[Home]Command Examples/Clipping And Resizing Guide

Boundary Conditions

    1. Reducing the video height/width by 2,4,8 Option '-r factor' can be used to shrink the video image by a constant factor, this factor can be 2,4 or 8.
    2. Clipping and changing the aspect ratio transcode uses 3 steps to produce the input image for the export modules
      1. Clipping of the input image.
      2. Changing the aspect ratio of the 1) output.
      3. Clipping of the 2) output.

Used Options

1

The first clipping is defined by the option -j top[,left[,bottom[,right]]] if you don't specify all parameters, they will be assumed to be symmetric to the others.
 -j 80 is expanded to -j 80,0,80,0 (top,left,bottom,right)
 -j 80,8 is expanded to -j 80,8,80,8
 -j 80,8,10 is expanded to -j 80,8,10,8

2

Changing the aspect ration can be done in 3 ways:

3

The 2nd clipping is defined by the option -Y top[,left[,bottom[,right]]] if you don't specify all parameters, they will be assumed to be symmetric to the others.

Usage Examples

1

Input data 16:9 widescreen DVD data, output data should have 4:3 aspect ratio without black border. Analyze the input data, we assume a black border at the top and bottom of 66 pixel in a 720x576 pixel frame.

 -j 32,0 -B 4,0 -Y 24,0

 -j 32,8 -X 0,2 -B 3,0 -Y 24,0

 -j 64,24 -X 0,7

 -j 68,0 -Z 768x360

 -j 66,0 -Z 800x368

 -j 64,0 -Z 960x448

2

Input data '16:9' DVD data without black borders, output data should have 4:3 aspect ratio.

 -B 4,0

 -j 0,24 -X 0,7

 -Z 768x472

 -Z 800x480

 -Z 960x576

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Last edited January 8, 2005 1:54 pm by Monroe (diff)
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