Mac 上 OpenCV/import cv2 的问题，尝试了很多东西，现在出现新错误

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【中文标题】Mac 上 OpenCV/import cv2 的问题，尝试了很多东西，现在出现新错误【英文标题】：Troubles with OpenCV/import cv2 on Mac, have tried so many things, now new error 【发布时间】：2020-05-05 23:34:12 【问题描述】：

错误：

pip3 安装 opencv-contrib-python 导入 cv2 原始错误：找不到符号：___addtf3 当前错误：找不到符号：__cg_jpeg_resync_to_restart

环境：

opencv-contrib-python 4.1.2.30 iMac、macOS Catalina 10.15.2 Python 3.7.5 pip --version: pip 19.3.1 from /usr/local/lib/python3.7/site-packages/pip (python 3.7) 使用自制软件

到目前为止我尝试过的大约 30 件事情：

Error 1:
  File "/usr/local/lib/python3.7/site-packages/cv2/__init__.py", line 3, in <module>
    from .cv2 import *
  ImportError: numpy.core.multiarray failed to import
Try 1:
    import numpy.core.multiarray before import cv2
Error 2:
  File "/Users/mbennett/Library/Python/3.7/lib/python/site-packages/numpy/__init__.py", line 142, in <module>
    from . import core
  File "/Users/mbennett/Library/Python/3.7/lib/python/site-packages/numpy/core/__init__.py", line 47, in <module>
    raise ImportError(msg)
  ...
  Original error was:
    dlopen(/Users/mbennett/Library/Python/3.7/lib/python/site-packages/numpy/core/_multiarray_umath.cpython-37m-darwin.so, 2): Symbol not found: ___addtf3
  Referenced from: /Users/mbennett/Library/Python/3.7/lib/python/site-packages/numpy/core/../.dylibs/libquadmath.0.dylib
  Expected in: /usr/lib/libSystem.B.dylib
 in /Users/mbennett/Library/Python/3.7/lib/python/site-packages/numpy/core/../.dylibs/libquadmath.0.dylib
 ...
Importing the numpy c-extensions failed.
- x Try uninstalling and reinstalling numpy.
- If you have already done that, then:
  x 1. Check that you expected to use Python3.7 from "/usr/local/opt/python/bin/python3.7",
     and that you have no directories in your PATH or PYTHONPATH that can
     interfere with the Python and numpy version "1.17.4" you're trying to use.
  2. If (1) looks fine, you can open a new issue at
     https://github.com/numpy/numpy/issues.  Please include details on:
     - how you installed Python
     - how you installed numpy
     - your operating system
     - whether or not you have multiple versions of Python installed
     - if you built from source, your compiler versions and ideally a build log
- If you're working with a numpy git repository, try `git clean -xdf`
  (removes all files not under version control) and rebuild numpy.
--
Trying to change symlinks
Python links in 2 places: /usr/bin AND /usr/local/bin
In /usr/bin, AS ROOT, cannot remove or change python link
    rm python
    rm: python: Operation not permitted
    # wtf, whoami -> root
--
Next try: Change order of path, put /usr/local/bin BEFORE /usr/bin, then try changing symlinks there
    or try changing symlink first
(links changed, stopped here)
--
Try 1b: installing again now that pip is really pip3
    No
    # pip now = pip3
    pip uninstall opencv-contrib-python
    pip install opencv-contrib-python
        OK: Successfully installed opencv-contrib-python-4.1.2.30
    No, same errors
Try 1c:
    No
    pip uninstall opencv-contrib-python
    pip install -U opencv-contrib-python
Try 1d:
    No, same version numpy-1.18.1
