I recorded audio from BBC news into a WAV file for about 3 minutes.
The audio is 44 KHz, 8 bit mono and 7.3 MB in size.  Then I converted
it to OGG and MP3 formats using 'oggenc' and 'bladeenc' respectively.
To my surprise, the size of OGG file was 3.1 MB and that of MP3 was
1.3 MB.  So it seems that OGG files are not always smaller than MP3.
Probably the OGG format has advantage over MP3 with specific type of
data.

Not only this, I had recorded a number of conversation tracks from an
audio CD and then converted them into OGG and MP3 format and I found
that sometimes the OGG file would be bigger than MP3, although
slightly.

This might also have to do with the the "8 bit mono" audio recorded
from BBC news and "16 bit sterio" data recorded from the audio CD.
Considering that the size of OGG file is more than twice the size of
MP3 file, I suppose that the OGG file is having information for two
channels, which is redundant, since the input WAV is mono.

Can anyone elaborate?

-- 
Abhir Joshi
http://education.vsnl.com/abhir/
No one can be told what the Matrix is, you have to see it for yourself.
                  --- Morpheus from "The Matrix"


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