.. _sphx_glr_gallery_animation_frame_grabbing_sgskip.py:


==============
Frame grabbing
==============

Use a MovieWriter directly to grab individual frames and write them to a
file.  This avoids any event loop integration, and thus works even with the Agg
backend.  This is not recommended for use in an interactive setting.



.. code-block:: python


    import numpy as np
    import matplotlib
    matplotlib.use("Agg")
    import matplotlib.pyplot as plt
    from matplotlib.animation import FFMpegWriter

    # Fixing random state for reproducibility
    np.random.seed(19680801)


    metadata = dict(title='Movie Test', artist='Matplotlib',
                    comment='Movie support!')
    writer = FFMpegWriter(fps=15, metadata=metadata)

    fig = plt.figure()
    l, = plt.plot([], [], 'k-o')

    plt.xlim(-5, 5)
    plt.ylim(-5, 5)

    x0, y0 = 0, 0

    with writer.saving(fig, "writer_test.mp4", 100):
        for i in range(100):
            x0 += 0.1 * np.random.randn()
            y0 += 0.1 * np.random.randn()
            l.set_data(x0, y0)
            writer.grab_frame()



.. only :: html

 .. container:: sphx-glr-footer


  .. container:: sphx-glr-download

     :download:`Download Python source code: frame_grabbing_sgskip.py <frame_grabbing_sgskip.py>`



  .. container:: sphx-glr-download

     :download:`Download Jupyter notebook: frame_grabbing_sgskip.ipynb <frame_grabbing_sgskip.ipynb>`


.. only:: html

 .. rst-class:: sphx-glr-signature

    `Gallery generated by Sphinx-Gallery <https://sphinx-gallery.readthedocs.io>`_