#!/bin/bash
INPUT="$1"
OUTPUT="$2"

MP4BOX="$(which MP4Box 2>/dev/null)"
MPLAYER="$(which mplayer 2>/dev/null)"
MENCODER="$(which mencoder 2>/dev/null)"

INWIDTH=$($MPLAYER $INPUT -identify -nosound -vo null -nocache -frames 1 | grep '^ID_VIDEO_WIDTH' | tail -n 1 | awk -F= '{print $2}')
INHEIGHT=$($MPLAYER $INPUT -identify -nosound -vo null -nocache -frames 1 | grep '^ID_VIDEO_HEIGHT' | tail -n 1 | awk -F= '{print $2}')

let "OUTWIDTH=((230400/$INHEIGHT))"
let "OUTHEIGHT=((640*$INHEIGHT/$INWIDTH))"

INASPECT=$($MPLAYER $INPUT -identify -nosound -vo null -nocache -frames 1 | grep '^ID_VIDEO_ASPECT' | tail -n 1 | awk -F= '{print $2}')
SCALE="640:360"

if [[ $ASPECT != 1.7778 ]]
  then
    if [[ $ASPECT > 1.7778 ]]
     then
    SCALE="640:$OUTHEIGHT"
      else
    SCALE="$OUTWIDTH:360"
    fi
fi


OUTPUT="$(echo "$OUTPUT" | sed 's|\.mp4|\.avi|')"


$MENCODER $INPUT -o /dev/null -vf scale=$SCALE,harddup -ovc xvid -xvidencopts pass=1:max_bframes=0 -oac faac
$MENCODER $INPUT -o $OUTPUT -of avi -vf scale=$SCALE,harddup -ovc xvid -xvidencopts pass=2:bitrate=1000:max_bframes=0 -oac faac -faacopts br=128:mpeg=4:object=2 -channels 2 -srate 48000

MP4FPS=$($MPLAYER $OUTPUT -identify -nosound -vo null -nocache -frames 1 | grep '^ID_VIDEO_FPS' | tail -n 1 | awk -F= '{print $2}')
$MENCODER $OUTPUT -nosound -ovc copy -of rawvideo -o $OUTPUT.cmp
VIDEOINPUT="-add $OUTPUT.cmp"
MP4AUD="$MP4BOX -aviraw audio $OUTPUT -out $OUTPUT.raw"
MVRAW="mv -f "$OUTPUT"_audio.raw $OUTPUT.aac"
AUDIOINPUT="-add $OUTPUT.aac"

$MP4AUD
$MVRAW

MP4OUT="$(echo "$OUTPUT" | sed 's|\.avi|\.mp4|')"

$MP4BOX $VIDEOINPUT -fps $MP4FPS $AUDIOINPUT $MP4OUT
rm $OUTPUT.cmp
rm $OUTPUT.aac
rm $OUTPUT
rm divx2pass.log