[ubuntu] ffmpeg crop filter

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http://ubuntuforums.org – am i right in saying that if i want to crop 40 pixels fro the top of a video and 60 pixels from the bottom, i would have to do it over two different conversions. my understanding is this would crop the top. crop 40 pixels from position x=0 -vf crop=in_w-0:in_h-40:0:0 and this would crop the bottom. crop 60 pixels from position x=516 -vf crop=in_w-0:in_h-60:0:516 is this correct??? also is it possible to crop from right to left,bottom to top rather than left to right, top to bottom? (Hardware)