[FFmpeg-user] set image width only?

[lovelove]

Hi. Sorry for being a newbie, but I have looked everywhere in
http://ffmpeg.org/ffmpeg-doc.html and only found *-s WxH*, but how can I
/set the width/ e.g. to 400 /*without specifying the height*/ (which FFmpeg
should determine itself based on the aspect ratio)? (I'm outputting still
images). Many thanks.

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