[vorbis-dev] Patch for bitrate information in ogginfo

[Gian-Carlo Pascutto]

----- Original Message ----- 
From: "Hongli Lai" <hongli at telekabel.nl>
To: <vorbis-dev at xiph.org>
Sent: Tuesday, July 31, 2001 1:03 PM
Subject: Re: [vorbis-dev] Patch for bitrate information in ogginfo

> On 2001.07.30 15:42:53 +0200 Michael Smith wrote:
> What is mode AA?

Internally the (beta4) encoder doesn't really work with bitrates
but with encoding modes which are set up so that on average they
approach a certain bitrate.

The beta4 encoder switches between modes based on the bitrate 
given. Although you can supply any requested bitrate, it will
still be limited to those 6 modes.

mode AA = +-  96kbps
mode A  = +- 128kbps
mode B  = +- 160kbps
mode C  = +- 192kbps
mode D  = +- 256kbps
mode E  = +- 350kbps

> And is there any way to tell Vorbis to use as much bits as it needs?

It already does. The encoding modes differ in preecho sensitivity, 
noise and masking levels, used codebooks etc... they are all lossy,
but the encoder uses as many bits as needed to encode the parts that
remain.


-- 
GCP

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