[vorbis] Bitrate restrictions

[Ed Sweetman]

On Fri, 2002-07-26 at 06:34, Peter Schuller wrote:
> [ Before I start complaining let me just say that I think 1.0 kicks ass
> - great job! ]
> 
> > I don't know what the exact limits are at what bitrates for sample rate..... I 
> > would have assumed there wouldn't be any. (i.e. if you *really* want that 
> > bitrate, you can have it at full sample rate).
> 
> No, and this has bothered me for some time...
> 
> Even now with -1 quality I can't get lower than around 50 kbit on normal
> music (like with RC3, except then I had to do "-b 45" to get that
> effect).
> 
> But the quality is still VERY impressive for that bitrate. I still want
> to be able to choose a much worse quality. Particularly for voice
> communication and the like.

if you want a certain bitrate, why are you using a qualitative setting
and not a bitrate setting ?   maybe for the audio you're encoding -1
quality is up in the 50kbit range.  Have you tried doing -b 40 ?
qualitative settings depend on the source, what you want is a specific
range and there are options for it.  I assume -b is an option in the
oggenc you're using.  

<p> 
> I don't like the idea of *having* to downsample to get lower than a
> specific bitrate, especially not when the codec seems to handle bitrates
> without downsampling down to that limit very well. Downsampling
> effectively puts a cap on the maximum achievable quality regardless of
> how easy the sound is to encode.
> 
> Is there some technical difficulty in encoding at very low quality
> levels? There is obviously some form of hard coded range check. Why?
> 
> -- 
> / Peter Schuller, InfiDyne Technologies HB
> 
> PGP userID: 0xE9758B7D or 'Peter Schuller <peter.schuller at infidyne.com>'
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> 
> 
> 
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