74 lines
1.7 KiB
Plaintext
Executable file
74 lines
1.7 KiB
Plaintext
Executable file
#!/usr/bin/env nix-shell
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#! nix-shell -i bash -p ffmpeg gifsicle
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# Uses ffmpeg to convert a video file to a gif file. Optimizes the final result
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# with gifsicle.
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#
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# Requires: ffmpeg
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# Optional: gifsicle
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#
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# Example:
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# vid2gif some-vid.mp4 output.gif
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# vid2gif -f 10 -s 00:00:10 -t 00:00:05 some-vid.mp4 output.gif
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set -e
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PALETTE="/tmp/palette.png"
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usage() {
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cat <<EOL
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Usage: ${0##*/} [-fsSth] SOURCE_FILE [destfile]
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-f [FPS] set frames per second
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-s [hh:mm:ss] set starting time (like -ss in ffmpeg)
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-S [W:H] set width/height (either can be -1 for auto)
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-t [hh:mm:ss] set the duration to capture (like -t in ffmpeg)
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-h this help
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EOL
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}
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cleanup() { rm -f "$PALETTE"; }
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trap cleanup EXIT
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#
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fps=30
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while getopts hf:s:t:S: opt; do
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case $opt in
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f) fps="$OPTARG" ;;
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s) start="-ss $OPTARG" ;;
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S) scale=",scale=$OPTARG:flags=lanczos" ;;
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t) duration="-t $OPTARG" ;;
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h) usage
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exit
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;;
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:) >&2 echo "$OPTARG requires an argument"
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usage
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exit 1
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;;
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*) >&2 echo "Not a valid arg: $opt"
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usage
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exit 1
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;;
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esac
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done
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shift $((OPTIND-1))
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#
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if (($# == 0)); then
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>&2 echo "No movie file specified"
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exit
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elif [[ ! -f $1 ]]; then
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>&2 echo "$1 does not exist"
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exit
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fi
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src="$1"
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dest="${2:-${src%.*}.gif}"
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flags="fps=${fps}$scale"
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# stats_mode=full favors motion, causing the resulting palette to better
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# accomodate fades and transitions.
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ffmpeg -v warning $start $duration -i "$src" -vf "$flags,palettegen=stats_mode=full" -y "$PALETTE"
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ffmpeg -v warning $start $duration -i "$src" -i "$PALETTE" -lavfi "$flags [x]; [x][1:v] paletteuse" -y "$dest"
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gifsicle -O3 "$dest" -o "$dest"
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