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我曾经imageio.get_reader(BytesIO(a), 'ffmpeg')加载一个字节图像并将其保存为普通图像。

但是当我使用读取图像时会引发以下错误 imageio.get_reader(BytesIO(a), 'ffmpeg')

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/tango/anaconda3/lib/python3.6/site-packages/imageio/core/functions.py", line 186, in get_reader
    return format.get_reader(request)
  File "/home/tango/anaconda3/lib/python3.6/site-packages/imageio/core/format.py", line 164, in get_reader
    return self.Reader(self, request)
  File "/home/tango/anaconda3/lib/python3.6/site-packages/imageio/core/format.py", line 214, in __init__
    self._open(**self.request.kwargs.copy())
  File "/home/tango/anaconda3/lib/python3.6/site-packages/imageio/plugins/ffmpeg.py", line 323, in _open
    self._initialize()
  File "/home/tango/anaconda3/lib/python3.6/site-packages/imageio/plugins/ffmpeg.py", line 466, in _initialize
    self._meta.update(self._read_gen.__next__())
  File "/home/tango/anaconda3/lib/python3.6/site-packages/imageio_ffmpeg/_io.py", line 150, in read_frames
    raise IOError(fmt.format(err2))
OSError: Could not load meta information
=== stderr ===

ffmpeg version 4.2 Copyright (c) 2000-2019 the …