AW: AW: [vorbis-dev] PlusV algorithm -> CBR

[Hannes]

Hi, 

<p>> -----Ursprüngliche Nachricht-----
> Von: owner-vorbis-dev at xiph.org [mailto:owner-vorbis-dev at xiph.org]Im
> Auftrag von Michael Smith
> Gesendet: Sonntag, 2. Februar 2003 06:56
> An: vorbis-dev at xiph.org
> Betreff: Re: AW: [vorbis-dev] PlusV algorithm -> CBR
> 
> 
> On Thursday 30 January 2003 03:16, Dan Miller wrote:
> > fwiw, there are definitely applications that would use 
> Vorbis but can't
> > until there is a _strict_ CBR mode.  Meaning, 
> architecturally the datarate
> > simply cannot exceed X no matter what happens to the 
> quality.  Send silence
> > if you have to, but limit the datarate.
> 
> Dan,
> 
> In situations like this, how is bitrate measured? When you 
> say "cannot exceed 
> X no matter what", what time-period is this over? Since vorbis is a 
> block-based codec (as are many others, including mp3), it's 
> essential to 
> specify some time window - even if that's just a single block 
> (but note that 
> since there's more than one block size, even that can be problematic).

good conclusion, exactly to the point. I think, everyone here can live with a VBR codec, if at least you can make sure that within a certain window Y (be it seconds, or bytes of coded output) my desired datarate X is not exceeded. Which brings my to the next point..
 
> Nobody seems to want to say what they actually MEAN by "CBR".

Jup, I apologize on my part, as I titled my initial question "CBR". As stated above, I am just looking for a codec interface that can guarantee a maximum datarate X every (smallest possible) interval Y. Smallest possible, because datarate control adds up on the codec latency (in multiples, presumably). CBR, for me, is a rather hard restriction on a codec, which do not intend to force on vorbis, once I have a reliable upper boundary for bitrate. If I'd really like to fill my channel to a given datarate (why would I, for streaming?) I can still fill the packets with zeros, or whatever. For my part is says: "the less, the better, I just need consistency in time"
 
> Mike
> 

Hannes

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