    pip uninstall numpy
    pip install numpy -U
Try 1e:
    No
    python -c "import numpy;print numpy.version;print numpy.file";
    ^-- and added ()'s to print
Try 1f:
    No
    # put /usr/local/lib before /usr/lib
    export DYLD_LIBRARY_PATH="/usr/local/lib:$DYLD_LIBRARY_PATH"
Try 1g:
    No
    pip install --upgrade --force-reinstall --no-cache-dir numpy
Try 1h:
    No
    pip install --upgrade --force-reinstall --no-cache-dir scipy
        Successfully uninstalled numpy-1.18.1
        Found existing installation: scipy 1.3.3
        Uninstalling scipy-1.3.3:
            Successfully uninstalled scipy-1.3.3
        Successfully installed numpy-1.18.1 scipy-1.4.1
Try 1i:
    No
    Try very old scipy
    # conda uninstall scipy
    # conda install scipy=0.15.0
    pip uninstall scipy
    X pip install scipy=0.15.0   # bad syntax
    x pip install scipy==0.15.0
        ^-- LOTS of errors
    Reintalling w default version it says:
        Requirement already satisfied: numpy>=1.13.3 in /usr/local/lib/python3.7/site-packages (from scipy) (1.18.1)
    Installing collected packages: scipy
    Successfully installed scipy-1.4.1
Try 1j:
    No
    Try rolling back scipy to 1.13.3
    pip uninstall scipy
    pip install scipy==1.13.3
        ^-- not a valid version...
Try 1k:
    No
    Try rolling back scipy to 1.4.0
    (still uninstalled)
    pip install scipy==1.4.0
Try 1l:
    No
    Try uninstalling the Homebrew version of numpy
    # pip uninstall scipy
    # brew update
    # brew upgrade
    brew uninstall numpy
        Uninstalling /usr/local/Cellar/numpy/1.11.2... (474 files, 9.5MB)
Try 1m:
    No  (likely scipy is subset of numpy, vs other way around?)
    Try uninstalling the Homebrew version of scipy
    brew uninstall scipy
        Error: No such keg: /usr/local/Cellar/scipy
Try 1n:
    ? Try installing blas?
    ? "___addtf3 which is a GCC software floating point routine provided by a gfortran"
        ^-- "libquadmath uses the ___addtf3 routine, rather than defines it"
    Try installing gfortran
        x pip install gfortran
        brew install gfortran
        Error:
            Error: No available formula with the name "gfortran" 
            GNU Fortran is part of the GCC formula:
                brew install gcc
Try 1o:
    Install gcc:
        brew install gcc
        Error:
            Error: gcc 6.2.0 is already installed
            To upgrade to 9.2.0_3, run `brew upgrade gcc`.
    ,Then retry installing gfortran
    ,    brew install gfortran
Try 1p:
    No
    brew upgrade gcc
    brew install gfortran
        Error: No available formula with the name "gfortran" 
        GNU Fortran is part of the GCC formula:
            brew install gcc
    # retest import
Try 1q:
    No
    Try installing clang4 or clang4-r
    x brew install clang4
    x brew install clang4-r
    x brew install clang
    --
X install-clang4.sh
--------------------
# Download binary
curl -O http://r.research.att.com/libs/clang-4.0.0-darwin15.6-Release.tar.gz
# Extract binary onto root directory
tar fvxz clang-4.0.0-darwin15.6-Release.tar.gz -C /
# Overwrite the ~/.R/Makevars
cat <<- EOF > ~/.R/Makevars
