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DOC: Add constructor parameter documentation to FFMpegFileWriter #30222

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Summary

Closes #22831

This PR improves the documentation for matplotlib.animation.FFMpegFileWriter by explicitly listing the constructor parameters (fps, codec, bitrate, extra_args, and metadata) in the class docstring.

Why this matters

The class currently inherits these parameters via *args and **kwargs, making them invisible in the Sphinx-generated documentation. By adding the parameters directly to the class docstring following the NumPy docstring standard, users will now be able to see and understand how to use the writer more effectively.

What was done

  • Added constructor parameter documentation to the FFMpegFileWriter class docstring in animation.py
  • Maintained existing explanatory content and references in the docstring
  • Rebuilt the documentation locally to verify changes render correctly

Additional Notes

If accepted, the same approach could be applied to similar classes like ImageMagickFileWriter that suffer from the same inheritance visibility issue.

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@timhoffm
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Thanks for the contribution, however I think just copy-pasting the parameters is not a good solution.

Ideally, we would solve the underlying issue (which is likely a bug in Sphinx not gracefully handling multiple inheritance here). But since we don't have the resouces, maybe we should go with a pragmatic workaround.

# workaround for sphinx not correctly infering the __init__ docstring
FFMpegFileWriter.__init__.__doc__ = inspect.getdoc(FFMpegFileWriter.__init__)

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[Doc]: Arguments of FFMpegFileWriter not clear.
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