convert_to_opus

#!/bin/bash

convert_to_opus() {
    find "$1" -type f -iname "*.flac" -print0 | xargs -0 -I {} bash -c '
        file="${1}"  
        output="${file%.flac}.opus"

        # Check if the file is already 24-bit and 48kHz
        bit_depth=$(ffmpeg -i "$file" 2>&1 | grep -oP "Stream.*Audio:.*?(\d+) Hz, \d+ channels, s(\d+)")
        sample_rate=$(ffmpeg -i "$file" 2>&1 | grep -oP "Stream.*Audio:.*?(\d+) Hz, \d+ channels, s\d+" | grep -oP "(\d+) Hz")

        if [[ $bit_depth =~ s24 && $sample_rate -eq 48000 ]]; then
            echo "Skipping \"$file\" (already 24-bit, 48kHz)"
            convert_needed=0
        else
            echo "Converting \"$file\" to 24-bit, 48kHz"
            convert_needed=1
        fi

        # Convert to Opus (128 kbps VBR) with optional resampling
        echo "Encoding \"$file\" to Opus"
        if [[ $convert_needed -eq 1 ]]; then
            ffmpeg -y -i "$file" -c:a flac -sample_fmt s32 -ar 48000 -af "aresample=resampler=soxr:precision=28:dither_method=triangular" - | \
            ffmpeg -y -i - -c:a libopus -b:a 128k -vbr on -map_metadata 0 "$output"
        else
            ffmpeg -y -i "$file" -c:a libopus -b:a 128k -vbr on -map_metadata 0 "$output"
        fi

        if [[ $? -eq 0 ]]; then
            echo "Successfully converted: $output"
        else
            echo "Conversion failed for: $file"
            exit 1
        fi
    ' _ {}
}

# Start from current directory or specified directory
start_dir="${1:-.}"
convert_to_opus "$start_dir"