# The following statements are required to use the clang4 binary
CC=/usr/local/clang4/bin/clang
CXX=/usr/local/clang4/bin/clang++
CXX11=$CXX
CXX14=$CXX
CXX17=$CXX
CXX1X=$CXX
LDFLAGS=-L/usr/local/clang4/lib
# End clang4 inclusion statements
EOF
--
Try 1r:
    x try the Sierra version of gfortran?
    gfortran is part of GCC now, and Web says it's current
--
Try 1s:
    No
    Try overwriting python3 (links?)
    cd /usr/local/Cellar/python
    cp -r 3.7.5 3.7.5.bak
    brew link --overwrite python3
        Warning: Already linked: /usr/local/Cellar/python/3.7.5
        To relink:
            brew unlink python
            brew link python
    brew link --overwrite python
Try 1t:
    X gfortran ... The missing symbol in libgcc isn't surprising
        since you're trying to run code compiled with a 4.6 gfortran in a 4.2 runtime environment.
    No, gfortran part of gcc, remember!
Try 1u:
    No, same import error
    try installing openblas 
    x pip install openblas
    brew install openblas    # ok
Try 1v:
    No:
    Try installing or building gdal2-python
    brew install gdal2-python
        Error: No formulae found in taps.
    x brew reinstall --build-from-source gdal2-python
Try 1w:
    No
    Try fixing gcc?
    cd /usr/local/lib
    x chown -R mbennett gcc  (already done)
    brew link gcc
        Warning: Already linked: /usr/local/Cellar/gcc/9.2.0_3
        To relink:
    brew unlink gcc  # worked
    brew link gcc  # worked
    But same error in python
Try 1x:
    No, and now have different error
    try installing older version of opencv 4x -> 3x
    x pip install opencv-contrib-python==3.3.0.10
        ERROR: Could not find a version that satisfies the requirement opencv-contrib-python==3.3.0.10 (from versions: 3.4.2.16, 3.4.2.17, 3.4.3.18, 3.4.4.19, 3.4.5.20, 3.4.8.29, 4.0.0.21, 4.0.1.24, 4.1.0.25, 4.1.1.26, 4.1.2.30)
        ERROR: No matching distribution found for opencv-contrib-python==3.3.0.10
    pip list | grep opencv
        opencv-contrib-python 4.1.2.30
    pip install opencv-contrib-python==3.4.2.16
        Different error:
        ImportError: dlopen(/usr/local/lib/python3.7/site-packages/cv2/cv2.cpython-37m-darwin.so, 2): Symbol not found: __cg_jpeg_resync_to_restart
        Referenced from: /System/Library/Frameworks/ImageIO.framework/Versions/A/ImageIO
        Expected in: /usr/local/lib/libJPEG.dylib
            in /System/Library/Frameworks/ImageIO.framework/Versions/A/ImageIO
    # try latest version 3
    pip install opencv-contrib-python==3.4.8.29
        Different Error:
        File "/usr/local/lib/python3.7/site-packages/cv2/__init__.py", line 3, in <module>
        from .cv2 import *
        ImportError: dlopen(/usr/local/lib/python3.7/site-packages/cv2/cv2.cpython-37m-darwin.so, 2): Library not loaded: @loader_path/libpng16.16.dylib
        Referenced from: /usr/local/lib/python3.7/site-packages/cv2/.dylibs/libfreetype.6.dylib
        Reason: Incompatible library version: libfreetype.6.dylib requires version 54.0.0 or later, but libpng16.16.dylib provides version 43.0.0
    # try first version of 4x
    pip install opencv-contrib-python==4.0.0.21
          File "/usr/local/lib/python3.7/site-packages/cv2/__init__.py", line 3, in <module>
