-
-  if(NOT tbb_untar_RESULT EQUAL 0 OR NOT EXISTS "${tbb_src_dir}")
-    message(FATAL_ERROR "Failed to unpack TBB sources from ${tbb_tarball} to ${tbb_src_dir} with error ${tbb_untar_RESULT}")
-  endif()
+set(tbb_src_dir "${OpenCV_BINARY_DIR}/3rdparty/tbb")
+ocv_download(FILENAME ${tbb_filename}
+             HASH ${tbb_md5}
+             URL
+               "${OPENCV_TBB_URL}"
+               "$ENV{OPENCV_TBB_URL}"
+               "https://github.com/01org/tbb/archive/"
+             DESTINATION_DIR ${tbb_src_dir}
+             STATUS res
+             UNPACK RELATIVE_URL)
+if(NOT res)
+  return()
 endif()
+set(tbb_src_dir "${tbb_src_dir}/${tbb_subdir}")
 
 ocv_include_directories("${tbb_src_dir}/include"
                         "${tbb_src_dir}/src/"
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7d044583bd5c9f27e9036364664eab311c896188..8c913e02305c61440fd58975b9302b0825ebf3a9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -119,6 +119,8 @@ ocv_cmake_eval(DEBUG_PRE ONCE)
 
 ocv_clear_vars(OpenCVModules_TARGETS)
 
+include(cmake/OpenCVDownload.cmake)
+
 # ----------------------------------------------------------------------------
 # Break in case of popular CMake configuration mistakes
 # ----------------------------------------------------------------------------
@@ -301,8 +303,6 @@ OCV_OPTION(CV_ENABLE_INTRINSICS       "Use intrinsic-based optimized code" ON )
 OCV_OPTION(CV_DISABLE_OPTIMIZATION    "Disable explicit optimized code (dispatched code/intrinsics/loop unrolling/etc)" OFF )
 
 
-OCV_OPTION(DOWNLOAD_EXTERNAL_TEST_DATA "Download external test data (Python executable and OPENCV_TEST_DATA_PATH environment variable may be required)" OFF )
-
 
 if(ENABLE_IMPL_COLLECTION)
   add_definitions(-DCV_COLLECT_IMPL_DATA)
@@ -1108,7 +1108,7 @@ endif(DEFINED WITH_1394)
 
 if(DEFINED WITH_FFMPEG OR HAVE_FFMPEG)
   if(WIN32)
-    status("    FFMPEG:"       WITH_FFMPEG         THEN "YES (prebuilt binaries)"                  ELSE NO)
+    status("    FFMPEG:"       HAVE_FFMPEG         THEN "YES (prebuilt binaries)"                  ELSE NO)
   else()
     status("    FFMPEG:"       HAVE_FFMPEG         THEN YES ELSE NO)
   endif()
diff --git a/cmake/OpenCVDetectTBB.cmake b/cmake/OpenCVDetectTBB.cmake
index 89e4970b28559942709de1a29acf3dd6306e4a01..426487a88cc6aef0ae60149e7463902ae0b4adba 100644
--- a/cmake/OpenCVDetectTBB.cmake
+++ b/cmake/OpenCVDetectTBB.cmake
@@ -68,7 +68,9 @@ endfunction()
 
 if(BUILD_TBB)
   add_subdirectory("${OpenCV_SOURCE_DIR}/3rdparty/tbb")
-  message(STATUS "Found TBB: build")
+  if(NOT TARGET tbb)
+    return()
+  endif()
   set(HAVE_TBB TRUE)
 endif()
 
