[Vorbis] Does Ogg Vorbis support 5.1 surround?

[Paul Ellis]

<001b01c47b91$9e0ddec0$9440fea9 at aoldsl.net>
Message-ID: <41133594.3040807 at ellisfoundation.com>

It depends on your source file(s).  Are you going from A VOB (DVD Video
OBject), an AC3 (Dolby Digital), 6 Mono wave files, 3 Stereo Wave
files?  Earlier in this thread I mention going to www.doom9.net and
reading their guides on the subject.  They are pretty good.  It
basically takes one of two programs (they both are related to each
other) BeSweet or OggMachine.  They'll handle all of the afore mentioned
files, and make a 5.1 channel (really 6 channel) Vorbis file.  The
programs are very easy to use.  Google for dspguru and Besweet and you
will find his site or a mirror really easy.  It is free software too.
I'm not sure if it's free as in speech, but it is as in beer for sure.

Paul Ellis

Ken Petty wrote:

>Forgive me..... I am still a newbie, comparitively speaking... but how does
>one go about encoding an ogg vorbis file in 5.1 sound?
>
>
>----- Original Message -----
>From: Paul Ellis <paul at ellisfoundation.com>
>To: <vorbis at xiph.org>
>Sent: Thursday, August 05, 2004 8:39 PM
>Subject: Re: [Vorbis] Does Ogg Vorbis support 5.1 surround?
>
>
>
>
>>On Thu, Aug 05, 2004 at 09:21:22AM -0400, Cory wrote:
>>
>>
>>
>>>As most of you all know, DVD's have 5.1 audio, and I want to preserve
>>>that in my voribs files.  So, to ask the question : Does it support
>>>Surround sound?
>>>
>>>
>>Yes and no. There are two issues here. Vorbis does support 6 channel (or
>>any other number of channels) just fine. So in that sense it works.
>>However, there are currently no tuned modes for 5.1 surround. This means
>>the compression will be less effecient than it could be until someone
>>publishes such modes.
>>
>>The other is that the surround audio on DVD is already compressed with a
>>lossy perceptual codec, so re-encoding that as vorbis will always be
>>lower quality than if you had access to the uncompressed soundtrack,
>>like what music cds give you.
>>
>>Hope that helps,
>>
>>
>
>While this is true, I have found the quality to be quite good.  Of course
>it won't be as good as from source files, but transcoding from MPEG-2 to
>MPEG-4/Divx/Xvid is also lossy, this is all far from best case scenario.
>I would say that when I have encoded material at Q0 (remember this is
>simple speech most of the time) I can't really notice the difference.
>It's not music, so the artifacts seem less audible or perceivable.  Well
>that's my 2 cents.
>
>Paul
>_______________________________________________
>Vorbis mailing list
>Vorbis at xiph.org
>http://lists.xiph.org/mailman/listinfo/vorbis
>
>
>
>
>_______________________________________________
>Vorbis mailing list
>Vorbis at xiph.org
>http://lists.xiph.org/mailman/listinfo/vorbis
>
>
>