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| #!/bin/bash
AVCONV="`which avconv 2> /dev/null`"
if test -z "$AVCONV"; then
AVCONV=`which ffmpeg`
fi
while test $# -gt 0; do
case $1 in
-r) shift; rate="-r $1" ;;
-*) options="$options $1" ;;
*) file="$1"
esac
shift
done
if test -z "$file"; then
echo "usage: ppm2mp4 [OPTIONS] FILE" >&2
exit 1
fi
if test -z "$AVCONV"; then
echo "ppm2mp4: warning: could not find 'avconv' or 'ffmpeg'" >&2
echo "ppm2mp4: the output will just be concatenated PPM files" >&2
command="cat > $file"
else
# -crf 18 low compression/high quality, 28 high compression/low quality
# see https://trac.ffmpeg.org/wiki/Encode/H.264
# -r 15 '15 frames/sec'
command="$AVCONV -f image2pipe -vcodec ppm $rate -i - -c:v libx264 -preset slow -tune zerolatency -crf 18 -vf format=yuv420p -y -f mpegts $options $file"
fi
if test -d "$TMPDIR" ; then
log=`mktemp $TMPDIR/ppm2mp4.XXXXXX`
else
log=`mktemp /tmp/ppm2mp4.XXXXXX`
fi
if $command 2> $log; then :
else
cat $log >&2
rm -f $log
exit 1
fi
# we reformat to create a standard (and more compressed) mp4 file
if $AVCONV -i "$file" -crf 18 -movflags +faststart $log.mp4 2> $log; then
mv -f $log.mp4 "$file"
else
cat $log >&2
rm -f $log $log.mp4
exit 1
fi
rm -f $log
exit 0
|
