[vorbis-dev] Re: Re: How is 6 channels coupling made?

Tim Ivorson tim.ivorson at mailandnews.com
Tue Sep 10 02:26:12 PDT 2002

>> > unfortunately there is no channel coupling used at all when doing 6
>> ch Vorbis encodings, thats why files are currently bigger than they
>> should
> be
>> Thanks for telling.
>> This makes things easier for me: it's safer to patch the bug like this
>> Just curious: is there any channel coupling when encoding 2ch (stereo)
>> ?
> Of course there is, depending on q level. For q > 5 lossy mode is
> disabled, thats why from 4.99 to 5.0 there is a rather huge jump in
> bitrate.

Where the input sound is ac3, is using 6-channel vorbis really preferable to 
using high quality mono vorbis or not converting the sound at all (given the 
oposition in the ogg community to reencoding)?

Does ac3 use lossy channel coupling?

I imagine that the bass channel is encoded differently to the others. How is 
it encoded?

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