I see some online info on id3v2 such as http://www.id3.org/id3v2.4.0-structure.txt, however, I cannot figure out how long id3v2 tag is (id3v1 is too easy.)
The document says the header reads
ID3v2/file identifier "ID3" ID3v2 version $04 00 ID3v2 flags %abcd0000 ID3v2 size 4 * %0xxxxxxx
Looking at actual mp3 files, I can see id3v2 identifier (ID3) and ID3v2 version, but I cannot understand id3v2 flags and size, especially %abcd0000 and 4 *%0xxxxxxx part.
Will anyone help me?
Thanks in advance!