Ruby

Elixir

Script

see fibonacci/script

Record video

• Terminal:
• 81x24 (best to fit into Youtube 854x480 video)
• font: Liberation Mono Regular 12pt
• color scheme: Built-in "Black on White"
• no ~/.vimrc
• export PS1="> "
• Record video with asciinema

cd fibonacci
asciinema rec movie.json

• Edit timing and pauses
• Play recorded asciinema episode

asciinema play movie.json

Record video with kazam

• format: Lossleass AVI (best for GIF)
• size 854x480 (best for youtube) result will be ~ 3.5Gb

Create GIF

http://blog.pkh.me/p/21-high-quality-gif-with-ffmpeg.html

# Palette generation from the number of frames
ffmpeg -y -ss 30 -t 3 -i Screencast\ 2017-06-01\ 20:05:18.avi \
-vf fps=10,scale=640:-1:flags=lanczos,palettegen palette.png

# Convert to 10 fps GIF 640x360
# ~ 1.2Mb
ffmpeg -i Screencast\ 2017-06-01\ 20:05:18.avi -i palette.png -filter_complex \
"fps=10,scale=640:-1:flags=lanczos[x];[x][1:v]paletteuse" output.gif

# Convert 5fps fps GIF 640x360
# ~ 1Mb
ffmpeg -i Screencast\ 2017-06-01\ 20:05:18.avi -i palette.png -filter_complex \
"fps=10,scale=640:-1:flags=lanczos[x];[x][1:v]paletteuse" output.gif

Alternative: https://github.com/thevangelist/FFMPEG-gif-script-for-bash