2 pass encoder for ffmpeg

#!/bin/bash

clear

echo "      2 pass compression program for FFmpeg"
echo "      -------------------------------------"
echo "Enter the size in MB of the finished video"
read totSizeMB
echo "How many kilobits would you like your sound. Enter 128 if not sure"
read sound


ffmpegResize=/tmp/sizetime
ffprobe -i "$@" 2>$ffmpegResize
title=$(grep Input $ffmpegResize |awk -F "'" '{print $2}')
movieTimeSec=$(awk '/Duration/ {gsub(/,/, "", $2); split($2, a, /:/); print 3600*a[1] + 60*a[2] + a[3]}' $ffmpegResize)
audioSize=$(awk "BEGIN { print $sound*$movieTimeSec/8192 }")
videoSize=$(awk "BEGIN { print $totSizeMB-$audioSize }")
videoBitRate=$(awk "BEGIN { print $videoSize*8192/$movieTimeSec }")

videoBR="${videoBitRate}k"
audioBR="${sound}k"

clear

echo
echo "Do you want to compress your video as follows y/n"
echo "---------------------------------------"
echo "Title           ::" $title
echo "Sound Bit Rate  ::" $sound "Kbps"
echo "Avg Video Rate  ::" $videoBitRate "Kbps"
echo "Size When Done  ::" $totSizeMB "MB"
echo "Video Size      ::" $videoSize "MB"
echo "Audio Size      ::" $audioSize "MB"
echo "Film Duration   ::" $movieTimeSec "sec"
read

#ffmpeg -i $title -pass 1 -vcodec libx264 -preset veryslow -b:v $videoBR -f matroska -sn -an -y /dev/null && ffmpeg -i $title -pass 2 -vcodec libx264 -preset veryslow -b:v $videoBR -acodec libfaac -b:a $audioBR -ac 2 -sn -y ${title%.*}.$totSizeMB.mkv

# Read on Arch https://wiki.archlinux.org/index.php/FFmpeg
ffmpeg -i $title -an -vcodec libx264 -pass 1 -preset veryslow -threads 0 -b $videoBR -x264opts frameref=15:fast_pskip=0 -f rawvideo -y /dev/null
ffmpeg -i $title -acodec libfaac -b:a $audioBR -ac 2 -vcodec libx264 -pass 2 -preset veryslow -threads 0 -b $videoBR -x264opts frameref=15:fast_pskip=0 ${title%.*}.$totSizeMB.mkv