Clever image/video editing commands

ffmpeg_commands.sh

# Resize pixel art images (permanently changes source images)
mogrify -filter point -resize 200% image*

# Take a vertical image and make it square with blurry letterbox things. Uses clever filter graph stuff
ffmpeg -i input.mp4 -vf 'split [original][copy]; [copy] crop=ih*9/16:ih:iw/2-ow/2:0, scale=1280:2282, gblur=sigma=20[blurred]; [blurred][original]overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/2' output.mp4

# Take a bunch of images and turn them into a gif with a good palette
# (see https://www.ffmpeg.org/ffmpeg-formats.html#image2-1 for the format of $frame_pattern)
ffmpeg -f image2 -i "$frame_pattern" -filter_complex "[0:v] palettegen" -y "$palette"
ffmpeg -f image2 -i "$frame_pattern" -framerate 30 -i $palette -filter_complex "[0:v][1:v] paletteuse" -y "${out_filename}"

# Optimise a gif with gifsicle
gifsicle --optimize --colors=16 "${out_filename}" -o "${out_filename}"

# Take a bunch of images and turn them into a mp4
ffmpeg -f image2 -i "$frame_pattern" -pix_fmt yuv420p -y "${out_filename}"

# Take a bunch of images, loop them into a movie that's 6 seconds long
ffmpeg -framerate 10 -f image2 -loop 1 -i frame-%d.png -pix_fmt yuv420p -t 00:00:06 -y animation.mp4
# Do the above, but crop to be square
ffmpeg -framerate 10 -f image2 -loop 1 -i frame-%d.png -pix_fmt yuv420p -t 00:00:06 -y -vf "crop=ih:ih:(iw-ih)/3:0" animation-crop.mp4

# Add images into a gif that's 1 sec long, also scale it so it's not too big.
ffmpeg -loop 1 -framerate 10 -f image2 -i frame-%d.png -i palette.png -filter_complex "[0:v] scale=544:-1 [scaled];[scaled][1:v] paletteuse" -y -t 00:00:09.9 out.gif

# Using images in ffmpeg that aren't named frame001.png, etc:
-pattern_type glob -i '*.png'