Re: [Audacity-devel] Multi-Track Compressed Audio

[Martyn S. <mar...@gm...>]

Hi

You can't be the only person to have thought of this.  In Audacity try 
to Export... a 5 channel wav file as an FFmpeg-compatible or an Ogg 
Vorbis file, you should be able to import it again, proving concept.

HTH
Martyn

On 12/08/2010 04:32, Bob Ingraham wrote:
> Hello Gurus,
> I think the answer is "no", but I'd like the experts' opinion:
> I am developing a multi-track recording app in Java.
> What I have written so far can capture from multiple source and create a
> multi-channel (like 4 or 8 channel) WAV file containing uncompressed
> LPCM samples.
> The idea is to be able to open, for example, one of my 8-channel WAV
> files and allow the user to pick any combination of the 8 channels to
> down-mix and play back on a typical stereo output (using my custom WAV
> file reader/down-mixer/renderer Java app.)
> Since I'm more concerned with saving disk space than working with
> "lossless" audio, I've research if there are any extant codecs and
> container file formats that can accomodate (i.e., compress and store,)
> more than two channels per stream.
> But, from what I've read, I don't think either the Vorbis or MP3
> codecs seem setup to handle more than 2 channels (stereo) in the codec
> or the container formats (Ogg/MP3).
> Is this correct?
> If I want to independently compress 4+ channels (i.e., unmixed,
> interleaved-or-planar samples,) and store them in one container file, is
> like u-Law in a WAV container the only off-the-shelf way I can do this?
> I thought about compressing the channels separately, and storing the
> compressed streams in my own file format, with indexing, so I can keep
> all channels "gen-locked" to facilitate time-accurate seeking and
> selective channel re-mixing for playback, but I don't want to re-invent
> the wheel, if such a wheel exists.
> Or maybe I'm just stupid and thinking about this the wrong way.
> Any pointers would greatly appreciated.
> Bob
>
>
>
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