[FFmpeg-user] Output tiles onto a black background

Molly Millions mollyrazormillions at gmail.com
Thu Jun 13 15:57:33 CEST 2013

I have the following command, which converts a video and also generates a
10x9 tileset. Currently it gets the longer side and either generate a 90px
wide or 45px tall tiles. My problem is that each tile has to be 90x45
large, so in essence what I need is a properly resized and centered tile
inside a black bounding box. How can I achieve this?

The resulting tile:

What I would like to achieve:

ffmpeg -i K/vertical.mp4 .... vertical.out.mp4
-an -vsync vfr -vf
-qscale:v 3 './f/f%03d.jpg'

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