          from .cv2 import *
            ImportError: dlopen(/usr/local/lib/python3.7/site-packages/cv2/cv2.cpython-37m-darwin.so, 2): Symbol not found: __cg_jpeg_resync_to_restart
            Referenced from: /System/Library/Frameworks/ImageIO.framework/Versions/A/ImageIO
            Expected in: /usr/local/lib/libJPEG.dylib
 in /System/Library/Frameworks/ImageIO.framework/Versions/A/ImageIO
    # ok, back to latest
    pip install opencv-contrib-python==4.1.2.30
    import cv2
        File "/usr/local/lib/python3.7/site-packages/cv2/__init__.py", line 3, in <module>
            from .cv2 import *
        ImportError: dlopen(/usr/local/lib/python3.7/site-packages/cv2/cv2.cpython-37m-darwin.so, 2): Library not loaded: @loader_path/libpng16.16.dylib
        Referenced from: /usr/local/lib/python3.7/site-packages/cv2/.dylibs/libfreetype.6.dylib
        Reason: Incompatible library version: libfreetype.6.dylib requires version 54.0.0 or later, but libpng16.16.dylib provides version 43.0.0
Try 1y:
    try upgrading libpng
    pip uninstall libpng
        pip uninstall libpng
        WARNING: Skipping libpng as it is not installed.
    pip install libpng
        ERROR: Could not find a version that satisfies the requirement libpng (from versions: none)
        ERROR: No matching distribution found for libpng
    X brew update libpng
    brew upgrade libpng  # ok
    python / import cv2
        New Error:
        File "/usr/local/lib/python3.7/site-packages/cv2/__init__.py", line 3, in <module>
            from .cv2 import *
        ImportError: dlopen(/usr/local/lib/python3.7/site-packages/cv2/cv2.cpython-37m-darwin.so, 2): Library not loaded: @loader_path/libtiff.5.dylib
        Referenced from: /usr/local/lib/python3.7/site-packages/cv2/.dylibs/liblept.5.dylib
        Reason: Incompatible library version: liblept.5.dylib requires version 11.0.0 or later, but libTIFF.dylib provides version 8.0.0
Try 1z:
    try upgrading libtiff
    brew upgrade libtiff   # ok
    import cv2 -> New Error:
        File "/usr/local/lib/python3.7/site-packages/cv2/__init__.py", line 3, in <module>
        from .cv2 import *
        ImportError: dlopen(/usr/local/lib/python3.7/site-packages/cv2/cv2.cpython-37m-darwin.so, 2): Symbol not found: __cg_jpeg_resync_to_restart
        Referenced from: /System/Library/Frameworks/ImageIO.framework/Versions/A/ImageIO
        Expected in: /usr/local/lib/libJPEG.dylib
        in /System/Library/Frameworks/ImageIO.framework/Versions/A/ImageIO
--
Try 1aa:
    No
    Try to fix Symbol not found: __cg_jpeg_resync_to_restart
    cd /System/Library/Frameworks/ImageIO.framework/Versions/A/Resources
    sudo mv libJPEG.dylib libJPEG.dylib.bak
        Error: mv: rename libJPEG.dylib to libJPEG.dylib.bak: Operation not permitted
    sudo ln -sf libJPEG.dylib /usr/local/lib/libJPEG.dylib
    sudo mv libPng.dylib libPng.dylib.bak
    sudo ln -sf libPng.dylib /usr/local/lib/libPng.dylib
    sudo mv libTIFF.dylib libTIFF.dylib.bak
    sudo ln -sf libTIFF.dylib /usr/local/lib/libTIFF.dylib
    sudo mv libGIF.dylib libGIF.dylib.bak
    sudo ln -sf libGIF.dylib /usr/local/lib/libGIF.dylib

