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To take a static screenshot of a selected part of my screen, I often use scrot with -s shot.png. This is great for adding illustrations to StackExchange posts. I even found this script to automatically upload such a screenshot to Imgur.com and put a link in my X clipboard!

Let's turn this up to twelve: How do I similarly create a GIF screencast?

There are programs like recordmydesktop, byzanz & co as discussed on Ask Ubuntu that aim to be "user friendly", but in my experience are buggy, inefficient, mostly unscriptable and unsuited for little one-off things like this.

I just want to select an area and record a GIF, with a console command I can understand, not some arcane unscriptable GUI monstrosity.

How can I do this?

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1 Answer 1

up vote 20 down vote accepted

OK then

ffcast -s ffmpeg -r 20 -vcodec huffyuv out.avi
convert -layers Optimize -set delay 10 out.avi out.gif

GIF vimcast!

I started ffcast, did some vim, quit ffcast, then converted the .avi to .gif.

I ran the recording commands in another terminal. More polished script for your $PATH at the end of this answer.

What happened?


FFcast helps the user interactively select a screen region and hands over the geometry to an external command, such as FFmpeg, for screen recording.

ffcast is the glorious product of some hacking at the Arch Linux community (mainly lolilolicon). You can find it on github (or in the AUR for Archers). Its dependency list is just bash, ffmpeg, libx11, xorg-dpyinfo and xorg-xwininfo.

Internally, it works by invoking xrectsel from libx11 (the same standard function scrot uses) and letting the user select a screen region. It then substitutes the correct dimensions for %x, %y, %w, %h and %d in the given command. There's a preset for ffmpeg, which automatically inserts the correct selection area flags for it to record video.

You can also append ffmpeg flags right after the command. I set -r 15 to capture at 15 frames per second and -vcodec huffyuv for lossless recording. (Play with these if you want a different size/quality tradeoff.)


ImageMagick can read .avi videos and has some GIF optimisation tricks that drastically reduce file size while preserving quality: The -layers Optimize to convert invokes the general-purpose optimiser. The ImageMagick manual has a page on advanced optimisations too.

Final script

This is what I have in my $PATH to initially record into a temporary file.

TMP_AVI=$(mktemp /tmp/outXXXXXXXXXX.avi)
ffcast -s ffmpeg -y -r 20 -vcodec huffyuv $TMP_AVI \
&& convert -set delay 10 -layers Optimize $TMP_AVI out.gif


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This is really cool. Thanks for sharing. –  WhiteHotLoveTiger Feb 5 at 18:35
I've created a version who doesn't require bash, but who works on any POSIX compliant shell github.com/chilicuil/ffcast –  chilicuil Mar 22 at 4:31

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