45 lines
1.2 KiB
Bash
45 lines
1.2 KiB
Bash
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#!/bin/bash
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# Tehcnically, this works. However, the static needs to scan from one side to the
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# other so you can see the difference in the two
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X=100
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Y=50
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FRAMES=10
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# Create the mask
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convert \
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-background none -fill black \
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-pointsize 24 -size ${X}x${Y} -gravity center \
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label:TEST1 mask.png
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# create pictures of static
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mkdir -p back fore out
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for i in $(seq 1 $FRAMES); do
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convert -size ${X}x${Y} canvas: +noise Random -monochrome back/${i}.png
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# Generate image of static, then mask it out using the mask.png
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convert -size ${X}x${Y} canvas: +noise Random -monochrome mask.png -compose CopyOpacity -composite fore/${i}.png
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done
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for i in $(seq 1 $FRAMES); do
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# Layer the two images
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convert back/$i.png fore/1.png -gravity center -background None -layers Flatten out/$i.png
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done
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# create gif
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# convert -delay 1 -loop 0 out/* out.gif
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# try video
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convert -size 1920x50 canvas: +noise Random -monochrome -alpha off background.png
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ffmpeg -y -framerate 30 -loop true -t 10 -i background.png -i mask.png -i background.png \
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-filter_complex "
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[0]crop=x=n:w=${X}:h=${Y}[bg];
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[2]crop=x=iw-n:w=${X}:h=${Y}[fg];
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[1]alphaextract[mask];
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[fg][mask]alphamerge[top];
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[bg][top]overlay=x=0:y=0"\
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-c:v libx264 out.mp4
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