Re: [libextractor] BUG wrong VBR bitrate

[Christian Grothoff]

Hi!

Sorry for the late reply.  I've so far been unable to find a VBR mp3 to begin 
with, which makes this problem harder for me to reproduce.  Furthermore, there 
is an inherent limitation in how LE calculates VBRs, which is that it takes a 
(limited) number of samples, not the entire file, for the calculation.  So if 
you have a VBR mp3 that initially has roughly 128 kbps and later more, this 
would still be the expected result (scanning the entire file is something I 
would consider too expensive).

Now, the calculations done might be wrong, but they look fine -- and I'm not 
an expert on mp3 to begin with.  If someone could show me where 
mp3_extractor.c is wrong here (ideally with a sample mp3), I'll of course be 
happy to look into this some more or integrate a patch.

Happy hacking,

Christian

On Saturday, October 23, 2010 11:01:11 am pyro pingvin wrote:
> For some mp3 files I see a wrong VBR bitrate reported. Instead of e.g.
> ~253kbps, I see values like 128kbps (as if it's a CBR file)