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From: Doc on 24 Apr 2008 18:44
I've been fooling with creating .flv files for upload to YouTube and I
notice something that I've also noticed using CDex.

Some files seem to response fine to conversion to mp3 at a given bit
rate say 128, but others take on this grainy, burbly artifact unless
you pump up the bit rate.

I ran into this with two tracks off two different albums. Both
professionally recorded yet one has issues and the other doesn't.

Any insights?

Thanks for all input
From: Richard Crowley on 24 Apr 2008 18:50
"Doc" wrote ...
> I've been fooling with creating .flv files for upload to YouTube and I
> notice something that I've also noticed using CDex.
>
> Some files seem to response fine to conversion to mp3 at a given bit
> rate say 128, but others take on this grainy, burbly artifact unless
> you pump up the bit rate.
>
> I ran into this with two tracks off two different albums. Both
> professionally recorded yet one has issues and the other doesn't.

Are they both original PCM files that have never been compressed
at any time during their lifecycle?

The symptoms sound like the kind of artifacts one hears when you
re-compress the audio.


From: Doc on 24 Apr 2008 19:31
On Apr 24, 6:50 pm, "Richard Crowley" <rcrow...(a)xp7rt.net> wrote:

> Are they both original PCM files that have never been compressed
> at any time during their lifecycle?
>
> The symptoms sound like the kind of artifacts one hears when you
> re-compress the audio.


They're both ripped from commercial CD's, so I assume not. Both
handled identically from that point.

From: Mark on 24 Apr 2008 22:24
On Apr 24, 7:31 pm, Doc <docsavag...(a)yahoo.com> wrote:
> On Apr 24, 6:50 pm, "Richard Crowley" <rcrow...(a)xp7rt.net> wrote:
>
> > Are they both original PCM files that have never been compressed
> > at any time during their lifecycle?
>
> > The symptoms sound like the kind of artifacts one hears when you
> > re-compress the audio.
>
> They're both ripped from commercial CD's, so I assume not. Both
> handled identically from that point.

are you getting 15kHz video H sync leaking into the audio during your
post production or whenever..

This extra 15 kHz probably would not be too audible before MP3
compression but might mess up the compression. Check it with a
spectum analyzer.

Mark


From: Danny T on 24 Apr 2008 22:47
On Apr 24, 5:44 pm, Doc <docsavag...(a)yahoo.com> wrote:
> I've been fooling with creating .flv files for upload to YouTube and I
> notice something that I've also noticed using CDex.
>
> Some files seem to response fine to conversion to mp3 at a given bit
> rate say 128, but others take on this grainy, burbly artifact unless
> you pump up the bit rate.
>
> I ran into this with two tracks off two different albums. Both
> professionally recorded yet one has issues and the other doesn't.
>
> Any insights?
>
> Thanks for all input

I'v noticed that things chance too. I did an mp3 of a song I played
live and posted it to myspace and noticed that part of the vocal came
out sounding drenched in chorus. It seems weird to me. I did have some
chorus on my voice but hardly enough to hear. I use it to just widen
things a bit, not to effect my voice. ..... yet there is the chorus
thick as hell..... What the hell, I left it that way - its myspace
after all :-)
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