| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> | |
| <meta content='width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0' name="viewport" /> | |
| <link rel="icon" href="data:,"> | |
| <title>String art</title> | |
| <script type="text/javascript" src="jquery.min.js"></script> | |
| <style> | |
| html, body { |
| import collections | |
| import math | |
| import os | |
| import cv2 | |
| import numpy as np | |
| import time | |
| MAX_LINES = 4000 | |
| N_PINS = 36*8 | |
| MIN_LOOP = 20 # To avoid getting stuck in a loop |
| # Output a single frame from the video into an image file: | |
| ffmpeg -i input.mov -ss 00:00:14.435 -vframes 1 out.png | |
| # Output one image every second, named out1.png, out2.png, out3.png, etc. | |
| # The %01d dictates that the ordinal number of each output image will be formatted using 1 digits. | |
| ffmpeg -i input.mov -vf fps=1 out%d.png | |
| # Output one image every minute, named out001.jpg, out002.jpg, out003.jpg, etc. | |
| # The %02d dictates that the ordinal number of each output image will be formatted using 2 digits. | |
| ffmpeg -i input.mov -vf fps=1/60 out%02d.jpg |
Title: Simple Sabotage Field Manual Author: Strategic Services Office of Strategic Services
Here’s how to make animations like this one. It requires intermediate Unix command-line knowledge, to install some tools and to debug if they don’t work. You’ll need these utilities:
curl (or you can translate to wget)convert and montage, part of ImageMagickffmpeg, plus whatever codecsparallel, for iteration that’s nicer than shell for loops or xargszsh for leading 0s in numerical ranges to work
Commonly used scientific symbols in pandoc markdown
encoding is UTF-8, needs xelatex, like this:
---
output:
pdf_document:
latex_engine: xelatex
---