[FFmpeg-user] Padding in ffmpeg

[Jim Worrall]

I'm far from an expert, but suspect you may need to scale the video down first, then add the padding.  You might try
-s WxH, or
-vf scale=W:H

I don't know what the difference is.  I would try to add one of these before your -vf pad=

 
On Sep 2, 2011, at 1:17 PM, Mark Richards wrote:

Hello all,

I am trying to understand the new padding syntax, but I am struggling to get
it to work.

My source video is 720x576  (5:4)
My output size is 640x360    (16:9)

The source scaled down to 360 pixels high is 450x360.

I want to pillarbox the video, so it ends up with a 94 pixel pillar on each
side of the video.

Since I want the output to be 640x360, these are the params I tried
(roughly)

-vcodec libx264 -fpre libx264-fast.ffpreset -fpre libx264-main.ffpreset
-aspect 16:9 -b 600k ........      -aspect 16:9 -w 640 -h 360 -vf
pad=640:360:94:0:red   



But, ffmpeg gives me back this error.
Input area 94:0:734:360 not within the padded area 0:0:440:360 or zero-sized

I guess I clearly don't understand the documentation, cause I've tried every
combination of parameters I can think of, and can't get around that message.

I tried the formula from the documentation, and while it runs, it gives me a
640x640 video that is completely squashed.  

vf pad="max(iw\,ih):ow:(ow-iw)/2:(oh-ih)/2"



You help is greatly appreciated!

Mark

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