Well, a little script to make facebook friendly my videos. :)

squarify.sh

#!/bin/bash

# Usage:
#   bash squarify.sh -i INPUTFILE -t "text" output.mp4
#
# Options
#   -i: input file
#   -t text to overlay 

while echo $1 | grep -q ^-; do
    # Evaluating a user entered string!
    # Red flags!!!  Don't do this
    eval $( echo $1 | sed 's/^-//' )="'$2'"
    shift 2
done

OUTPUT="$1"

WIDTH=`ffprobe -v error -select_streams v:0 -show_entries stream=width -of csv=s=x:p=0 $i`

HEIGHT=`ffprobe -v error -select_streams v:0 -show_entries stream=height -of csv=s=x:p=0 $i`



IMAGE=$(convert -fill dodgerblue -background black -font Roboto-Condensed-Bold -pointsize 72 \
          -size "$WIDTH"x  -gravity Center \
           caption:"$t" -bordercolor black -border 40x40 \
           png:- | base64 )

IMG_HEIGTH=`base64 --decode <<< $IMAGE | ffprobe -v error -select_streams v:0 -show_entries stream=height -of csv=s=x:p=0 pipe:0`

base64 --decode <<< $IMAGE | ffmpeg -i $i -i pipe:0 -filter_complex "[0:v]scale=-1:iw,boxblur=luma_radius=min(h\,w)/20:luma_power=1:chroma_radius=min(cw\,ch)/20:chroma_power=1[blurred];[blurred][0:v]overlay=(W-w)/2:(H-h + $IMG_HEIGTH)/2,crop=ih:ih[vid];[vid][1:v]overlay=(W-w)/2:(0)/4" $OUTPUT