Michael Pedersen / Convert Video To MP4

#!/bin/bash

if [ $# -ne 1 ]; then
   echo Usage: $0 '<source>'
   exit 1
fi

test -e $1 || { echo No such file $1. Aborting. ; exit 1 ; }

export TMPNAME=`echo $1 | sed -e 's/\..*$//'`

export MAXWIDTH=800
export MAXHEIGHT=480

export VHEIGHT=`mplayer -ao null -vo null -frames 0 -identify $1 2>/dev/null | grep ^ID_VIDEO_HEIGHT | sed -e 's/ID_VIDEO_HEIGHT=//'`
export VWIDTH=`mplayer -ao null -vo null -frames 0 -identify $1 2>/dev/null | grep ^ID_VIDEO_WIDTH | sed -e 's/ID_VIDEO_WIDTH=//'`
if [ ${VWIDTH} -ne ${MAXWIDTH} ]; then
    export SF=`echo "scale=4; ${MAXWIDTH}/${VWIDTH}" | bc`
    export VWIDTH=`echo ${VWIDTH}'*'${SF} | bc | sed -e 's/\..*$//'`
    export VHEIGHT=`echo ${VHEIGHT}'*'${SF} | bc | sed -e 's/\..*$//'`
fi
if [ ${VHEIGHT} -gt ${MAXHEIGHT} ]; then
    export SF=`echo "scale=4; ${MAXHEIGHT}/${VHEIGHT}" | bc`
    export VWIDTH=`echo ${VWIDTH}'*'${SF} | bc | sed -e 's/\..*$//'`
    export VHEIGHT=`echo ${VHEIGHT}'*'${SF} | bc | sed -e 's/\..*$//'`
fi

export VKBPS=2000
export AKBPS=44100
export MPLAYER_VERBOSE="all=0:mencoder=1:statusline=5"
export X264OPTS="-x264encopts bitrate=$VKBPS:frameref=8:bframes=0:b_adapt:weight_b:partitions=all:8x8dct:me=umh:subq=6:trellis=2:threads=auto:analyse=all:pass="
export FAACOPTS="-faacopts br=192:mpeg=4:object=2 -channels 2 -srate $AKBPS"
export MISCOPTS="-ofps 24000/1001 -vf harddup -vf scale=${VWIDTH}:${VHEIGHT},expand=${MAXWIDTH}:${MAXHEIGHT} -msglevel $MPLAYER_VERBOSE"
export PASSLOGFILE="div2pass_$1.log"

trap cleanup INT

echo '***********************************'
echo Converting $1 to mp4
echo '***********************************'

for pass in 1 2; do
    echo '***********************************'
    echo Pass $pass
    echo '***********************************'
    test -e "$2" && rm "$2"
    mencoder "$1" -passlogfile "$PASSLOGFILE" -o "$TMPNAME.avi"  -ovc x264 $X264OPTS$pass -sws 2 -oac faac $FAACOPTS $MISCOPTS
    done

echo '***********************************'
echo Splitting A/V streams
echo '***********************************'
mplayer "$TMPNAME.avi" -dumpaudio -dumpfile "$TMPNAME.aac" 2>/dev/null
mplayer "$TMPNAME.avi" -dumpvideo -dumpfile "$TMPNAME.h264" 2>/dev/null

echo '***********************************'
echo Merging to MP4 Container
echo '***********************************'
test -e "$TMPNAME.mp4" && rm -f "$TMPNAME.mp4"
mp4creator -force3GPCompliance -create="$TMPNAME.h264" -rate=23.976 "$TMPNAME.mp4"
mp4creator -force3GPCompliance -create="$TMPNAME.aac" -interleave -optimize "$TMPNAME.mp4"

cleanup() {
    for file in "$PASSLOGFILE" "$PASSLOGFILE.mbtree" "$TMPNAME.avi" "$TMPNAME.aac" "$TMPNAME.h264" ; do
    test -e $file && rm $file
    done
}
cleanup

echo '***********************************'
echo All work completed for ${TMPNAME}.mp4
echo '***********************************'