Vision

ffmpeg

Translate a media file to a new type 1ffmpeg -formats 2ffmpeg -i ${input} ${output} Reduce video quality 1quality=20 2ffmpeg -i ${input}.mp4 -vcodec libx264 -crf ${quality} ${output}.mp4 A crf quality of 18 is high, while 24 is low quality. Convert from mkv to mp4 with a codec 1ffmpeg -i ${input}.mkv -codec copy …

magick

1 min read · vision memes magick

Convert jpg to png 1magick ${input}.jpg ${output}.png Reduce jpg size by reducing quality 1quality=70 2magick ${input}.jpg -quality ${quality} ${output}.jpg Reduce png size 1magick ${input}.png png8:${output}.png Invert jpg colours 1magick ${input}.jpg ${output}.jpg -negate Make jpg smaller 1magick ${input}.jpg -resize …

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 To give the document a title, put that title in the metadata: 1sed -i "1 i---" "$FILE".md 2sed -i 1 ititle: $TITLE $FILE.md 3sed -i "1 i---" "$FILE".md 4lowdown -L "$FILE".md 5lowdown -X title "$FILE".md 6lowdown -stms …

Record a Terminal Session

1 min read · vision share

Record a terminal command, then press 'Control + d' to exit. 1script --timing=time.log stat.txt 2ls -a 3ls -al 4stat ~/.bashrc 5^D Replay the session: 1scriptreplay --timing=time.log stat.txt Try a bare command, without any timing: 1script -c 'top | lolcat' loltop 2nl loltop Has your terminal messed up? Is the cursor …