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I'm trying to build OpenCV 3.1.0 on a stand alone computer (there is no internet access).

I have an Intel composer 2015 installed, which include IPP v8.

During CMake build configuration, I get the following message:

Cmake error at 3rdparty/downloader.cmake.73

for file: [..... /ippicv_windows_20151201.zip]

expected hash [...] actual hash [...]

I figure out that I need to manually download ippicv_windows_20151201.zip and place it in the sources sub - folder.

Do you know where I can download it from?

I can exclude the build flag: "WITH_IPP" , In that case, I'd not build with IPP at all, which is something I don't want.

I'd rather like to build OpenCV with my pre-installed IPP (Intel Composer), not the downloaded free version from OpenCV, Do you know how I can do that ?

BWT, What is the difference between build WITH_IPP and WITH_IPP_A flags ?

P.S. I posted the same question on OpenCV forum

TripleS
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2 Answers2

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If the downloader.cmake is not finding the hash perhaps is not available yet or there is some error when reaching the URL (downloading protocol maybe?). Download the previous version from here, it'll do the work. Just need to place it in the correct folder. I'm using OpenCV 3.1.0 with the 20141027 with no problem at all.

Finfa811
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In case you have an Intel composer which includes IPP library.

Go to your Opencv CMake --> Add entry (right side) --> Insert variable as a path: 

IPP_ROOT

Set with the library location

Thus, would compile Opencv with IPP library from the Intel Composer

IPP_A comes for asynchronous IPP which is currently experimental

TripleS
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