----- Original Message -----
From: "vdbj" <[EMAIL PROTECTED]>
To: "Caster" <[EMAIL PROTECTED]>
Sent: Tuesday, May 16, 2000 2:51 AM
Subject: Re[2]: [MP3 ENCODER] VBR Bug Report - confirmed
> Hello Caster,
>
> Monday, May 15, 2000, 10:39:52 PM, you wrote:
>
> C> But I expect that CBR256 mp3 will produce same results as VBR forced to
use
> C> only 256 frames... and it isn't, CBR is perfect and VBR does errors.
> C> Well, look at this page - http://www.mageo.cz/home/CASTER/lame.html and
see
> C> what i found, I made it now, very quick so there are not all the tests
i've
> C> done...
> C> And last thing, my friend now managed to reproduce my test (generated
his
> C> own file with CEP, encoded as I did and it was same as by me)
>
> Ok, I did the test myself with your 20-20000logsweep. What I found:
>
> LAME -b256 -mj -h : perfect up to 20kHz, both graph and sound
>
> LAME -b256 -ms -h : perfect up to 20kHz, both graph and sound
>
> LAME -V1 -b128 -mj -h : dB's drop after 15kHz instead of 20, but
> _sounds ok_.
Can you send me picture your frequency analysis of this? What I saw in my
analysis was not just "dB's drop after 15 khz" and it didn't sound ok....
the graph is on http://www.mageo.cz/home/CASTER/lame.html
>
> LAME -V1 -b256 -B256 -mj -h : indeed _audible_ chirp at the end of the
> sweep ("encoding glitch") - nice catch
>
> LAME -V1 -b256 -B256 -ms -h : indeed _audible_ chirp at the end of the
> sweep ("encoding glitch") - nice catch
>
> LAME -V1 -b256 -mj -h : indeed _audible_ chirp at the end of the
> sweep ("encoding glitch")
>
> LAME -V1 -b224 -B224 -mj -h : indeed _audible_ chirp at the end of the
> sweep ("encoding glitch")
>
> LAME -V1 -b192 -B192 -mj -h : indeed _audible_ chirp at the end of the
> sweep ("encoding glitch")
>
> LAME -V1 -b160 -B160 -mj -h : indeed _audible_ chirp at the end of the
> sweep ("encoding glitch")
>
> LAME -V1 -b128 -B128 -mj -h : indeed _audible_ chirp at the end of the
> sweep ("encoding glitch")
>
> So my conclusion: CBR ok, VBR -bX -BX _has_ glitch, -V1 -b128 = no
> audible difference, no glitch.
>
> Thus, bug in Lame VBR if minimum bitrate = maximum bitrate, but no
> general VBR flaw.
>
> btw MT: lol about the "LAME3.82..." padding bits :)
>
> --
> Best regards,
> vdbj mailto:[EMAIL PROTECTED]
>
>
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>
>
>
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