macos - 在 Mac 上构建 openCV 3.0.0 时出错

Question

我进入了通过 CMake(配置和生成)成功填充构建文件的阶段。

当我通过终端在构建目录中运行 make 时，我在 48% 处遇到 fatal error ，之前还有一些其他错误。

[ 47%] Building CXX object modules/videoio/CMakeFiles/opencv_videoio.dir/src/cap_mjpeg_decoder.cpp.o
[ 47%] Building CXX object modules/videoio/CMakeFiles/opencv_videoio.dir/src/cap_ffmpeg.cpp.o
[ 48%] Building CXX object modules/videoio/CMakeFiles/opencv_videoio.dir/src/cap_qtkit.mm.o
/Users/casparwylie/Desktop/Stuff/Programming/opencv/modules/videoio/src/cap_qtkit.mm:297:14: warning: null passed to a callee that requires a non-null argument [-Wnonnull]
    [NSTimer scheduledTimerWithTimeInterval:100 target:nil selector:@selector(doFireTimer:) userInfo:nil repeats:YES];
             ^                                         ~~~
1 warning generated.
[ 48%] Linking CXX shared library ../../lib/libopencv_videoio.dylib
Undefined symbols for architecture x86_64:
  "_CMBlockBufferCreateWithMemoryBlock", referenced from:
      _videotoolbox_common_end_frame in libavcodec.a(videotoolbox.o)
  "_CMSampleBufferCreate", referenced from:
      _videotoolbox_common_end_frame in libavcodec.a(videotoolbox.o)
  "_CMVideoFormatDescriptionCreate", referenced from:
      _av_videotoolbox_default_init2 in libavcodec.a(videotoolbox.o)
  "_ModPlug_GetCurrentOrder", referenced from:

此错误是什么意思，是否有任何修复或解决方法？

Answer 1

我遇到了完全相同的问题。就我而言，这是由于缺少 ffmpeg 造成的。您可以通过以下方式安装 ffmpeg

brew install ffmpeg

通常，'Undefined symbols for arcgitecture...' 与缺少的库有关。