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> Date: Sat, 08 Apr 2000 11:47:52 EDT
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> When I encode with the -V2 switch, I get full bandwidth (no filters
> activated), but when I specifie a minimum bitrate switch -b160 or even
> -b256, lame applies a low pass filter. Oddly enough, -b128 or lower doesn't
> trigger the low pass filter. Any one have any ideas? I'm using lame 3.70.
>
>
Good point. LAME bases the filter on the computed
"compression_ratio". With VBR we dont actually know the compression
ratio, and LAME takes its best guess. But this guess was being
overridden if you specified a minimum bitrate.
I just changed the code to:
/* for VBR, take a guess at the compression_ratio. for example: */
/* VBR_q compression like
0 4.4 320kbs/41khz
1 5.4 256kbs/41khz
3 7.4 192kbs/41khz
4 8.8 160kbs/41khz
6 10.4 128kbs/41khz
*/
if (gfp->VBR) {
compression_ratio = 4.4 + gfp->VBR_q;
}
so -V2 should behave like 224kbs = no filters.
Mark
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