The basic problem still seems to be that you're not doing anything about the frame data. You might try something like this:
$position = 10;
$id3_end = 10 + $id3_size;
while ($position < $id3_end) {
seek FH, $position, SEEK_SET;
# read $frame_id, $frame_size, and $frame_flags
$position += 10 + $frame_size;
last if $frame_id =~ /\W/ || $position > $id3_end;
# do something with $frame_id
}
The "last if" line is a sanity check, because some ID3 writers leave a mess behind them.
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