[FFmpeg-user] Sharpen a video

Giang_Le legiangca at yahoo.ca
Wed Jan 3 20:38:40 EET 2018

I try to sharpen a video using unsharp filter. I read the documentation and
used the instruction.
But I got "videofilename.ext: Unable to find suitable output format for...".
Could some one give me an example of how to do this exactly?
Thank you

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