funkwlmpv/cache_helper.sh

#!/bin/bash

if [ ! -n "$1" ]; then
	echo 'Usage: cache_helper.sh path/to/cache'
	exit 1
fi

total_before=0
total_after=0
for i in "$1"/*/*; do
	if [ $(ffprobe -hide_banner -print_format json -select_streams a:0 -show_streams "$i" | jq -r '.streams[0].bit_rate') -gt 128000 ]; then
		size_before=$(stat --format=%s "$i")
		total_before=$(( $total_before + $size_before ))
		ffmpeg -hide_banner -loglevel error -i "$i" -vn "$i".ogg
		if [ $? -eq 0 ]; then
			size_after=$(stat --format=%s "$i".ogg)
			total_after=$(( $total_after + $size_after ))

			size_reduced=$(( $size_before - $size_after ))
			echo "Reduced: $(echo $size_reduced | numfmt --to=iec)" 
			mv "$i".ogg "$i"
		else
			echo "$i convert failed"
		fi
	else
		echo "$i already OK"
	fi
done

echo "Total before: $(echo $total_before | numfmt --to=iec)"
echo "Total after: $(echo $total_after | numfmt --to=iec)"
echo "Note: only included processed tracks"