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cli_image_processing.md

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FFMPEG

Print every .jpg size dimensions in pixels

for img in *.jpg; do [ -f "$img" ] && echo -n "$img: " && sips -g pixelHeight -g pixelWidth "$img" | grep pixel | awk '{print $2}' | paste -s -d 'x' -; done

same, but recursively

find . -type f -name "*.jpg" -print0 | while IFS= read -r -d '' img; do echo -n "$img: " && sips -g pixelHeight -g pixelWidth "$img" | grep pixel | awk '{print $2}' | paste -s -d 'x' -; done

Turn image.jpg into vertical video with black background

ffmpeg -framerate 30 -i image%d.jpg -vf "scale=iw:ih,pad=1080:1920:(1080-iw)/2:(1920-ih)/2:black" -c:v libx264 -pix_fmt yuv420p -an output.mp4

Blender .png into .mp4 (30 fps, -t to specify time)

ffmpeg -framerate 24 -pattern_type glob -i '*.png' -vf "scale=1920:1080,format=yuv420p" -c:v libx264 -crf 1 -preset fast -t 16 -pix_fmt yuv420p output.mp4

Normal speed video with one image per frame at 24 FPS

ffmpeg -framerate 24 -pattern_type glob -i '*.png' -c:v libx264 -pix_fmt yuv420p out.mp4

Extract audio from video

ffmpeg -i yes.mp4 -vn -acodec copy audio.aac

Discard audio from given video

ffmpeg -i input_video.mp4 -an -c:v copy output_video.mp4

Half the scale

ffmpeg -i input.mov -vf "scale=trunc(iw/4)*2:trunc(ih/4)*2" -c:v libx265 -crf 28 output.mov

Downscale to 1/3

ffmpeg -i input.mkv -vf "scale=trunc(iw/6)*2:trunc(ih/6)*2" -c:v libx265 -crf 28 a_third_the_frame_size.mkv

Scale to exact size

ffmpeg -i input.mov -c:a copy -s 480x280 output.mov

Make a directory and convert every .mov into .mp4

mkdir mp4
for file in *.mov; do ffmpeg -i "$file" -c:v libx264 -c:a aac -strict experimental "./mp4/${file%.mov}.mp4"; done

All GIFs inside a folder to be 1400 in width and smaller file size

for file in *.gif; do ffmpeg -i "$file" -vf "scale=1400:-1:flags=lanczos" -gifflags +transdiff -y "resized_$file"; done

Video to GIF

ffmpeg -i input.mov -vf fps=5 output.gif

Video to GIF (every 5th frame, 1080px height, nice colors)

ffmpeg -i input.mov -vf "fps=10,scale=1080:-1:flags=lanczos,palettegen" palette.png
ffmpeg -i input.mov -i palette.png -filter_complex "fps=10,scale=1080:-1:flags=lanczos[x];[x][1:v]paletteuse" output.gif

Frames to GIF

ffmpeg -r FRAMERATE -i INPUT_PATTERN -vf "scale=WIDTH:HEIGHT:flags=lanczos" -c:v gif OUTPUT.gif
ffmpeg -r 15 -i INPUT_PATTERN -vf "scale=WIDTH:HEIGHT:flags=lanczos" -c:v gif OUTPUT.gif

Convert PNG files with transparent background to GIF with transparency

ffmpeg -framerate 5 -i t-shirt-%02d.png -vf "palettegen=reserve_transparent=1" palette.png
ffmpeg -framerate 5 -i *-%01d.png -i palette.png -lavfi "paletteuse=dither=bayer:bayer_scale=5" -y output.gif

Reverse audio

ffmpeg -i input_audio.m4a -af areverse output_reversed_audio.m4a

Reverse video

ffmpeg -i input_video.mov -vf reverse output_reversed_video.mov

Convert all .mov to 24fps

for f in *.mov; do
  ffmpeg -i "$f" -r 24 -c:v copy -an "${f%.mov}_24fps.mov"
done

SIPS

Convert all .bmp into .jpeg with 80% quality

for file in *; do sips -s format jpeg -s formatOptions 80 "$file" --out "${file%.*}.jpeg"; done

Convert all .bmp into .png (lossless)

for file in *; do sips -s format png "$file" --out "${file%.*}.png"; done

CONVERT

Images inside folder to GIF

convert -delay 10 -loop 0 *.png animation.gif

Convert all non-JPG images into .jpg

for file in *.{png,webp,jpeg}; do [ -f "$file" ] && magick "$file" "${file%.*}.jpg"; done

Remove white background from every .jp2 file inside a folder

for file in *.jp2; do
  convert "$file" -fuzz 50% -transparent white "${file%.jp2}.png"
  done

Convert every .svg file into a GIF

convert -delay 100 -loop 0 '*.svg' output.gif

Change all .png (with transparent bg) from black to #FFC300

mkdir color
find . -type f -name "*.png" -exec sh -c 'convert "{}" -fill "#FFC300" -opaque black "color/${1##*/}"' sh {} \;