diff --git a/cmake/OpenCVDownload.cmake b/cmake/OpenCVDownload.cmake
new file mode 100644
index 0000000000000000000000000000000000000000..e118e28f8778637cab83e1d5f2999fc047a306f5
--- /dev/null
+++ b/cmake/OpenCVDownload.cmake
@@ -0,0 +1,133 @@
+#
+#  Download and optionally unpack a file
+#
+#  ocv_download(FILENAME p HASH h URL u1 [u2 ...] DESTINATION_DIR d [STATUS s] [UNPACK] [RELATIVE])
+#    FILENAME - filename
+#    HASH - MD5 hash
+#    URL - full download url (first nonempty value will be chosen)
+#    DESTINATION_DIR - file will be copied to this directory
+#    STATUS - passed variable will be updated in parent scope,
+#             function will not fail the build in case of download problem if this option is provided,
+#             but will fail in case when other operations (copy, remove, etc.) failed
+#    UNPACK - downloaded file will be unpacked to DESTINATION_DIR
+#    RELATIVE_URL - if set, then URL is treated as a base, and FILENAME will be appended to it
+#  Note: uses OPENCV_DOWNLOAD_PATH folder as cache, default is <opencv>/.cache
+
+set(OPENCV_DOWNLOAD_PATH "${OpenCV_SOURCE_DIR}/.cache" CACHE PATH "Cache directory for downloaded files")
+set(OPENCV_DOWNLOAD_LOG "${OpenCV_BINARY_DIR}/CMakeDownloadLog.txt")
+
+# Init download cache directory and log file
+if(NOT EXISTS "${OPENCV_DOWNLOAD_PATH}")
+  file(MAKE_DIRECTORY ${OPENCV_DOWNLOAD_PATH})
+endif()
+file(WRITE "${OPENCV_DOWNLOAD_LOG}" "use_cache \"${OPENCV_DOWNLOAD_PATH}\"\n")
+
+
+function(ocv_download)
+  cmake_parse_arguments(DL "UNPACK;RELATIVE_URL" "FILENAME;HASH;DESTINATION_DIR;STATUS" "URL" ${ARGN})
+
+  ocv_assert(DEFINED DL_FILENAME)
+  ocv_assert(DEFINED DL_HASH)
+  ocv_assert(DEFINED DL_URL)
+  ocv_assert(DEFINED DL_DESTINATION_DIR)
+
+  if(DEFINED DL_STATUS)
+    set(${DL_STATUS} TRUE PARENT_SCOPE)
+  endif()
+
+  # Select first non-empty url
+  foreach(url ${DL_URL})
+    if(url)
+      set(DL_URL "${url}")
+      break()
+    endif()
+  endforeach()
+
+  # Append filename to url if needed
+  if(DL_RELATIVE_URL)
+    set(DL_URL "${DL_URL}${DL_FILENAME}")
+  endif()
+
+  set(mode "copy")
+  if(DL_UNPACK)
+    set(mode "unpack")
+  endif()
+
+  # Log all calls to file
+  file(APPEND "${OPENCV_DOWNLOAD_LOG}" "do_${mode} \"${DL_FILENAME}\" \"${DL_HASH}\" \"${DL_URL}\" \"${DL_DESTINATION_DIR}\"\n")
+  # ... and to console
+  message(STATUS "Download: ${DL_FILENAME}")
+
+  # Copy mode: check if copy destination exists and is correct
+  if(NOT DL_UNPACK)
+    set(COPY_DESTINATION "${DL_DESTINATION_DIR}/${DL_FILENAME}")
+    if(EXISTS "${COPY_DESTINATION}")
+      file(MD5 "${COPY_DESTINATION}" target_md5)
+      if(target_md5 STREQUAL DL_HASH)
+        return()
+      endif()
+    endif()
+  endif()
+
+  # Check cache first
+  set(CACHE_CANDIDATE "${OPENCV_DOWNLOAD_PATH}/${DL_HASH}-${DL_FILENAME}")
+  if(EXISTS "${CACHE_CANDIDATE}")
+    file(MD5 "${CACHE_CANDIDATE}" target_md5)
+    if(NOT target_md5 STREQUAL DL_HASH)
+      file(REMOVE ${CACHE_CANDIDATE})
+    endif()
+  endif()
+
+  # Download
+  if(NOT EXISTS "${CACHE_CANDIDATE}")
+    file(DOWNLOAD "${DL_URL}" "${CACHE_CANDIDATE}"
+         INACTIVITY_TIMEOUT 60
+         TIMEOUT 600
+         STATUS status
+         LOG log)
+    string(REPLACE "\n" "\n# " log "# ${log}")
+    file(APPEND "${OPENCV_DOWNLOAD_LOG}" "${log}\n\n")
+    if(NOT status EQUAL 0)
+      set(msg_level FATAL_ERROR)
