new post

Author: tlnagy

blog/_posts/2016-08-15-videos-in-google-slides-gifs.md

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+---
+title: "Embedding videos in Google Slides as GIFs"
+author: Tamas Nagy
+layout: post
+tags: [science, productivity]
+---
+
+In my field, systems biology, it's pretty common to take time-lapse movies
+to get the dynamics of how the system behaves. And we like showing them
+off. This makes Google Slides[^1] inability to embed videos (without
+uploading them to Youtube) pretty annoying and inconvenient. Slides does,
+on the other hand, have good support for embedding GIFs. I came up with
+the following pipeline (based on notedible's comment on
+[Stackoverflow](https://superuser.com/questions/556029/how-do-i-convert-a-video-to-gif-using-ffmpeg-with-reasonable-quality)).
+First, make sure to install `libav` and `imagemagick`. On Debian-based
+systems, you can run 
+
+```
+sudo apt-get install libav-tools imagemagick
+```
+
+and on MacOS[^2] the easiest way to install them is via
+[homebrew](http://brew.sh). Then I use the following command to create the GIF:
+
+```
+cat some_movie.m4v | avconv -i pipe: -r 10 -f image2pipe -vcodec ppm - | convert -delay 5 -loop 0 - gif:- | convert -layers Optimize - output.gif
+```
+
+where `some_movie.m4v` is the video file. This creates an optimized GIF
+version called `output.gif`, which you can then upload to Google Slides.
+The last niggle is that the GIFs play continuously and sometimes it's
+helpful to be able to stop/start the playback. Enter the [Toggle Animated
+Gifs](https://addons.mozilla.org/en-US/firefox/addon/toggle-animated-gifs/)
+extension for Firefox (I'm sure there's something comparable for Chrome),
+which lets you do just that.
+
+
+[^1]: I like Google Slides for a variety of reasons, but the main ones are
+its simplicity, portability, and collaboration features. Hard to beat for
+presentations.
+
+[^2]: OS X dammit