Video Resizing

Introduction

As with many things with transcode, resizing of the video can be done in different ways, at different times. This is the fixed processing order (resizing options are highlighted):

 -j -I -X -B -Z -Y -r -z -l -k -K -G -C

The -r n[,m] option reduces the height/width by factor n[,m]. Other, more flexible ways for resizing the video are

• (fast) shrinking the image with option -B n[,m]
• (fast) expanding the image with option -X n,[m]
• (high quality) resizing with option -Z wxh

Examples

All the following examples use the same 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.

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Using the fast resizing option -B, shrinking the height to reach a correct aspect ratio.

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

Final image size: 720x336 pixel.

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Using the fast resizing options -X and -B, removing 1% at the left&right border, expanding the image width to PAL resolution, and shrinking the height to reach a correct aspect ratio.

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

Final image size: 768x368 pixel.

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Using the fast -X resizing, expanding the image width, but removing 3% of the image at the left and the right border.

 -j 64,24 -X 0,7

Final image size: 896x448 pixel.

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Using the slower -Z resizing, expanding the image width to PAL resolution.

 -j 68,0 -Z 768x360

Final image size: 768x360 pixel.

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Using the slower -Z resizing, 800 Pixel image width.

 -j 66,0 -Z 800x368

Final image size: 800x368 pixel.

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Using the slower -Z resizing, expanding the image width.

 -j 64,0 -Z 960x448

Final image size: 960x448 pixel.