Vision

ffmpeg

Basics Translate a media file to a new type. ffmpeg -i [input file] output_file.mkv The input file might be a device, such as a camera. Record screen Take the format as 'grab the x11 screen'. 1ffmpeg -f x11grab -s [screensize] -i :0.0 out.mkv Get screensize with 1xrandr -q or maybe just... 1ffmpeg -f x11grab -s …

imagemagick

2 min read · vision

Convert jpg to png. 1magick image.jpg image.png 1magick image.jpg -quality 50 image.jpg 'Quality' must be from 1 to 100. 1magick -resize 50% image.jpg image2.jpg Resizing only changes jpegs. Change a png with: 1magick input.png png8:out.png Invert Colours 1magick input.jpg output.jpg -negate Make Images Smaller 1magick …

Make a gif

1 min read · vision

Split your video into frames. 1d=$(mktemp -d) 2cp $vid.mp4 $d 3cd $d 4 5ffmpeg -i $vid.mp4 -vf "fps=10, scale=360:-1" frame%04d.png 6gifski --fps 10 -o ${out}.gif frame*.png Optimize: 1gifsicle --optimize=3 --lossy=100 -o ${final}.gif ${out}.gif

Markdown to PDF

1 min read · markdown .pdf vision

Turn a markdown file into a pdf: 1lowdown -stms "$FILE".md | pdfroff -itk -mspdf > "$FILE".pdf Example: put this Makefile in a directory, rename it Makefile, then do: 1make example 2make To give the document a title, put that title in the metadata: 1sed -i "1 i---" "$FILE".md 2sed -i "1 ititle: $TITLE" "$FILE".md 3sed …