Determining audio bitrate and length

Hey experts,
I'm looking for either assistance with determining bitrate and track length using the Mutagen module or any other method of obtaining the info.
I'd like to be able to support these formats: FLAC, OggVorbis, MP3, WMA, and possibly ASF/M4A.  I've used a module called Mutagen for previous tag reading purposes. The project is hosted here: http://code.google.com/p/mutagen/ but unfortunately the documentation is nearly non-existent.
Does anyone know (preferably) how to use Mutagen to determine bitrate and track length or of another way to determine these?
Thanks.
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khsaterAsked:
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khsaterAuthor Commented:
Geez!  I forgot a crucial detail.  I'm running Python for cgi use on Windows as an apache module.  So, I'd prefer a pre-compiled extension for python or even just a .py script.
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Roger BaklundCommented:
It can be found in the info.length and info.bitrate properties.

An example for mp3 can be found here:

http://svn.sacredchao.net/svn/quodlibet/trunk/mutagen/TUTORIAL

    from mutagen.mp3 import MP3
    audio = MP3("example.mp3")
    print audio.info.length, audio.info.bitrate

FLAC example here, no "bitrate" in this case:

http://code.google.com/p/quodlibet/wiki/Development/Mutagen

audio = FLAC(fname)
print "Sample rate:         ", audio.info.sample_rate
print "Nr. of channels:     ", audio.info.channels
print "Bits per sample:     ", audio.info.bits_per_sample
print "Total nr. of samples:", audio.info.total_samples
print "Length in secs:      ", audio.info.length

OggVorbis and WMA:

>>> from mutagen.oggvorbis import OggVorbis
>>> a=OggVorbis('tests\\data\\empty.ogg')
>>> a.info.bitrate
112000
>>> a.info.length
3.684716553287982

>>> from mutagen.asf import ASF
>>> a=ASF('tests\\data\\silence-1.wma')
>>> a.info.bitrate
64008
>>> a.info.length
3.7120000000000002
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khsaterAuthor Commented:
Thanks, that's exactly what I was looking for.
I'll just calculate the average bitrate for FLAC files.
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