[opus] Encoding ultrasonics

[Corey Shay]

Well, Vorbis doesn't sound too terrible when pitched down, though,
admittedly we haven't tried it with rates over 48k. It sounds close enough
to the original when pitched down to pass just fine.

On Wed, Jan 16, 2013 at 11:50 AM, Gregory Maxwell <gmaxwell at gmail.com>wrote:

> On Wed, Jan 16, 2013 at 2:45 PM, Corey Shay <cshay892 at gmail.com> wrote:
> > Why use Opus for this? Video games, of course. Memory
> > constraints.
>
> If you use Opus or any other lossy encoder for this you will violate
> their perceptual assumptions and get results that sound like crud. A
> lossy codec (or encoder) could— in theory— be design to work more
> sanely in this use case, but not for the Opus format (because much of
> the encoder's behavior is baked into the format for efficiency
> reasons) and not without substantially compromising the effectiveness
> of the lossy compression.
>
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