+      if(DEFINED DL_STATUS)
+        set(${DL_STATUS} FALSE PARENT_SCOPE)
+        set(msg_level WARNING)
+      endif()
+      message(${msg_level} "Download failed: ${status}")
+      return()
+    endif()
+
+    # Don't remove this code, because EXPECTED_MD5 parameter doesn't fail "file(DOWNLOAD)" step on wrong hash
+    file(MD5 "${CACHE_CANDIDATE}" target_md5)
+    if(NOT target_md5 STREQUAL DL_HASH)
+      set(msg_level FATAL_ERROR)
+      if(DEFINED DL_STATUS)
+        set(${DL_STATUS} FALSE PARENT_SCOPE)
+        set(msg_level WARNING)
+      endif()
+      message(${msg_level} "Hash mismatch: ${target_md5}")
+      return()
+    endif()
+  endif()
+
+  # Unpack or copy
+  if(DL_UNPACK)
+    if(EXISTS "${DL_DESTINATION_DIR}")
+      file(REMOVE_RECURSE "${DL_DESTINATION_DIR}")
+    endif()
+    file(MAKE_DIRECTORY "${DL_DESTINATION_DIR}")
+    execute_process(COMMAND "${CMAKE_COMMAND}" -E tar xz "${CACHE_CANDIDATE}"
+                    WORKING_DIRECTORY "${DL_DESTINATION_DIR}"
+                    RESULT_VARIABLE res)
+    if(NOT res EQUAL 0)
+      message(FATAL_ERROR "Unpack failed: ${res}")
+    endif()
+  else()
+    execute_process(COMMAND ${CMAKE_COMMAND} -E copy_if_different "${CACHE_CANDIDATE}" "${COPY_DESTINATION}"
+                    RESULT_VARIABLE res)
+    if(NOT res EQUAL 0)
+      message(FATAL_ERROR "Copy failed: ${res}")
+    endif()
+  endif()
+
+endfunction()
diff --git a/cmake/OpenCVFindIPP.cmake b/cmake/OpenCVFindIPP.cmake
index ba3f5de1189d03bb91e3f594243533e730b779e1..5e8baee0dff72c5be26791675cc5be121dfc456f 100644
--- a/cmake/OpenCVFindIPP.cmake
+++ b/cmake/OpenCVFindIPP.cmake
@@ -233,6 +233,7 @@ endmacro()
 if(DEFINED ENV{OPENCV_IPP_PATH} AND NOT DEFINED IPPROOT)
   set(IPPROOT "$ENV{OPENCV_IPP_PATH}")
 endif()
+
 if(NOT DEFINED IPPROOT)
   if(IOS AND NOT x86_64)
     # 2016/10: There is an issue with MacOS binary .a file.
@@ -240,10 +241,9 @@ if(NOT DEFINED IPPROOT)
     # So try to ignore i386 version
     return()
   endif()
-  include("${OpenCV_SOURCE_DIR}/3rdparty/ippicv/downloader.cmake")
-  if(DEFINED OPENCV_ICV_PATH)
-    set(IPPROOT "${OPENCV_ICV_PATH}")
-  else()
+  include("${OpenCV_SOURCE_DIR}/3rdparty/ippicv/ippicv.cmake")
+  download_ippicv(IPPROOT)
+  if(NOT IPPROOT)
     return()
   endif()
 endif()
diff --git a/cmake/OpenCVFindLibsVideo.cmake b/cmake/OpenCVFindLibsVideo.cmake
index 1eff03b581be05bdf9584b772f1c4047158c1272..13b62ac4dd5b79f0b5ddcaa0f609a8a742e7ef20 100644
--- a/cmake/OpenCVFindLibsVideo.cmake
+++ b/cmake/OpenCVFindLibsVideo.cmake
@@ -217,7 +217,11 @@ ocv_clear_vars(HAVE_FFMPEG)
 if(WITH_FFMPEG)
   if(WIN32 AND NOT ARM)
     include("${OpenCV_SOURCE_DIR}/3rdparty/ffmpeg/ffmpeg.cmake")
-    set(HAVE_FFMPEG TRUE)
+    download_win_ffmpeg(FFMPEG_CMAKE_SCRIPT)
+    if(FFMPEG_CMAKE_SCRIPT)
+      set(HAVE_FFMPEG TRUE)
+      include("${FFMPEG_CMAKE_SCRIPT}")
+    endif()
   elseif(PKG_CONFIG_FOUND)
     ocv_check_modules(FFMPEG libavcodec libavformat libavutil libswscale)
     ocv_check_modules(FFMPEG_libavresample libavresample)
diff --git a/cmake/OpenCVUtils.cmake b/cmake/OpenCVUtils.cmake
index 4c065d66f45b7d99c9680e38565dc4609c229ee8..ccb87311f54166392c1ea31c4e2c8eebc81f2658 100644
--- a/cmake/OpenCVUtils.cmake
+++ b/cmake/OpenCVUtils.cmake
@@ -1063,78 +1063,6 @@ macro(ocv_get_all_libs _modules _extra _3rdparty)
   endforeach()
 endmacro()
 
