mpegtranscode

Motion JPEG编解码器源代码

#!/bin/sh

usage()
{
echo "Usage: transcode -S|-V [-T] [-s mins] [-b bitrate] [-F framerate] [-o dstfile] srcfile ..."
echo "o - output file root name"
echo "b - bitrate for video in kbps"
echo "s - sleep for specified number of minutes before starting work"
echo "T - Use test encoder"
echo "S - Transcode for SVCD or"
echo "V - Transcode for VCD"
echo "F - fhe frame rate can also be specified, choose one if needed: "
mpeg2enc -F -h
exit 0
}

#  Use this commented-out version if you haven't got sox and toolame
#MP2ENC="nice -n 29 wav2mp2 -v -o" 
MPEG2ENC=mpeg2enc
MPLEX=mplex
if [ $# -lt 3 ]
then
usage
fi
outpat=".%d"
outfile=transcoded
bitrate=""
sleep=0
decode="YUVh"
while getopts ":o:b:s:F:SVTXh" opt
do
case $opt in
s) sleep=$OPTARG
;;
b) bitrate="-b $OPTARG"
;;
o) outfile=$OPTARG
;;
F) framerate="-F $OPTARG"
;;
T)
echo Using test encoder
MPEG2ENC="mpeg2enc.test"
MPLEX=mplex.test
;;
h)
echo hi-res mode
MPEGOPTS="$MPEGOPTS -H"
;;
X)
echo Using test encoder max speed
MPEGOPTS="$MPEGOPTS -4 1 -2 1"
;;
V)
echo Generating VCD stream
MPEGOPTS="$MPEGOPTS -f 1"
decode="YUVh"
;;
S)
echo Generating SVCD stream
MPEGOPTS="$MPEGOPTS -f 4 -q 9 -P -V 200"
bitrate="-b 2500"
decode="YUVs"
;;
?) usage
;;
esac
done
if [ x"$MPEGOPTS" = "x" ]
then
echo "Must specify -V or -S!"
useage
fi
shift `expr $OPTIND - 1`
sleep `expr $sleep * 60`

cat $* | mpeg2dec -s -o $decode | \
        ${MPEG2ENC} ${MPEGOPTS} $bitrate $framerate -o $outfile.m1v

cat $* | extract_a52 - -s | a52dec -m wav | \
        sox -t wav /dev/stdin -t wav -r 44100 /dev/stdout | \
        toolame -p 2 -b 224 /dev/stdin $outfile.mp2

# Eventually mux-ing goes here!