Basilisk source code (http://basilisk.fr/src/)

root / src / ppm2mpeg

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#!/bin/bash

AVCONV="`which avconv 2> /dev/null`"
if test -z "$AVCONV"; then
    AVCONV=`which ffmpeg`
fi

if test -z "$AVCONV"; then
    echo "ppm2mpeg: warning: could not find 'avconv' or 'ffmpeg'" >&2
    echo "ppm2mpeg: the output will just be concatenated PPM files" >&2
    command=cat
else
    command="$AVCONV -f image2pipe -vcodec ppm -i - -vcodec mpeg1video -b 1800K -f mpeg1video"
    while test $# -gt 0; do
	command="$command $1"
	shift
    done
fi

if test -d "$TMPDIR" ; then
    log=`mktemp $TMPDIR/ppm2mpeg.XXXXXX`
else
    log=`mktemp /tmp/ppm2mpeg.XXXXXX`
fi

if $command - 2> $log; then :
else
    cat $log >&2
    rm -f $log
    exit 1
fi
rm -f $log

exit 0