#!/usr/bin/env bash

export FFMPEG_FLAGS='-c:v libsvtav1 -crf 30 -preset 6 -vf scale=trunc(iw/2)*2:trunc(ih/2)*2 -pix_fmt yuv420p -movflags faststart -loop 0'

while IFS= read -r -d '' file; do
    dir=$(dirname "$file")
    name=$(basename "$file")
    output="${name%.*}.mkv"

    pushd "$dir" > /dev/null || continue

    if [[ -e "$output" ]]; then
        echo "Skipping existing: $output"
        popd > /dev/null
        continue
    fi

    echo "Converting: $file -> $output"
    ffmpeg -nostdin -i "$name" $FFMPEG_FLAGS "$output"
    popd > /dev/null
done < <(find . -type f -iname "*.gif" -print0)