[Fwd: Re: [Ffmpeg-devel] Ambisonic decoder]

[Sebastian Olter]

2007/2/28, Alex Beregszaszi <alex at rtfs.hu>:
> Actually that means you only need to write two filters:
> ambisonic_encoder and ambsonic_decoder. Every sane compressor should
> work on the preprocessed data.

It is indeed a good idea to implement the Ambisonic transcoder as a
filter. But when a codec detects the stream as Ambisonically encoded,
the filter (which is always on) should change its behaviour. We can
have 5.1 ITU sources as well as 6ch Ambisonic B-Format. Thus,
interaction between codec and filter is essential.

> Is there a standard ambisonic audio format + codec which is preferred by
> the authors of it? Or it just uses pcm+wav?

Currently they use Microsoft(r) WAVE-EX. See
http://www.ambisonicbootlegs.net for examples. There are also
discussions regarding the incoming Ambisonic Vorbis standard on
vorbis-dev.