Quote:
Originally Posted by Dublo7 /img/forum/go_quote.gif
By V0, you mean Variable Bitrate, right?
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Actually, the -V n command line switch specifies the quality level (vs file size) for VBR encoding. I've seen this referred to in many posts, and I'm not ashamed (OK, I'm a little ashamed) to admit that I had no idea what this meant. So I downloaded EAC and checked the help file. According to the LAME encoder help file:
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VBR quality setting
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-V n
n = 0...9. Specifies the value of VBR_q.
default = 4, highest quality = 0, smallest files = 9
Using -V 6 or higher (lower quality) is NOT RECOMMENDED.
ABR will produce better results.
How is VBR_q used?
The value of VBR_q influences two basic parameters of LAME's psycho
acoustics:
a) the absolute threshold of hearing
b) the sample to noise ratio
The lower the VBR_q value the lower the injected quantization noise
will be.
*NOTE* No psy-model is perfect, so there can often be distortion which
is audible even though the psy-model claims it is not! Thus using a
small minimum bitrate can result in some aggressive compression and
audible distortion even with -V 0. Thus using -V 0 does not sound
better than a fixed 256 kbps encoding. For example: suppose in the 1 kHz
frequency band the psy-model claims 20 dB of distortion will not be
detectable by the human ear, so LAME VBR-0 will compress that
frequency band as much as possible and introduce at most 20 dB of
distortion. Using a fixed 256 kbps framesize, LAME could end up
introducing only 2 dB of distortion. If the psy-model was correct,
they will both sound the same. If the psy-model was wrong, the VBR-0
result can sound worse.
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I really haven't paid much attention to the granular details of MP3 encoding, since I only use MP3s purchased from eMusic, which obviously show up pre-ripped. My own ripping is either to FLAC or ATRAC (Don't tase me, dude) but I'm intrigued by the options offered by EAC. I'm definitely going to use it for extraction, and, who knows, maybe I'll end up drinking the Kool-Aid.