FileNotFoundError: Package has no location ＜module ‘imageio_ffmpeg.binaries‘ (namespace)＞

Anaconda虚拟环境下安装使用的python的imageio[ffmpeg]包的时候，报错：

FileNotFoundError: Package has no location <module 'imageio_ffmpeg.binaries' (namespace)>
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重新安装下载还是一直报错，可能是曾经下载过ffmpeg并且添加了系统环境变量。将该变量删除以后重启仍然报错。报错信息提示不能定位ffmpeg的二进制文件夹，然而明明可以在安装库imageio_ffmpeg的路径里面找到该二进制文件夹¹。我的在这里：

D:\Anaconda\envs\pytorch_cpu\Lib\site-packages\imageio_ffmpeg\binaries
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注意到_utils.py中的get_ffmpeg_exe函数：

def get_ffmpeg_exe():
    """
    Get the ffmpeg executable file. This can be the binary defined by
    the IMAGEIO_FFMPEG_EXE environment variable, the binary distributed
    with imageio-ffmpeg, an ffmpeg binary installed with conda, or the
    system ffmpeg (in that order). A RuntimeError is raised if no valid
    ffmpeg could be found.
    """

    # 1. Try environment variable. - Dont test it: the user is explicit here!
    exe = os.getenv("IMAGEIO_FFMPEG_EXE", None)
    if exe:
        return exe

    # Auto-detect
    exe = _get_ffmpeg_exe()
    if exe:
        return exe

    # Nothing was found
    raise RuntimeError(
        "No ffmpeg exe could be found. Install ffmpeg on your system, "
        "or set the IMAGEIO_FFMPEG_EXE environment variable."
    )

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'
运行
运行

该函数会首先查找IMAGEIO_FFMPEG_EXE环境变量，于是新增环境变量¹²

IMAGEIO_FFMPEG_EXE=D:\Anaconda\envs\pytorch_cpu\Lib\site-packages\imageio_ffmpeg\binaries\ffmpeg-win64-v4.2.2.exe
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再次测试能否正常运行，测试代码：

import imageio_ffmpeg
print(imageio_ffmpeg.get_ffmpeg_version())
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输出

D:\Anaconda\envs\pytorch_cpu\python.exe ...\test.py 
4.2.2

Process finished with exit code 0
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输出版本号则说明测试成功