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Topic: LAME: Command line help please (Read 2727 times) previous topic - next topic
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LAME: Command line help please

Hi all, great forum

I need to set a VBR compression so that the minimum compression is 192 and the max is 256. Can this be done?

Currently I have a basic 320 setup:

Code: [Select]
-b 320 --add-id3v2 --pad-id3v2 --ta "%a" --tt "%t" --tl "%g" --ty "%y" --tn "%n" %s %d


Any help greatly appreciated

Thanks

LAME: Command line help please

Reply #1 –
I would use:

Code: [Select]
-V1 --vbr-new --add-id3v2 --pad-id3v2 --ta "%a" --tt "%t" --tl "%g" --ty "%y" --tn "%n" %s %d


It doesn't exactly answer your question, but your requirements are, quite frankly, plain silly.

According to this table in the wiki the VBR preset -V1 matches your requirements most accurately.  The presets are a way more sensible way to attain a certain quality for your music.  This may result in MP3s with a bitrate lower than 192 or higher than 256 in some frames, at the price of a better quality MP3.

[span style='font-size:8pt;line-height:100%']Edit: clarified "in some frames"[/span]
I'm on a horse.

LAME: Command line help please

Reply #2 –
Synthetic Soul is right on the money, anyway from the docs in the LAME bundle available on RareWares.org:
Code: [Select]
* -b n    bitrate 
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 kbps for MPEG1 and 64 kbps for MPEG2. 

When used with variable bitrate encoding (VBR), -b specifies the minimum bitrate to be used. However, in order to avoid wasted space, the smallest frame size available will be used during silences. 

--------------------------------------------------------------------------------

* -B n    maximum VBR/ABR bitrate  
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

Specifies the maximum allowed bitrate when using VBR/ABR 

The use of -B is NOT RECOMMENDED. A 128kbps CBR bitstream, because of the bit reservoir, can actually have frames which use as many bits as a 320kbps frame. VBR modes minimize the use of the bit reservoir, and thus need to allow 320kbps frames to get the same flexibility as CBR streams.
WavPack 5.7.0 -b384hx6cmv / qaac64 2.80 -V 100
 

LAME: Command line help please

Reply #3 –
If you insist on creating such weird, needlessly bloated and poor sounding MP3s, you could use:

-V1 -b 192 -B 256
or
-V0 -b 192 -B 256

I'd be irresponsible though if i didn't point out that setting a -b option will needlessly increase bloat, and setting a -B option will needlessly decrease quality. Let the Lame developers decide how best to make MP3s and just use a -V setting.