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Topic: Header, what is it? (Read 2350 times) previous topic - next topic
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Header, what is it?

when i opened the id3tag in winamp i saw this under mpeg info :

Size: 6867658 bytes
Header found at: 4315 bytes
Length: 271 seconds
MPEG 1.0 layer 3
202kbit (VBR), 10395 frames
44100Hz Joint Stereo
CRCs: No
Copyrighted: No
Original: Yes
Emphasis: None

this was an mp3 encoded with lame --alt-preset standard
but when i open the id3tag of an mp3file from a mp3image + cuesheet cut by musicutter afterwards opened and saved by mp3trim to save the vbr info i saw this

Size: 7949403 bytes
Header found at: 0 bytes
Length: 306 seconds
MPEG 1.0 layer 3
207kbit (VBR), 11732 frames
44100Hz Joint Stereo
CRCs: No
Copyrighted: No
Original: Yes
Emphasis: None

now my question is, what is this header? sorry if it is a newbie question

Header, what is it?

Reply #1 –
Looks like your first file had an ID3v2 tag, that would explain the header offset.
If I remember correctly, "header found at..." in Winamp indicates location of first valid MPEG frame in the stream.
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Header, what is it?

Reply #2 –
Quote
now my question is, what is this header? sorry if it is a newbie question

As the word implies, a header is basically something in front of something else. In the case of MP3 - and most other audio formats - the header is a series of bits which identify the stream and describe how it should be handled. Without the header, you're left guessing what king of file you have.

I don't know much about the MP3 file format, but something like ID-tags sounds like a reasonable explenation