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#!/bin/sh
# CBR - channel / bitrate / resample
# VBR - channel / quality / resample
# bitrate - CBR
# MPEG1 - 320 256 224 192 160 128 118 96 80 64 56 48 40 32
# MPEG2 - 160 144 128 112 96 80 64 56 48 40 32 24 16 8
# bitrate - VBR
# 9 8 7 6 5 4 3 2 1 0
# sampling
# mpeg1-3 48 44.1 32
# mpeg2-3 24 22.05 16
# mpeg2.5-3 12 11.025 8
for rate in 48 44.1 32
do
for bps in 320 256 224 192 160 128 118 96 80 64 56 48 40 32
do
lame -b ${bps} -m s --resample ${rate} $1 C${bps}bps_${rate}KH_2ch.mp3
lame -b ${bps} -m m --resample ${rate} $1 C${bps}bps_${rate}KH_1ch.mp3
done
done
for rate in 48 44.1 32
do
for bps in 9 8 7 6 5 4 3 2 1 0
do
lame -V ${bps} -m s --resample ${rate} $1 V${bps}bps_${rate}KH_2ch.mp3
lame -V ${bps} -m m --resample ${rate} $1 V${bps}bps_${rate}KH_1ch.mp3
done
done |
| -m mode
mode = s, j, f, d, m
Joint-stereo is the default mode for stereo files with VBR when -V is more than 4 or fixed
bitrates of 160kbs or less. At higher fixed bitrates or higher VBR settings, the default is
stereo.
(s)imple stereo
In this mode, the encoder makes no use of potentially existing correlations between the two input
channels. It can, however, negotiate the bit demand between both channel, i.e. give one channel
more bits if the other contains silence or needs less bits because of a lower complexity.
(j)oint stereo
In this mode, the encoder will make use of a correlation between both channels. The signal will
be matrixed into a sum ("mid"), computed by L+R, and difference ("side") signal, computed by L-R,
and more bits are allocated to the mid channel. This will effectively increase the bandwidth if
the signal does not have too much stereo separation, thus giving a significant gain in encoding
quality.
Using mid/side stereo inappropriately can result in audible compression artifacts. To much
switching between mid/side and regular stereo can also sound bad. To determine when to switch to
mid/side stereo, LAME uses a much more sophisticated algorithm than that described in the ISO doc‐
umentation, and thus is safe to use in joint stereo mode.
(f)orced MS stereo
This mode will force MS stereo on all frames. It is slightly faster than joint stereo, but it
should be used only if you are sure that every frame of the input file has very little stereo sep‐
aration.
(d)ual mono
In this mode, the 2 channels will be totally independently encoded. Each channel will have
exactly half of the bitrate. This mode is designed for applications like dual languages encoding
(for example: English in one channel and French in the other). Using this encoding mode for regu‐
lar stereo files will result in a lower quality encoding.
(m)ono
The input will be encoded as a mono signal. If it was a stereo signal, it will be downsampled to
mono. The downmix is calculated as the sum of the left and right channel, attenuated by 6 dB.
|
| --resample sfreq
sfreq = 8, 11.025, 12, 16, 22.05, 24, 32, 44.1, 48
Select output sampling frequency (only supported for encoding).
If not specified, LAME will automatically resample the input when using high compression ratios. |
| CBR (constant bitrate, the default) options:
-b n For MPEG1 (sampling frequencies of 32, 44.1 and 48 kHz)
n = 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320
For MPEG2 (sampling frequencies of 16, 22.05 and 24 kHz)
n = 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160
Default is 128 for MPEG1 and 64 for MPEG2.
--cbr enforce use of constant bitrate
ABR (average bitrate) options:
--abr n
Turns on encoding with a targeted average bitrate of n kbits, allowing to use frames of different
sizes. The allowed range of n is 8 - 310, you can use any integer value within that range.
It can be combined with the -b and -B switches like: lame --abr 123 -b 64 -B 192 a.wav a.mp3 which
would limit the allowed frame sizes between 64 and 192 kbits.
The use of -B is NOT RECOMMENDED. A 128 kbps CBR bitstream, because of the bit reservoir, can
actually have frames which use as many bits as a 320 kbps frame. VBR modes minimize the use of
the bit reservoir, and thus need to allow 320 kbps frames to get the same flexibility as CBR
streams.
VBR (variable bitrate) options:
-v use variable bitrate (--vbr-old)
--vbr-old
Invokes the oldest, most tested VBR algorithm. It produces very good quality files, though is not
very fast. This has, up through v3.89, been considered the "workhorse" VBR algorithm.
--vbr-new
Invokes the newest VBR algorithm. During the development of version 3.90, considerable tuning was
done on this algorithm, and it is now considered to be on par with the original --vbr-old. It has
the added advantage of being very fast (over twice as fast as --vbr-old).
-V n 0 <= n <= 9
Enable VBR (Variable BitRate) and specifies the value of VBR quality (default = 4). 0 = highest
quality.
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