I am interested is VBR encoding so when I discovered LAME I started to play
with it.
For relative low quality I used -V 7 and didn't specify a minimum bit rate.
To increase the quality I changed to -V 5 and added -b 64 (or something
comparable). After upgrading from 3.50 to 3.58 I saw that a low pass filter
was applied (cutting above 15,xxx Hz and decreasing above 12,xxx Hz) in
this case.
My first question is: is this automatic filter also in 3.50 (there was no
output on the screen that told me about the filter in this version).
I discovered that this low pass filter was induced by the bit rate setting
and independent from the VBR quality setting. I thought that the point
where this filter isn't used is somewhere around 112.
When I want to encode a file containing some difficult/dynamic parts and
some easy parts using VBR I have the following options:
lame -v -b 80 -h file.wav file.mp3
in this case the low pass filter is used so especially the dynamic parts
aren't at best
lame -v -h file.wav file.mp3
no low pass, but the easy parts may have a to low bit rate
lame -v -b 128 -h file.wav file.mp3
no low pass, no low bit rate for easy parts, but file size is bigger then
necessary (getting a smaller file is the most important reason for encoding
it to mp3, isn't it?)
So my second question is how to control (or disable) this filter manually?
Marc
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