Mathew wrote:
> > From: "Mark Taylor" <[EMAIL PROTECTED]>
> >
> > > From: "Mathew Hendry" <[EMAIL PROTECTED]>
> > >
> > > Looking at the sampling rate options in FhG's MP3 plugin for Cool Edit
> Pro,
> > > some odd sampling / bitrate choices are offered.
> > >
> > > Bitrates: 18kbps, 20kbps
> > > Sampling rates: 11025Hz, 12000Hz
> >
> > This might be part of MPEG2.5? I believe FhG developed it, but it
> > never became an official ISO standard. But I think most players support
> > it because it is part of the demonstation decoding source?
>
> Yep. A little more scouring reveals that MPEG 2.5 vs. MPEG 2 is like MPEG 2
> vs. MPEG 1 - halved sampling rates and mostly-halved bitrates. But the 8kHz
> sampling rate is not listed by the plugin, and neither are some of the
> bitrates (e.g. 4kbps). Perhaps most useful for very low bitrate voice
> material?
>
> -- Mat.
MPEG2.5 is MPEG2 with halved sampling rates and SAME bitrates. So the
smallest possible bitrate will be 8kbps. To achieve some odd bitrates
like 20kbps, you have to alter 16/24 kbps frames.
Robert
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