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I used an flv in my example, but it'll work on any file ffmpeg supports. It says it wants an output file, but it tells what you want to know without one.
There is 1 alternative - vote for the best!
If you can do better, submit your command here.
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obviously shorter than
mplayer -ao dummy -vo dummy -identify filename.flvmediainfo video.vlvI like the mediainfo command FranWilder submitted better than the one I did.