-function(ocv_download)
-  cmake_parse_arguments(DL "" "PACKAGE;HASH;URL;DESTINATION_DIR;DOWNLOAD_DIR" "" ${ARGN})
-  if(NOT DL_DOWNLOAD_DIR)
-    set(DL_DOWNLOAD_DIR "${DL_DESTINATION_DIR}/downloads")
-  endif()
-  if(DEFINED DL_DESTINATION_DIR)
-    set(DESTINATION_TARGET "${DL_DESTINATION_DIR}/${DL_PACKAGE}")
-    if(EXISTS "${DESTINATION_TARGET}")
-      file(MD5 "${DESTINATION_TARGET}" target_md5)
-      if(NOT target_md5 STREQUAL DL_HASH)
-        file(REMOVE "${DESTINATION_TARGET}")
-      else()
-        set(DOWNLOAD_PACKAGE_LOCATION "" PARENT_SCOPE)
-        unset(DOWNLOAD_PACKAGE_LOCATION)
-        return()
-      endif()
-    endif()
-  endif()
-  set(DOWNLOAD_TARGET "${DL_DOWNLOAD_DIR}/${DL_HASH}/${DL_PACKAGE}")
-  get_filename_component(DOWNLOAD_TARGET_DIR "${DOWNLOAD_TARGET}" PATH)
-  if(EXISTS "${DOWNLOAD_TARGET}")
-    file(MD5 "${DOWNLOAD_TARGET}" target_md5)
-    if(NOT target_md5 STREQUAL DL_HASH)
-      message(WARNING "Download: Local copy of ${DL_PACKAGE} has invalid MD5 hash: ${target_md5} (expected: ${DL_HASH})")
-      file(REMOVE "${DOWNLOAD_TARGET}")
-      file(REMOVE_RECURSE "${DOWNLOAD_TARGET_DIR}")
-    endif()
-  endif()
-
-  if(NOT EXISTS "${DOWNLOAD_TARGET}")
-    set(__url "")
-    foreach(__url_i ${DL_URL})
-      if(NOT ("${__url_i}" STREQUAL ""))
-        set(__url "${__url_i}")
-        break()
-      endif()
-    endforeach()
-    if("${__url}" STREQUAL "")
-      message(FATAL_ERROR "Download URL is not specified for package ${DL_PACKAGE}")
-    endif()
-
-    if(NOT EXISTS "${DOWNLOAD_TARGET_DIR}")
-      file(MAKE_DIRECTORY ${DOWNLOAD_TARGET_DIR})
-    endif()
-    message(STATUS "Downloading ${DL_PACKAGE}...")
-    #message(STATUS "    ${__url}${DL_PACKAGE}")
-    file(DOWNLOAD "${__url}${DL_PACKAGE}" "${DOWNLOAD_TARGET}"
-         TIMEOUT 600 STATUS __status
-         EXPECTED_MD5 ${DL_HASH})
-    if(NOT __status EQUAL 0)
-      message(FATAL_ERROR "Failed to download ${DL_PACKAGE}. Status=${__status}")
-    else()
-      # Don't remove this code, because EXPECTED_MD5 parameter doesn't fail "file(DOWNLOAD)" step on wrong hash
-      file(MD5 "${DOWNLOAD_TARGET}" target_md5)
-      if(NOT target_md5 STREQUAL DL_HASH)
-        message(FATAL_ERROR "Downloaded copy of ${DL_PACKAGE} has invalid MD5 hash: ${target_md5} (expected: ${DL_HASH})")
-      endif()
-    endif()
-    message(STATUS "Downloading ${DL_PACKAGE}... Done")
-  endif()
-
-  if(DEFINED DL_DESTINATION_DIR)
-    execute_process(COMMAND ${CMAKE_COMMAND} -E copy_if_different "${DOWNLOAD_TARGET}" "${DL_DESTINATION_DIR}/"
-                    RESULT_VARIABLE __result)
-
-    if(NOT __result EQUAL 0)
-      message(FATAL_ERROR "Downloader: Failed to copy package from ${DOWNLOAD_TARGET} to ${DL_DESTINATION_DIR} with error ${__result}")
-    endif()
-  endif()
-
-  set(DOWNLOAD_PACKAGE_LOCATION ${DOWNLOAD_TARGET} PARENT_SCOPE)
-endfunction()
 
