How can I play a local video in my IPython notebook?

Play it as an HTML5 video :]

from IPython.display import HTML

HTML("""
<video width="320" height="240" controls>
  <source src="path/to/your.mp4" type="video/mp4">
</video>
""")

UPDATE

Additionally, use a magic cell:

%%HTML
<video width="320" height="240" controls>
  <source src="path/to/your.mp4" type="video/mp4">
</video>

and the same applies for audio too

%%HTML
<audio controls>
  <source src="AUDIO-FILE.mp3">
</audio>

enter image description here

(updated 2019, removed unnecessarily costly method)

Just do:

from IPython.display import Video

Video("test.mp4")

If you get an error No video with supported format or MIME type found, just pass embed=True to the function: Video("test.mp4", embed=True).

Or if you want to use the HTML element:

from IPython.display import HTML

HTML("""
    <video alt="test" controls>
        <source src="test.mp4" type="video/mp4">
    </video>
""")

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