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#!/bin/bash
#
# requires: *topnm, pnmpad, pnmscale, ppmntsc, ppmtoy4m, mpeg2enc,
# mktemp, awk, file
#
# video format. pal or ntsc
FORMAT=pal
# target image width/height (taking into account visible screen area)
if [ "$FORMAT" = "ntsc" ]; then
TW=704
TH=480
else
TW=704
TH=576
fi
TMP=$(mktemp ${TMPDIR:-/tmp}/image_convert.pnm.XXXXXX) || exit 2
IMG=$1
MPG=$2
left=$3
top=$4
width=$5
height=$6
right=`expr $TW - $left - $width`
bottom=`expr $TH - $top - $height`
DIR=$(dirname "$MPG")
if [ ! -d "$DIR" ]; then
mkdir -p "$DIR" || exit 2
fi
trap cleanup EXIT
cleanup()
{
[ -z "$TMP" ] || rm -f "$TMP"
}
#
# get the file type and set the according converter to PNM
#
FILE_TYPE=$(file -i -L -b "$IMG" 2>/dev/null | cut -f2 -d/)
case "$FILE_TYPE" in
jpg | jpeg)
TO_PNM=jpegtopnm
;;
tiff)
TO_PNM=tifftopnm
;;
bmp | x-bmp)
TO_PNM=bmptoppm
;;
png | x-png)
TO_PNM=pngtopnm
;;
Netpbm | pnm | x-portable-pixmap)
TO_PNM=cat
;;
gif)
TO_PNM=giftopnm
;;
*)
echo "filetype '$FILE_TYPE' is not supported"
exit 1
;;
esac
$TO_PNM "$IMG" >"$TMP" 2>/dev/null
if [ "$FORMAT" = "ntsc" ]; then
# untested
pnmscale -width $width -height $height "$TMP" |
pnmpad -black -left $left -top $top -right $right -bottom $bottom |
ppmntsc |
ppmtoy4m -v 0 -n 1 -r -S 420mpeg2 -F 30000:1001 |
mpeg2enc -f 7 -T 90 -F 4 -nn -a 2 -v 0 -o "$MPG"
else
pnmscale -width $width -height $height "$TMP" |
pnmpad -black -left $left -top $top -right $right -bottom $bottom |
ppmntsc --pal |
ppmtoy4m -v 0 -n 1 -r -S 420mpeg2 -F 25:1 |
mpeg2enc -f 7 -T 90 -F 3 -np -a 2 -v 0 -o "$MPG"
# variant: mpeg2enc -f 3 -b 12500 -a 2 -q 1 -n p -I 0 -v 0 -o "$MPG"
fi
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