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Full Version: [X] Wrong kBit/s and length
Mp3tag Forums > Mp3tag - International > Bug Reports > No Bugs
pueblo funky
The latest 2.42 shows a wrong kBit/s & Frequency on some MP3's.

Tag & Rename 3.5 RC1 shows it correctly - also RealPlayer.

All files are 320 kBit/s (except the one with 384).

The frequency is always 44100 Hz - (except the one with 48000 Hz).


See Screen Shot:
Click to view attachment

Florian, if you need the wrong displayed MP3's - please contact me.
pueblo funky
Hi Florian,

I've just analyzed the one file of the screen shot where mp3tag 2.42 shows 32 kBit/s and 48.000 Hz - but other software shows 320 kBit/s and 44.100 Hz (and it sounds like that).

Here is the analyze of the 32-Bit-Header:

CODE
00000000h: EE 56 A0 00 B9 90 69 7D CA 54 00 26 DE 17 5A 19; îV .¹�i}ÊT.&Þ.Z.


32-Bits - which is

CODE
EE = 1110 1110
56 = 0101 0110
A0 = 1010 0000
00 = 0000 0000


and the header definition (the number of bits in paranthesis)

CODE
A     Syncword (12)
B     MPEG Version (1)
C     MPEG Layer (2)
D     Protection Bit (1)
E     Bitrate (4)
F     Sampling Frequency (2)
G     Padding (1)
H     Private (1)
I     Channel-Mode (2)
J     Mode-Extension (2)
K     Copyright (1)
L     Original (1)
M     Emphasis (2)


which are the bits:

CODE
A 111011100101
B 0
C 11
D 0
E 1010
F 00
G 0
H 0
I 00
J 00
K 0
L 0
M 00


and when I look on e.g.

http://swlab.et.fh-duesseldorf.de/pc_pool/...n/Kapitel32.htm

so
B is not set => MPEG 2
C is 11 => Layer III

mp3tag.de shows MPEG 1 / Layer I ...

E (Bitrate) = 1010 which is in the table under MPEG 2 / Layer III => 160 kBit/s, but mp3tag.de shows 32kBit/s.

F (Sampling Freq). = 00 = 22.050 Hz ... and not 48.000 Hz


Hmm .. all sounds very mysterious with this file .. RealPlayer shows 320 kBit/s, Tag & Rename shows 320 kBit/s & 44.100 Hz (Lame 3.82), Directory Opus plugin shows the same values as mp3tag - but it's definitely not 32kBit/s ;-)

Please let me know if you need the MP3 file - THX.
Sebastian Mares
You didn't pick up the right sequence (frame header) since syncwords have the first 12 bits set, so it should be something like FF F? and definitely not EE ??.
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