[vorbis] Mono wavs with b4

[Michael Smith]

>The last sentence means that you should halve those numbers yourself,
>because these values are the 6 modes for stereo input.

No, don't do that. Oggenc (well, actually the code to do that is now in libvorbisenc) does that itself. It doesn't do similar things for different sample rates yet, but it will for 1.0

> A nice side-effect would be the transparent encoding of
>non-44.1kHz waves ... getting ~70kbit/s when using -b 112 is somewhat
>irritating.

As I said, it doesn't scale the bitrate properly for other sample rates, but it will for 1.0. vorbis will produce transparent encoding at that sort of bitrate for lower sample rates - but right now, it's completely untuned for other sample rates, so quality suffers. The -m option was removed in favour of a more accurate -b, but some of the backend work in libvorbis to make this a complete solution isn't done yet.

>Then, there's something else I don't understand. Quoting
>http://www.xiph.org/ogg/vorbis/: "[...] for high quality (44.1-48.0kHz,
>16+ bit, polyphonic) audio and music at fixed and variable bitrates from
>16 to 128 kbps/channel."

The design is tuned for these bitrates - the current encoder is more limited at the lower end, and can produce higher bitrates as well. There's no hard limit to the max or min bitrate allowed.

Michael

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