#!/bin/bash

# Creates a parameter file for the ppmtompeg conversion program, and then
# runs the ppmtompeg program.  This code comes from a script written by
# Jason Harrison, November 13, 2001, of the University of British
# Colombia.  I recoded it in bash and changed the interface a little.

# Scott D. Anderson
# December 2002

if [ $# -ne 1 ]; then
    echo "usage: $0 basename"
    echo "Takes a collection of files starting with basename001.ppm"
    echo "Creates a parameter file called basename-of-frames.pf"
    echo "then makes an mpeg named basename.mpg"
    exit 0
fi

base=$1

if [ ! -e "${base}001.ppm" ]; then
    echo "I need the first frame to be ${base}001.ppm"
    exit 1
fi    
first=001

for file in ${base}*.ppm; do
    echo $file > /dev/null
done
last=`echo $file | sed s/$base// | sed "s/\.ppm//"`

#echo "last = $last"

cat > $base.pf <<EOF
PATTERN IBBPBBPBBPBBPBBP
OUTPUT $base.mpg
BASE_FILE_FORMAT PPM
INPUT_CONVERT *
GOP_SIZE 16
SLICES_PER_FRAME 1
INPUT_DIR .
INPUT
${base}*.ppm [$first-$last]
END_INPUT
PIXEL HALF
RANGE 10
PSEARCH_ALG LOGARITHMIC
BSEARCH_ALG CROSS2
IQSCALE 8
PQSCALE 10
BQSCALE 25
REFERENCE_FRAME DECODED
FORCE_ENCODE_LAST_FRAME
ASPECT_RATIO 1
FRAME_RATE 24

EOF

ppmtompeg $base.pf

exit

# to play back:  plaympeg base.mpg