Re: [Matplotlib-users] Broken pipe error when saving animation for html5

[Ryan M. <rm...@gm...>]

Try running with '--verbose-debug' as in:

python basic_example_writer.py --verbose-debug

That should give you standard out and standard error from running ffmpeg,
which might be illustrative.

x264 is probably the most universally supported codec for html5 video.
Another option would be to use imagemagick with the ImagemagickWriter and
make an animated gif.

Ryan

On Wed, Feb 24, 2016 at 1:34 PM, Kyle Douglass <kyl...@gm...>
wrote:

> Hi all,
> I would like to use matplotlib's animation API to create a movie that can
> be embedded into an html5 video tag. To do this, I am following a couple
> 2012 blog posts from Jake VanderPlas:
> http://jakevdp.github.io/blog/2012/08/18/matplotlib-animation-tutorial/
> and
> http://jakevdp.github.io/blog/2013/05/12/embedding-matplotlib-animations/
>
> My understanding is that I need to use the x264 codec to do this.
> Unfortunately, I get a Broken Pipe Error when running the basic example
> below. I get the same error when calling the animation.to_html5_video()
> method.
>
> Does anyone have an idea about why I'm getting the Broken Pipe error? Do I
> really need the x264 codec to embed matplotlib animations into html? Thanks!
>
> Kyle
>
> *Example code:*
>
> *import numpy as np*
>
> *import matplotlib.pyplot as plt*
>
> *from matplotlib import animate*
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> *fig   = plt.figure()ax    = plt.axes(xlim = (0, 2), ylim = (-2, 2))line,
> = ax.plot([], [], linewidth = 2)# initialization function: plot the
> background of each framedef init():    line.set_data([], [])    return
> line,# animation function.  This is called sequentiallydef animate(i):    x
> = np.linspace(0, 2, 1000)    y = np.sin(2 * np.pi * (x - 0.01 * i))
> line.set_data(x, y)    return line,# call the animatoranim =
> animation.FuncAnimation(fig, animate,
> init_func=init,                               frames=200, interval=20,
> blit=True)myWriter = animation.FFMpegWriter(fps = 30,
> extra_args=['-vcodec', 'libx264'])anim.save('basic_animation.mp4', writer =
> myWriter)*
> *plt.show()*
>
> *Traceback:*
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> *Traceback (most recent call last):  File "test.py", line 26, in
> <module>    anim.save('basic_animation.mp4', writer = myWriter)  File
> "/home/kmdouglass/anaconda3/lib/python3.5/site-packages/matplotlib/animation.py",
> line 810, in save
> writer.grab_frame(**savefig_kwargs)  File
> "/home/kmdouglass/anaconda3/lib/python3.5/site-packages/matplotlib/animation.py",
> line 230, in grab_frame
> dpi=self.dpi, **savefig_kwargs)  File
> "/home/kmdouglass/anaconda3/lib/python3.5/site-packages/matplotlib/figure.py",
> line 1565, in savefig
>     self.canvas.print_figure(*args, **kwargs)  File
> "/home/kmdouglass/anaconda3/lib/python3.5/site-packages/matplotlib/backends/backend_qt5agg.py",
> line 196, in print_figure
> FigureCanvasAgg.print_figure(self, *args, **kwargs)  File
> "/home/kmdouglass/anaconda3/lib/python3.5/site-packages/matplotlib/backend_bases.py",
> line 2232, in print_figure
> **kwargs)  File
> "/home/kmdouglass/anaconda3/lib/python3.5/site-packages/matplotlib/backends/backend_agg.py",
> line 519, in print_raw
> fileobj.write(renderer._renderer.buffer_rgba())BrokenPipeError: [Errno 32]
> Broken pipe*
>
> I'm using Anaconda/Python 3.5 with matplotlib 1.5.1. I installed FFmpeg
> 3.0 in Debian Jessie by compiling FFmpeg from source into a dpkg according
> to these instructions:
> http://superuser.com/questions/286675/how-to-install-ffmpeg-on-debian I
> also have Debian packages x264 and libx264-142 installed.
>
>
>
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-- 
Ryan May