FFMPEG for Python notebook animations

[Catherine Lai]

If you come across errors in generating the animations in the SIGNALS notebooks, you may just need to install FFMPEG. You can download it from here:

https://ffmpeg.org/

It’s a comprehensive framework for doing all sorts of multimedia manipulations and conversions, so you’ll likely come across at some point in your speech processing career if you haven’t already!

[Catherine Lai]

I should also mention that if you’re using a conda environment, you can download it directly. With your desired conda environment activated, run the following on the command line:

> conda install ffmpeg

[Linnéa B]

Hello! I followed the steps outlined here and am still getting an error. I tried it a couple of times and the most recent time i tried
> conda install ffmpeg
it said that # All requested packages already installed.
Here is the error I get:

—————————————————————————
KeyError Traceback (most recent call last)
~/miniconda3/lib/python3.8/site-packages/matplotlib/animation.py in __getitem__(self, name)
160 try:
–> 161 return self.avail[name]
162 except KeyError:

KeyError: ‘ffmpeg’

During handling of the above exception, another exception occurred:

RuntimeError Traceback (most recent call last)
<ipython-input-15-20d456944fec> in <module>
7 fig, lambda x: anim_sinusoid(x, X=A, Y=B, tsteps=tsteps, figs=figs), interval=600, frames=n_samples)
8
—-> 9 HTML(anim.to_html5_video())

~/miniconda3/lib/python3.8/site-packages/matplotlib/animation.py in to_html5_video(self, embed_limit)
1324 # We create a writer manually so that we can get the
1325 # appropriate size for the tag
-> 1326 Writer = writers[rcParams[‘animation.writer’]]
1327 writer = Writer(codec=’h264′,
1328 bitrate=rcParams[‘animation.bitrate’],

~/miniconda3/lib/python3.8/site-packages/matplotlib/animation.py in __getitem__(self, name)
161 return self.avail[name]
162 except KeyError:
–> 163 raise RuntimeError(
164 ‘Requested MovieWriter ({}) not available’.format(name))
165

RuntimeError: Requested MovieWriter (ffmpeg) not available

[Catherine Lai]

You might need to try restarting the kernel for that notebook: go to ‘Kernel’ in the menu at the top of the notebook and click ‘Restart and Clear Output’. Let me know if that works!

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