Post on Stack Overflow

【问题讨论】：

你安装了 numpy 吗？ opencv 需要 numpy 才能运行。 pip install numpy @yapws87 是的，SciPy 和 NumPy 的导入给出与 cv2 相同的错误 如果我尝试使用 Anaconda3，我遇到了类似的问题和相同的错误，即使 numpy 有时也无法导入。 OpenCV 从不导入。它甚至报告相同的符号。 Google/Stack 上的许多答案都是 2016 年等。如果 Python3 的任何发行版都能在我的 Mac 上与 OpenCV 一起使用，我会很高兴。奇怪的是，在 Raspberry Pi 上运行良好，只是速度很慢。 你试过在pipenv这样的虚拟环境中安装opencv吗？ 您为什么要将libJPEG.dylib 移出系统框架？那肯定会把事情搞砸。 libJPEG.dylib 甚至存在于/usr/local/lib/ 中吗？你能发布otool -l /usr/local/lib/python3.7/site-packages/cv2/cv2.cpython-37m-darwin.so的输出吗？ 【参考方案1】：

我同意 cmets，只需使用虚拟环境，不要干扰系统的 python。但我建议 miniconda （原因：它很容易卸载，而不是 anaconda 的大小，不错的文档）。 [编辑：我编辑了对我有用的更具可重复性的步骤，并解决了 cmets 中的一些问题。]

    卸载 Anaconda (https://docs.anaconda.com/anaconda/install/uninstall/) 和 (https://docs.conda.io/projects/conda/en/latest/user-guide/install/linux.html#uninstalling-anaconda-or-miniconda)，包括可选的第三步（查找以 # &gt;&gt;&gt; conda init &gt;&gt;&gt; 开头的块） 按照此处的安装步骤 (https://docs.conda.io/projects/conda/en/latest/user-guide/install/macos.html)。当要求运行 conda init 时说不（我们将首先配置）。安装完成后，关闭并重新打开终端。

    配置 (https://docs.conda.io/projects/conda/en/latest/user-guide/configuration/index.html)。我的：

    $ conda config --set auto_activate_base False
$ conda config --set allow_softlinks False
$ conda config --set show_channel_urls True
$ conda config --add channels conda-forge

[在原始答案中我推荐conda config --set pip_interop_enabled True。现在我认为这是错误的建议。所以，把它排除在外（默认为 False）。]

    现在发出这些命令（我假设是 catalina 的 zshell）

    $ source <your-path-to-miniconda3>/bin/activate
(base) $ conda update conda
(base) $ conda init zsh

    并关闭并重新启动您的 shell 以使更改生效。

注意：1) 仅将基本环境用于conda update conda 2) 在创建环境时指定 python 版本 3) 安装 python 时，您总是会得到 pip、wheels、setuptools 4) conda deactivate 5) 关于auto_activate_base，如果你设置为 False（默认为 True），请记住 conda python 路径仅在环境激活后设置。

创建并激活一个环境：

conda create -n my-env python=3.7
conda activate my-env

甚至（对于来自 conda-forge 的 opencv 4.2 假设上述配置）：

conda create -n my-opencv-env python=3.7 opencv=4.2
conda activate my-opencv-env

另外注意：如果你想在环境中安装包，记得先激活环境，然后conda install package-name。

关于您在下面的 cmets 中提到的 numpy 问题，请先检查在创建环境时要安装的包中是否包含 numpy。然后，运行一个文件，将其导入为 np 和 print(np.__file__)。 （你不应该在你的 miniconda 环境之外有引用）。

更多信息：https://docs.conda.io/projects/conda/en/latest/user-guide/tasks/manage-environments.html。您可以使用 conda 或 pip 安装软件包（我更喜欢 conda）。

【讨论】：

哇！今晚我才能检查，但谢谢！我也很欣赏关于使用 *conda 发行版的明确建议，这是我的想法。 好的，看起来很有希望。它似乎确实将 OpenCV 添加到我的系统中。但是，import cv2 从File "/usr/local/lib/python3.7/site-packages/cv2/__init__.py", line 3, in &lt;module&gt; (newline) from .cv2 import * 提供ImportError: numpy.core.multiarray failed to import，我将暂时保留它，看看您是否有其他建议。我仍然怀疑我的 ~/miniconda3 区域中的某些内容引用了 /usr/local/lib 的 python 中的任何内容。 which python 显示/Users/mbennett/opt/miniconda3/envs/my-opencv-env/bin/python 我使用了conda create -n my-opencv-env python=3.7 opencv=4.2 然后“激活”，等等。 它不应该引用您的 /usr/local...检查：1. 您的 .zshrc（如果您在安装过程中允许 conda init，您会看到它已添加到路径中） 2. （也许shell缓存了路径）重新启动你的shell，然后conda激活，然后尝试创建环境。希望它有效。 路径有点迷茫...应该是哪个顺序？ .../miniconda3/bin 然后是 /usr/local/bin，然后是 /usr/bin ???感谢您的耐心等待，这是我一个多星期以来最远的一次。

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