<p>Use this:</p>

<pre><code>-vf "scale=iw*min(1920/iw\,1080/ih):ih*min(1920/iw\,1080/ih), pad=1920:1080:(1920-iw*min(1920/iw\,1080/ih))/2:(1080-ih*min(1920/iw\,1080/ih))/2"
</code></pre>

<p>This code evaluates which ratio to apply for scaling, then scales it and finally applys the requisite amount of padding.</p>

CC BY-SA 3.0
2015-07-21T07:06:59.987Z
2015-07-21T07:06:59.987Z
Gyan
<p>I want to know how to use the scale filter to take an image that is 2154x1136 and scale it down exactly 89.04% such that the image sits in a 1920x1080 frame, with full image left and right and black letterboxing top and bottom.  Using </p>

<pre><code>vf scale=1920:-1
</code></pre>

<p>gets me close.   But the resulting file is 1920x1013 and I need to add black pixels top and bottom to fill it out to 1920x1080.   </p>

<p>I have other issues including how to feed ffmpeg a dpx sequence and get back an Avid-ready MXF while applying a shot specific cdl file and a show specific display lut, but I need to walk before I can run so a bit of help with this first puzzle is what I'm asking for now.  </p>

<p>Thank you in advance.  </p>

<ffmpeg><scale>
ffmpeg - resize and crop
pirxx
# ffmpeg - resize and crop

(Asked by: username_0 on 2015-07-21)

I want to know how to use the scale filter to take an image that is 2154x1136 and scale it down exactly 89.04% such that the image sits in a 1920x1080 frame, with full image left and right and black letterboxing top and bottom.  Using 
vf scale=1920:-1

gets me close.   But the resulting file is 1920x1013 and I need to add black pixels top and bottom to fill it out to 1920x1080.   
I have other issues including how to feed ffmpeg a dpx sequence and get back an Avid-ready MXF while applying a shot specific cdl file and a show specific display lut, but I need to walk before I can run so a bit of help with this first puzzle is what I'm asking for now.  
Thank you in advance.

**Tags:** ffmpeg, scale


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## 1 answers

### Answer by username_1 on 2015-07-21. Score: 6

Use this:
-vf "scale=iw*min(1920/iw\,1080/ih):ih*min(1920/iw\,1080/ih), pad=1920:1080:(1920-iw*min(1920/iw\,1080/ih))/2:(1080-ih*min(1920/iw\,1080/ih))/2"

This code evaluates which ratio to apply for scaling, then scales it and finally applys the requisite amount of padding.


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