do not stop looking for id3v2, even if one is already found
read ID3 v1 tag
read ID3 v1 tag only if no ID3 v2 tag is found
read ID3 v2 tag
read mpeg information
estimate mpeg information based on mpeg header (XING|Info)
do not parse id3v2 frames & return binary blobs
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Options of MP3 reading