Re: AAC VBR and CBR

It might be easier to detect problems if you also posted a clean version - 
the mp3 or one of the other mp4's.

Are you having the same problem with other albums?

At 06:21 PM 5/14/2003 -0600, Gordon Harris wrote:
> >I haven't had that problem.
>
> >Which version of Nero are you using - 5.5.10.0, 5.5.10.28, other?  Do you
> >hear the "tweadle" on you computer or just on the ipod?
>
>The Nero version is 5.5.10.28.  The AAC plug-in versions are:
>
>aac.dll: 2.0.0.0
>aacenc32.dll: no version info
>acmp32.dll: 1.0.0.1
>
>(All this was downloaded from Ahead just yesterday.)
>
>I just re-encoded using the Nero AAC encoder at "normal:high" with Encoder
>Quality set to "High" and AAC profile set to LC (just to make sure I hadn't
>messed up before.)
>
>I can't really hear the "tweadle" when playing back the MP4 through Winamp2.
>My computer is frankly too loud to do any serious listening at the machine.
>And my (yuck) Creative Live 5.1 sound card does too much monkeying around
>with the sound anyway.
>
>But, I just did a quick alternate test:  I used Nero to "de-encode" it's MP4
>file back to a WAV file.  I then burned the original WAV and the de-encoded
>WAV to an audio CD and listened on my stereo, using AKG K240 Studio (cheap
>version) headphones.  The "tweadle" is definitely there, and definitely not
>there in the original WAV.
>
>Transferring the newly encoded MP4 (m4a) to the iPod, I again heard the
>"tweadle," this time listening using Etymotic ER-4P earphones.  The
>"tweadle" is as plain as the big 'ol nose on my face.
>
>I've posted the first 1'40" of this artifactual "nero normal" M4A file at:
>http://santafe6.santamedia.com/AACTest/NeroNormalTest.m4a
>
>To my ears, the artifacts are most audible at about 1 minute in.  The file
>is 1.3 mb and I'll leave it there for 24 hours.
>
>
>
>-----Original Message-----
>From: richard [mailto:[email protected]]
>Sent: Wednesday, May 14, 2003 5:13 PM
>To: [email protected]
>Cc: [email protected]; [email protected];
>[email protected]
>Subject: Re: [ephpod] Re: AAC VBR and CBR
>
>
>I haven't had that problem.
>
>Which version of Nero are you using - 5.5.10.0, 5.5.10.28, other?  Do you
>hear the "tweadle" on you computer or just on the ipod?
>
>
>At 04:54 PM 5/14/2003 -0600, Gordon Harris wrote:
>
> >I've done some non-blind testing with the Nero AAC encoder vs. PsyTel
> >aacenc_mpeg4.exe V2.15.
> >
> >My test track was track 2 from "Quotation of Dream" by Toru Takemitsu,
> >Deutsche Grammophon 453 495-2.
> >
> >The recording (I think) was from a live performance.  Scoring is for two
> >pianos, percussion & orchestra.  The dynamics seem to be mostly P down to
> >PPPP.
> >
> >The track was extracted to a WAV via EAC and converted to Mp3 with Lame,
> >M4As with PsyTel, Nero and QTpro 6.1 and all were xfered to my winpod via
> >Ephpod 2.70a.
> >
> >In EVERY encoding I tried with the Nero AAC encoder (normal, extreme,
> >audiophile, transcoding ultra, all at high quality) the resulting M4A had a
> >more or less (but always audible) "tweadle" in the background when played
>on
> >the iPod...which I assume is an encoding artifact (as opposed to a decoding
> >artifact, I guess.)  Neither Lame or PsyTel seemed to suffer from this
> >artifact with this track.
> >
> >Anyone else hearing things that shouldn't be there with the Nero AAC
> >encoder?
>


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