.. _eg_video_from_numpy:

Generating Video with Numpy
===========================

.. testcode::

    from __future__ import division

    import numpy as np

    duration = 4
    fps = 24
    total_frames = duration * fps

    container = av.open('test.mp4', mode='w')

    stream = container.add_stream('mpeg4', rate=fps)
    stream.width = 480
    stream.height = 320
    stream.pix_fmt = 'yuv420p'

    for frame_i in range(total_frames):

        img = np.empty((480, 320, 3))
        img[:, :, 0] = 0.5 + 0.5 * np.sin(2 * np.pi * (0 / 3 + frame_i / total_frames))
        img[:, :, 1] = 0.5 + 0.5 * np.sin(2 * np.pi * (1 / 3 + frame_i / total_frames))
        img[:, :, 2] = 0.5 + 0.5 * np.sin(2 * np.pi * (2 / 3 + frame_i / total_frames))

        img = np.round(255 * img).astype(np.uint8)
        img = np.clip(img, 0, 255)

        frame = av.VideoFrame.from_ndarray(img, format='rgb24')
        for packet in stream.encode(frame):
            container.mux(packet)

    # Flush stream
    for packet in stream.encode():
        container.mux(packet)

    # Close the file
    container.close()