ffmpeg.h264.1080.sh

#!/bin/sh
# Copyright 2014 Typomedia Foundation. All rights reserved.
# Released under GPL version 3.
#
# FFMPEG Transcoder Script v1.2

PATH=/opt/local/sbin:/opt/local/bin:$PATH

INPUT=/mnt/media/Movies
FTYPE=*.1080.rip.mkv

# check if script is not running
if ! ps x | grep '[/]ffmpeg.h264.1080.sh' > /dev/null
cd $INPUT
# Transcode all files with the specified FTYPE
for FILE in $FTYPE
  # transcode and crop video stream and copy all audio streams + subtitles
  do ffmpeg -i "$FILE" -filter:v crop=1920:800:0:140 -map 0 -c:v libx264 \
  -preset slow -crf 20 -c:a copy -c:s copy "${FILE%%.*}.mkv"
done
fi

Here you can find more infos about how to crop different sizes of a video:
http://www.ffmpeg.org/ffmpeg-filters.html#toc-Examples-6