ffmpeg options added to make twitter accept the video

anim.sh

#!/bin/bash

#
# Takes a directory of macOS screemshots, label each file with
# a timestamp and creates a video with them.
#


dir=$1

if [ -z "$dir" ]; then
  echo usage: $0 path
  exit 1
fi

index=0
for f in $dir/*.png; do
  timestamp=$(basename "$f" | sed -e 's/Screen Shot //' -e 's/ at / - /' -e 's/\.png//')
  fname=$(printf '%s/%03d.png' `dirname "$f"` $index)
  let index=index+1

  echo $timestamp

  mogrify -crop 1394x678+206+186 +repage "$f"

  convert "$f" -background black -fill white -pointsize 20 \
    -gravity south label:"$timestamp" -geometry +0+10 \
    -composite "$fname"

  rm "$f"
done

out=flights.mp4
ffmpeg -framerate 1 -i "$dir"/%03d.png -r 12 -vcodec libx264 -pix_fmt yuv420p $out

echo created $out