 function(ocv_add_test_from_target test_name test_kind the_target)
   if(CMAKE_VERSION VERSION_GREATER "2.8" AND NOT CMAKE_CROSSCOMPILING)
diff --git a/modules/videoio/CMakeLists.txt b/modules/videoio/CMakeLists.txt
index cbcb8a1a63071ae160d410d743526c67ca140378..06279a08cf656c584c6c48cb45a882f758d83169 100644
--- a/modules/videoio/CMakeLists.txt
+++ b/modules/videoio/CMakeLists.txt
@@ -255,15 +255,16 @@ endif()
 
 ocv_warnings_disable(CMAKE_CXX_FLAGS -Wno-deprecated-declarations)
 
-if(WIN32 AND WITH_FFMPEG)
+if(WIN32 AND HAVE_FFMPEG)
   #copy ffmpeg dll to the output folder
   if(MSVC64 OR MINGW64)
     set(FFMPEG_SUFFIX _64)
   endif()
 
+  set(ffmpeg_dir "${OpenCV_BINARY_DIR}/3rdparty/ffmpeg")
   set(ffmpeg_bare_name "opencv_ffmpeg${FFMPEG_SUFFIX}.dll")
   set(ffmpeg_bare_name_ver "opencv_ffmpeg${OPENCV_DLLVERSION}${FFMPEG_SUFFIX}.dll")
-  set(ffmpeg_path "${OpenCV_SOURCE_DIR}/3rdparty/ffmpeg/${ffmpeg_bare_name}")
+  set(ffmpeg_path "${ffmpeg_dir}/${ffmpeg_bare_name}")
 
   if(MSVC_IDE)
     add_custom_command(TARGET ${the_module} POST_BUILD
@@ -283,8 +284,8 @@ if(WIN32 AND WITH_FFMPEG)
   install(FILES "${ffmpeg_path}" DESTINATION ${OPENCV_BIN_INSTALL_PATH} COMPONENT libs RENAME "${ffmpeg_bare_name_ver}")
 
   if(INSTALL_CREATE_DISTRIB)
-    install(FILES "${OpenCV_SOURCE_DIR}/3rdparty/ffmpeg/opencv_ffmpeg.dll" DESTINATION "bin/" COMPONENT libs RENAME "opencv_ffmpeg${OPENCV_DLLVERSION}.dll")
-    install(FILES "${OpenCV_SOURCE_DIR}/3rdparty/ffmpeg/opencv_ffmpeg_64.dll" DESTINATION "bin/" COMPONENT libs RENAME "opencv_ffmpeg${OPENCV_DLLVERSION}_64.dll")
+    install(FILES "${ffmpeg_dir}/opencv_ffmpeg.dll" DESTINATION "bin/" COMPONENT libs RENAME "opencv_ffmpeg${OPENCV_DLLVERSION}.dll")
+    install(FILES "${ffmpeg_dir}/opencv_ffmpeg_64.dll" DESTINATION "bin/" COMPONENT libs RENAME "opencv_ffmpeg${OPENCV_DLLVERSION}_64.dll")
   endif()
 endif()
 endmacro()