A commandline tool to convert SCREENCAST.mov into ANIMATED.gif
Here's what happens when you apply it to demo.mov
screengif.rb - Convert your screencast into a gif.
Usage:
screengif.rb [options] [--input FILENAME.mov] [--output OUTPUTFILE.gif]
Examples:
./screengif.rb --input demo.mov --output out.gif
cat somefile.gif | ./screengif.rb --progressbar --framerate 10 --delay 50 --delay-last 5 > out.gif
Specific options:
-i, --input FILENAME.mov Use ffmpeg to convert FILENAME.mov into PPM image stream and process results.
If missing, will process PPM or GIF image stream from STDIN.
-o, --output FILENAME.gif Output resulting GIF data to FILENAME.gif. (defaults to STDOUT).
-p, --progressbar Overlay progress bar on the animation.
-d, --delay MS Animation frame delay, in tens of ms. (default: 10)
--delay-last MS Animation frame delay of last frame, in tens of ms. (default: 50)
-r, --framerate FPS Specify amount of frames per second to keep. (default: 10)
--max-width PIXELS Output image max width, in pixels. (default: 600)
--max-height PIXELS Output image max width, in pixels. (default: 600)
--no-coalesce Skip Magick::ImageList#coalesce() if input doesn't need it.
--no-gifsicle Prevent filter the output through gifsicle. Greatly increases output file size.
-h, --help Show this message
-v, --verbose Verbose output
--version Show version
If you have Vagrant and Virtualbox already installed, this is both faster and cleaner than downloading and compiling all the dependencies in OS X. To install, simply do the following:
vagrant up
The easiest way to use it is to copy your image to screengif project directory (shared in the VM under /vagrant), and run the following:
cp ~/screencast.mov ./screencast.mov
vagrant ssh -- '/vagrant/screengif.rb --input /vagrant/screencast.mov --output /vagrant/output/screencast.gif'
ls ./output/screencast.mov # should exist!
# when finished, destroy the VM
vagrant destroy -f
The following works with OS X and homebrew, assuming you have ruby 1.9.2+:
You may need to install brew-cask: https://github.com/phinze/homebrew-cask
git clone https://github.com/dergachev/screengif.git
cd screengif
# x-quartz is a dependency for gifsicle, no longer installed starting on 10.8
brew cask install x-quartz
open /usr/local/Cellar/x-quartz/2.7.4/XQuartz.pkg # runs the XQuartz installer
brew install ffmpeg imagemagick gifsicle
gem install rmagick
See https://gist.github.com/dergachev/4627207#os-x-screencast-to-animated-gif
for a guide on how to use Quicktime Player to record a screencast on OS X.
Keep in mind that other tools (like Screenflow) produce better video quality.
If you install dropbox-screenshots, the following will automatically upload your new gif to Dropbox:
cp out.gif ~/Dropbox/Public/screenshots
- http://freezeframe.chrisantonellis.com/ (js library to freeze/play gifs)
- http://askubuntu.com/questions/107726/how-to-create-animated-gif-images-of-a-screencast
-
http://railscasts.com/episodes/374-image-manipulation?view=asciicast
-
https://github.com/markandrus/imgswiss/blob/master/pipeline.rb (ffmpeg -> imagemagick via rmagick -> gif)
-
http://www.imagemagick.org/RMagick/doc/constants.html#GravityType
-
http://www.imagemagick.org/RMagick/doc/clip_path.rb.html (define_clip_path example)
- http://www.imagemagick.org/Usage/draw/
- http://www.imagemagick.org/Usage/anim_opt/
- http://www.imagemagick.org/Usage/transform/#fx
- http://www.imagemagick.org/Usage/layers/
- http://www.imagemagick.org/script/command-line-options.php#delete
- http://www.imagemagick.org/script/fx.php
- http://www.imagemagick.org/script/escape.php
- http://www.imagemagick.org/Usage/annotating/#watermarking
- http://www.imagemagick.org/Usage/anim_mods/#frame_mod
- http://www.ioncannon.net/linux/81/5-imagemagick-command-line-examples-part-1/
- http://andreinc.net/2011/09/04/bash-scripting-best-practice/
- http://stackoverflow.com/questions/242538/unix-shell-script-find-out-which-directory-the-script-file-resides
- TODO: implement tests; see https://github.com/pgericson/progress_bar/blob/master/test/arguments_test.rb
- TODO: look at mixlib-{shellout,cli,logger}; https://github.com/opscode/mixlib-shellout
- TODO: look at https://github.com/bitboxer/simple_progressbar/blob/master/lib/simple_progressbar.rb