[vorbis] encoding bitrates, different machines...

[Alan MacDonald]

My guess is your bitrate varience has nothing to do with vorbis, its
probably in the ripping, files can vary greatly depending on how you rip
them, if its a crappier rip you'll most likely see higher bit rates.

Later,
Alan

> -----Original Message-----
> From: owner-vorbis at xiph.org [mailto:owner-vorbis at xiph.org]On Behalf Of
> Hugo van der Merwe
> Sent: Thursday, April 11, 2002 3:14 AM
> To: vorbis mailing list
> Subject: [vorbis] encoding bitrates, different machines...
>
>
> I found I have ripped the same CD twice with different machines. Cannot
> remember when, why, or how, but anyway. I've been using jack, here is
> relevant output:
>
> first one:
>
> 01/|\enc/|\128/|\[coding @0.67× done,129kbit]
> 02/|\enc/|\128/|\[coding @0.69× done,124kbit]
> 03/|\enc/|\128/|\[coding @0.66× done,124kbit]
> <etc>
>
> second one:
>
> 01/|\enc/|\128/|\[coding @5.50× done,116kbit]
> 02/|\enc/|\128/|\[coding @2.24× done,120kbit]
> 03/|\enc/|\128/|\[coding @1.40× done,121kbit]
> <etc>
>
> Note the big difference in bit rate... both is RC3. My best guess at the
> moment is that the former was with a -b setting while the latter was
> with a -q setting. I usually do everything at -q, but it might be that I
> forgot to do so with the former.
>
> It won't be different CPU's (P2 vs. AMD Athlon), would it? There's no
> CPU specific optimisations yet, e.g. selecting 3dnow instructions for
> the latter.
>
> Does 129 and 124kbit look about right for a -b setting, does one get
> that kind of range? Here I'm missing that "encoding parameters" tag.
> Hehe.
>
> Both have:
>
> bitrate_upper=none
> bitrate_nominal=128031
> bitrate_lower=none
>
> Thanks,
> Hugo
>
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