I always forget how to do this:
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| ffmpeg -i iphone-portrait-orientation.mov -b <bitrate-of-source-file>k iphone-portrait-orientation.avi
mencoder -vf rotate=1 -o iphone-landscape-orientation.avi -oac copy -ovc lavc -lavcopts vbitrate=<bitrate-of-source-file> iphone-portrait-orientation.avi
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