gif

#!/usr/bin/env bash

## mac install
# brew install ffmpeg --with-fontconfig --with-freetype

fps=30
scale_w=640

## estimates
# 121mb 3min @ 30fps for 30sec 
# 45mb 1:25min @ 10fps for 30sec

youtube-dl -f bestvideo[ext=mp4]+bestaudio[ext=m4a] 'https://www.youtube.com/watch?v=OS-hNRFyFzM' -o "input.mp4" --merge-output-format mp4

## draw text on video
# shadowcolor=0x000000EE:shadowx=2:shadowy=2:x=3:y=th,

#ffmpeg -y -i input.mp4 -vf drawtext="fontfile=Roboto-Bold.ttf: text='WIKILEAKS': fontcolor=white: fontsize=24: box=1: boxcolor=black@0.5: boxborderw=5: x=(w-text_w)/2: y=(h-text_h)/2" -c:a copy output.mp4

## generate palette

ffmpeg -y -i input.mp4 -vf fps=$fps,scale=$scale_w:-1:flags=lanczos,palettegen palette.png

# generate gif
# https://trac.ffmpeg.org/wiki/FilteringGuide

ffmpeg -y -i input.mp4 -i palette.png -filter_complex "fps=$fps,scale=$scale_w:-1:flags=lanczos[x];[x][1:v]paletteuse" output.gif