ffmpeg Audio Conversion Notes

ffmpeg_convert_audio

for f in *.flac ; do
    # Regex for whitespaces in filenames.
    # Specify input and output filetypes.
    out="${f[@]/%flac/mp3}"

    # Use -qscale or -vbr for VBR [0-9].
    # 0: slowest & best possible algo
    # 1: slow and not as high quality
    # 2: recommended (same as -h)
    # 5: default; good speed, reasonable quality
    # 7: very fast, ok quality (same as -f)
    # 9: disables most algos; poor quality
    ffmpeg -i "$f" -qscale:a 0 "$out"

    # Can specify codec: -codec:a libmp3lame
    # Metadata tags auto transferred by ffmpeg, but specified for example.
    # For CBR [320k] and keep metadata tags (mp3 only):
    # ffmpeg -i "$f" -ab 320k -map_metadata 0 -idv2_version 3 "$out"

    # To convert to ALAC (.m4a):
    # ffmpeg -i "$f" -c:a alac "${f%.*}.m4a"
    # (ffmpeg -i "$f" -c:a alac "$out")

    # To convert to AAC (VBR or CBR):
    # ffmpeg -i "$f" -c:a libfdk_aac -vbr 0 "$out"
    # ffmpeg -i "$f" -c:a libfdk_aac -b:a 320k
done