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mp4tag

    MP4 File Tagger - Version 1.2 (Bento4 Version 1.6.0.0)
    (c) 2002-2008 Axiomatic Systems, LLC
    usage: mp4tag [options] [commands...] <input> [<output>]
    commands:
      --help            print this usage information
      --show-tags       show tags found in the input file
      --list-symbols    list all the builtin symbols
      --list-keys       list all the builtin symbolic key names
      --set <key>:<type>:<value>
          set a tag (if the tag does not already exist, set behaves like add)
      --add <key>:<type>:<value>
          set/add a tag
          where <type> is:
            S    if <value> is a UTF-8 string
            LS   if <value> is a UTF-8 string with a language code (see notes)
            I8   if <value> is an 8-bit integer
            I16  if <value> is a 16-bit integer
            I32  if <value> is a 32-bit integer
            JPEG if <value> is the name of a JPEG file
            GIF  if <value> is the name of a GIF file
            B    if <value> is a binary string (see notes)
            Z    if <value> is the name of a builtin symbol
      --remove <key>
           remove a tag
      --extract <key>:<file>
           extract the value of a tag and save it to a file
    NOTES:
      In all commands with a <key> argument, except for '--add', <key> can be
      <key-name> or <key-name>#n where n is the zero-based index of the key when
      there is more than one key with the same name (ex: multiple images for cover
      art).
      A <key-name> has the form <namespace>/<name> or simply <name> (in which case
      the namespace defaults to 'meta').
      The <name> of a key is either one of a symbolic keys
      (see --list-keys) or a 4-character atom name.
      The namespace can be 'meta' for itunes-style metadata or 'dcf' for
      OMA-DCF-style metadata, or a user-defined long-form namespace
      (ex: com.mycompany.foo).
      Binary strings can be expressed as a normal string of ASCII characters
      prefixed by a + character if all the bytes fall in the ASCII range,
      or hex-encoded prefixed by a # character (ex: +hello, or #0FC4)
      Strings with a language code are expressed as: <lang>:<string>,
      where <lang> is a 3 character language code (ex: eng:hello)