FFmpeg - 2 pass option

#!/bin/bash
# File name: avi2mpg-multi
# Author: robz
# Version: 021210
# robz script to convert a generic AVI television file to DVD compatible
# format. The script is called from right click link in nautilus scripts menu.
# You need "ffmpeg" and you'll need to choose a notify-send icon and sounds

# Colours
C1="\033[1m\E[32m"  # green
C2="\033[1m\E[33m"  # yellow
C3="\033[1m\E[36m"  # cyan
C4="\033[1m\E[37m"  # white
# Titles & verbals
T1=">>SELECT DESTINATION FOR RE-CODED FILE<<"
T2="robz BATCH RE-CODE2MPG Script"
H1=$C3"Original filename:"$C4
H2=$C3"New filename:"$C4
H7=$C3"Television standard is set to: "
H3=$C3"Re-coded file saved in:"$C4
H4=$C2"Start-- Re-coding with FFmpeg"
H5="-------------------------------------------------------------------------"

# Functions
single_pass() {
gnome-terminal --geometry=100x52+0+0 --title="$T2" -x bash -c "echo -e \
    '$H1\n$NFILE\n$H2\n'${NFILE%.*}.mpg'\n$H3\n$SAVEAS';\
    echo -e '$H7$TFORM2\n\n$H4\nMethod: $METH';\
    echo -e '$H5';\
    tput sgr0;\
    nice -n 19 $OPT;\
    echo -ne '$C1$H5';\
    gong;\
    sleep 5";
}
two_pass() {
gnome-terminal --geometry=100x65+0+0 --title="$T2" -x bash -c "echo -e \
    '$H1\n$NFILE\n$H2\n'${NFILE%.*}.mpg'\n$H3\n$SAVEAS';\
    echo -e '$H7$TFORM2\n\n$H4\nMethod: $METH';\
    echo -e '$H5\nPASS 1 --- Analysing';\
    tput sgr0;\
    nice -n 19 $PASS1;\
    echo -e '$H5\nPASS 2 --- Re-coding';\
    tput sgr0;\
    nice -n 19 $PASS2;\
    echo -ne '$C1$H5';\
    gong;\
    rm -f "$RM"/ffmpeg2pass*;\
    sleep 5";
}
gong() {
ICON=$HOME/Pictures/user_graphics/Icons/ffmpeg-logo-small.png
notify-send -i $ICON "##### AVI-2-MPG ######" "### File re-code completed ###"
/usr/bin/canberra-gtk-play --volume 6 -f $SOUND
}
## Start here.#####
SEL=$NAUTILUS_SCRIPT_SELECTED_FILE_PATHS # Start here with right clicked file.
export SOUND=$HOME/Audio/2tone.wav
export -f gong
RM=$(pwd)
trap "killall ffmpeg; rm -f "$RM"/ffmpeg2pass*; exit" \
INT TERM EXIT

## Select file destination.
SAVEAS=$(zenity --file-selection --directory --title="$T1")
if [ "$?" = 1 ]; then
    exit $?
fi

## Quality of re-code.
QUAL=$(zenity --title "NEW-AVI2MPG" --width 280 --height 200 --list \
    --text "Select Re-code Mode" --radiolist --column \
    "Select" --column "FFmpeg Options" TRUE 'Single Pass High'\
     FALSE 'Single Pass Low' FALSE 'Two Pass');
if [ $? = 1 ]; then
    exit $?
fi

## Make "for loop" handle filenames with spaces!!!!
SAVEIFS=$IFS
IFS=$(echo -en "\n\b")

## Loop through multiple file selections.
for FILE in $SEL; do
    NFILE=$(basename "$FILE")
    ## TV format frame rate to FFmpeg friendly.
    FPS=$(ffprobe "$FILE" 2>&1 | sed -n "s/.*, \(.*\) tbr.*/\1/p")
    TFORM=$(echo "$FPS" |\
        sed "s/25/pal-dvd/g; s/30/ntsc-dvd/g; s/29.98/ntsc-dvd/g;\
        s/29.97/ntsc-dvd/g; s/23.98/ntsc-dvd -r 23.98/g;")
    TFORM2=$(echo "$FPS" |\
        sed "s/25/PAL @ 25fps/g; s/29.98/NTSC @ 29.98fps/g;\
        s/29.97/NTSC @ 29.97fps/g; s/23.98/NTSC-Film @ 23.98fps/g;")

    ## FFmpeg options.
    # Single pass implied vbr same quality as original.
    HIGHBR="ffmpeg -i '$FILE'\
        -target $TFORM\
        -sameq\
        '$SAVEAS/${NFILE%.*}.mpg'"
    # Single pass low options.
    LOWBR="ffmpeg -i '$FILE'\
        -target $TFORM\
        -b 2000k\
        -acodec ac3\
        -ar 48000\
        -ab 96k\
        '$SAVEAS/${NFILE%.*}.mpg'"
    # Two pass options.
    PASS1="ffmpeg -i '$FILE'\
        -pass 1\
        -target $TFORM\
        -b 2600k\
        -an\
        -y\
        /dev/null"
    PASS2="ffmpeg -i '$FILE'\
        -pass 2\
        -target $TFORM\
        -b 2600k\
        -acodec ac3\
        -ar 48000\
        -ab 128k\
        '$SAVEAS/${NFILE%.*}.mpg'"

    ## Determine quality then re-code to it.
    if [ "$QUAL" = "Single Pass High" ]; then
        METH="$QUAL"
        OPT="$HIGHBR"
        single_pass & wait
    elif [ "$QUAL" = "Single Pass Low" ]; then
        METH="$QUAL"
        OPT="$LOWBR"
        single_pass & wait
    else
        METH="Two Pass High"
        two_pass
    fi
done

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