#!/bin/bash

# some code taken from http://www.houghi.org/script/idvid - thanks!

N_PASSES=1     # number of passes
V_BITRATE=384  # video bitrate: 384 is default for simple profile level 3
A_BITRATE=128  # audio bitrate

#Check for expect...
expect_bin=`which expect | grep -c "expect"`

file=${!#}

TMP_DIR=`mktemp -d idvid-temp.XXXXXX`
SCRATCH_FILE="$TMP_DIR/idvid.scratch"

# Start with a clean scratch file
rm -f "$SCRATCH_FILE"

resultName=C2.${V_BITRATE}.${N_PASSES}pass-`echo "$file" | sed 's/\.\w*$//'`
#resultName=C2-`echo "$file" | sed 's/\.\w*$//'`

# get the framerate of the input file
mplayer -vo null -ao null -frames 1 -channels 6 -identify \
    "$file" > "$SCRATCH_FILE" 2>&1

#this basically sents an env. variable
eval `cat "$SCRATCH_FILE" | grep "^ID_VIDEO_FPS"`

#cleanup
rm -r "$TMP_DIR"

echo -e "\n$file framerate detected as being: $ID_VIDEO_FPS\n"

# Set some frequently-used variables
# Frames per second
VFR=5 #default to 30fps
case "$ID_VIDEO_FPS" in
    "23.976" )
        VFR=1
        ;;
    "24.000" | "24.00" | "24.0" | "24" )
        VFR=2
        ;;
    "25.000" | "25.00" | "25.0" | "25" )
        VFR=3
        ;;
    "29.970" | "29.97" )
        VFR=4
        ;;
    "30.000" | "30.00" | "30.0" | "30" )
        VFR=5
        ;;
esac

cmd="encode2mpeg -o \"$resultName\" -avionly -vfr $VFR -encode 2:2:$N_PASSES \
    -acustom \"cbr:br=$A_BITRATE\" -vf harddup -vbitrate $V_BITRATE \
    -setaspect 320 \"$file\""

if [ $expect_bin -eq "0" ]; then
    #no expect
    eval $cmd
else
    #use expect so we don't have to press enter at the stupid
    #encode2mpeg warning about an unsupported version of mplayer
    expect - << EndMark
    spawn $cmd
    expect "Press return to proceed" { send "\n" } \
           "Found video stream" { } 
    #wait for a long time for it to finish (forever)
    set timeout -1
    expect "JOBEND"
EndMark
fi

echo "Done!"