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_.
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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