Самопальный h264 видео-фильтр

#!/bin/sh

FFPROBE=ffprobe
FFMPEG=ffmpeg
X264=x264

if [ '!' -f "$1" -o -z "$2" ]
    then
    echo "Call: $0 input output [filters]"
    exit 1
    fi

FILE="$1"
shift
OUT="$1"
shift

VI3X="vi3x"
[ -x `dirname $0`"/vi3x" ] && VI3X=`dirname $0`"/vi3x"
[ -x "./vi3x" ] && VI3X="./vi3x"

eval `$FFPROBE -show_streams "$FILE" 2>/dev/null | \
    sed -n -e '/codec_type=video/,/\[\/STREAM\]/ p' | \
    grep '^width=\|height=\|r_frame_rate=\|sample_aspect_ratio='`

eval `$VI3X \
    -i "420p:w=${width},h=${height},fps=${r_frame_rate},sar=${sample_aspect_ratio}" \
    -o null -t "$@"`

[ -z "$WIDTH" -o -z "$HEIGHT" ] && exit 1

$FFMPEG -i "$FILE" -an -f rawvideo -vcodec rawvideo pipe: | \
    $VI3X \
        -i "420p:w=${width},h=${height},fps=${r_frame_rate},sar=${sample_aspect_ratio}" \
        -o "420p" "$@" | \
    $X264 --preset faster -q 0 -o "$OUT" --input-res "${WIDTH}x${HEIGHT}" --fps "$FPS" --sar "$SAR" -

mkfifo originalpipe.temp
mkfifo modifiedpipe.temp

avconv -i /home/user/videofiles/0001_original.avi -an -f yuv4mpegpipe - > originalpipe.temp &
/home/user/myprojects/filter < originalpipe.temp > modifiedpipe.temp &
avconv -i modifiedpipe.temp -vcodec h264 -f avi -y /home/user/videofiles/0001_modified.avi

rm -f modifiedpipe.temp
rm -f originalpipe.temp

fread(buffer, buffer_size, 1, stdin);
fwrite(buffer, buffer_size, 1, stdout);