[FFmpeg-user] How to set histogram size?

Pedro ffmpeg at 11.to
Mon Apr 6 22:32:45 CEST 2015

I'm trying to add a waveform histogram to a video. I'm following this 
<https://trac.ffmpeg.org/wiki/FancyFilteringExamples#waveform> example 
but I'm having trouble setting the size of the histogram, this is code 
I'm using:

*ffmpeg -y -report -i input.mp4 -vf 

I've tried to play around with the *|pad|***and *|crop|***values without 
How can I set the size of histogram to 100 pixels only?

Thank you!

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