Usage :
  sndfile-metadata-get [options] <file>

Options:
    --bext-description     Print the 'bext' description.
    --bext-originator      Print the 'bext' originator info.
    --bext-orig-ref        Print the 'bext' origination reference.
    --bext-umid            Print the 'bext' UMID.
    --bext-orig-date       Print the 'bext' origination date.
    --bext-orig-time       Print the 'bext' origination time.
    --bext-loudness-value  Print the 'bext' loudness value.
    --bext-loudness-range  Print the 'bext' loudness range.
    --bext-max-truepeak    Print the 'bext' max. true peak level
    --bext-max-momentary   Print the 'bext' max. momentary loudness
    --bext-max-shortterm   Print the 'bext' max. short term loudness
    --bext-coding-hist     Print the 'bext' coding history.

    --str-title            Print the title metadata.
    --str-copyright        Print the copyright metadata.
    --str-artist           Print the artist metadata.
    --str-comment          Print the comment metadata.
    --str-date             Print the creation date metadata.
    --str-album            Print the album metadata.
    --str-license          Print the license metadata.

Using libsndfile-1.2.2.