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vid2gif: add more descriptive error messages instead of just exiting
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nix/vid2gif.nix
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nix/vid2gif.nix
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builtins.replaceStrings
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[
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"#!/bin/sh"
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"ffmpeg"
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"mktemp"
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"printf"
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"rm"
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"ffmpeg"
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]
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[
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"#!${bash}/bin/sh"
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"${ffmpeg}/bin/ffmpeg"
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"${coreutils}/bin/mktemp"
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"${coreutils}/bin/printf"
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"${coreutils}/bin/rm"
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"${ffmpeg}/bin/ffmpeg"
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]
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(builtins.readFile ../scritps/vid2gif)
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)
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scritps/vid2gif
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scritps/vid2gif
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filters="scale=iw*${scale}:-1:flags=lanczos"
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palette_file=$(mktemp --tmpdir XXX.png)
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[ -z "$1" ] && exit 1
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[ -z "$2" ] && exit 1
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[ -z "$1" ] && {
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printf '%s\n' "${0##*/}: missing input video"
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exit 1
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}
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[ -z "$2" ] && {
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printf '%s\n' "${0##*/}: missing output gif"
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exit 1
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}
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ffmpeg -hide_banner -loglevel warning -i "$1" -vf "$filters,palettegen" -update true -y "$palette_file"
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ffmpeg -hide_banner -loglevel warning -i "$1" -i "$palette_file" -filter_complex "$filters,paletteuse" "$2"