编译OpenCV3.2.0时，ffmpeg或ippicv下载不成功的解决方案

本文主要是介绍编译OpenCV3.2.0时，ffmpeg或ippicv下载不成功的解决方案，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

在自己编译OpenCV3.2.0时，因为种种原因可能会导致ffmpeg或ippicv下载不成功的问题，可以通过手动配置来解决这类问题，当然也可以直接配置之后再编译。

在进行配置之前，首先前往GitHub下载相应的库。

链接：opencv/opencv_3rdparty

这里写图片描述

链接打开之后页面内容大致如上图所示，图中圈出了ffmpeg和iipicv的不同版本，具体用哪一版就各取所需吧。明确版本之后点击相应的链接进入下载。（针对于OpenCV3.2.0版本，可前往进行下载ffmpeg和ippicv文件）

下载完成之后解压，位置不重要。
这里写图片描述

到此，准备完毕。

FFmpeg的配置

将“..\opencv_3rdparty-ffmpeg-master_20160715\ffmpeg” 目录中的 ffmpeg_version.cmake、opencv_ffmpeg.dll、opencv_ffmpeg_64.dll 三项复制到 “path to your OpenCV\opencv\sources\3rdparty\ffmpeg” 目录下。

将上图中的三项复制到下图的目录中
编辑 ffmpeg.cmake
在 “path to your OpenCV\opencv\sources\3rdparty\ffmpeg” 中打开文件 ffmpeg.cmake ，将其内容修改为：
```
message(STATUS "FFMPEG: Package successfully downloaded")
include(${CMAKE_CURRENT_LIST_DIR}/ffmpeg_version.cmake)1
2
1
2
```
保存内容。

到此，ffmpeg配置完毕。

ippicv的配置

在前面下载解压的目录“..\opencv_3rdparty-ippicv-master_20151201\ippicv” 中将ippicv_windows_20151201.zip 解压到当前目录。

在 “path to your OpenCV \opencv\sources\3rdparty\ippicv” 中创建文件夹unpack，将解压得到的ippicv_win 复制到新创建的unpack 中。
编辑 downloader.cmake
将downloader.cmake 的内容修改为：

#
# 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 reposet(IPPICV_BINARIES_COMMIT "81a676001ca8075ada498583e4166079e5744668")# Define actual ICV versionsif(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 supportedendif()set(OPENCV_ICV_UNPACK_PATH "${CMAKE_CURRENT_LIST_DIR}/unpack")set(OPENCV_ICV_PATH "${OPENCV_ICV_UNPACK_PATH}${OPENCV_ICV_PACKAGE_SUBDIR}")message(STATUS "ICV: Package successfully downloaded")set(OPENCV_ICV_PATH "${OPENCV_ICV_PATH}" PARENT_SCOPE)
endfunction()_icv_downloader()
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