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I'm trying to do a simple conversion using the following arguments from Fabio Sonnati's blog.

ffmpeg –i source.MOV –r 15 –s 320×240 –an video.flv

Getting this error

Unable to find a suitable output format for '–i'
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up vote 5 down vote accepted

The culprit lies in the blog post itself. The author used the en-dash instead of the hypen-minus (, not -), so FFmpeg will choke on that and not recognize i as the input option.

Moreover, the author used the multiplication sign instead of a latin x for the size (×, not x).

To fix this, replace the command with:

ffmpeg -i source.MOV -r 15 -s 320x240 -an video.flv

And go write the author a mail that they should fix their examples.

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THANKS!! Will let Fabio know – eco_bach Oct 21 '12 at 15:16

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