[opus] opusenc for ambisonics?

[Andrew Allen]

Hi Marc,

In order to use the ambisonics API, if you haven't already, you will need
to activate the enable_ambisonics build flag during configuration.
Then, when encoding the file, make sure to manually select mapping family 3
since opus does not auto-detect ambisonic files.

Let me know if you have any questions!

Cheers,
Andrew

On Tue, Dec 17, 2019 at 7:16 PM Marc Lavallée <marc at hacklava.net> wrote:

> I compiled the latest (git master) of opus, libopusenc, opusfile and
> opus-tools:
>
> $ opusenc --version
> opusenc opus-tools 0.2-8-g4976421 (using libopus 1.3.1-4-gad8fe90d)
>
> I tried to encode a 3rd order Ambisonics wav file with the standard
> Ambix (ACN-SN3D) format; opusinfo is reporting :
>
> Streams: 16, Coupled: 0
>     Channel Mapping Family: 255 Map: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
> 11, 12, 13, 14, 15]
>
> How to encode the file so that the Mapping Family is 3, as suggested
> here ? : https://people.xiph.org/~jm/opus/opus-1.3/
>
> Marc
>
>
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