Hello everyone! Please bear with me, I am a complete audio-newbie, and I apologise if I am asking a question that I should know. 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? Thank you very much!
I'm a newbie too, but I've just take a look at the code, and Ogg Vorbis support 256 channels, so it may support 5.1 sound. Elsewhere, a well-known advantages of Ogg versus MP3 is that it can encode more than 2 channels. Franck -----Original Message----- From: vorbis-bounces@xiph.org [mailto:vorbis-bounces@xiph.org] On Behalf Of Cory Sent: jeudi 5 ao?t 2004 15:21 To: vorbis@xiph.org Subject: [Vorbis] Does Ogg Vorbis support 5.1 surround? Hello everyone! Please bear with me, I am a complete audio-newbie, and I apologise if I am asking a question that I should know. 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? Thank you very much! _______________________________________________ Vorbis mailing list Vorbis@xiph.org http://lists.xiph.org/mailman/listinfo/vorbis --- Incoming mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.734 / Virus Database: 488 - Release Date: 04/08/2004 --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.734 / Virus Database: 488 - Release Date: 04/08/2004
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, -r
Type oggenc -h, and you can see the option -C which permit to tell oggenc how many channels you want (default : 2 channels, i.e stereo). But I think you must put exactly the number of channels supported by your 5.1 sound, elsewhere oggenc will tell you he can't encode (because he can't read the source if the channel number is wrong). So you have to look for 5.1 sound specs to know how many channels you have to put in -C option. And no doubt, Ogg Vorbis is the best format :o) Good lucks, Franck -----Original Message----- From: Cory [mailto:kiweki@gmail.com] Sent: jeudi 5 ao?t 2004 18:02 To: Franck Charlemagne Subject: Re: [Vorbis] Does Ogg Vorbis support 5.1 surround? Oh, ok, thank you! So, are you sure it can? If so, is there any option I have to set. Or, will it recognize the multi-channel file and do it's thing accordingly? Thanks again. On Thu, 5 Aug 2004 16:36:56 +0200, Franck Charlemagne <fcharlemagne@workit.fr> wrote:> I'm a newbie too, but I've just take a look at the code, and Ogg > Vorbis support 256 channels, so it may support 5.1 sound. Elsewhere, a> well-known advantages of Ogg versus MP3 is that it can encode more > than 2 channels. Franck > > > > > -----Original Message----- > From: vorbis-bounces@xiph.org [mailto:vorbis-bounces@xiph.org] On > Behalf Of Cory > Sent: jeudi 5 ao?t 2004 15:21 > To: vorbis@xiph.org > Subject: [Vorbis] Does Ogg Vorbis support 5.1 surround? > > Hello everyone! > > Please bear with me, I am a complete audio-newbie, and I apologise if > I am asking a question that I should know. > > 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? > > Thank you very much! _______________________________________________ > Vorbis mailing list > Vorbis@xiph.org > http://lists.xiph.org/mailman/listinfo/vorbis > > --- > Incoming mail is certified Virus Free. > Checked by AVG anti-virus system (http://www.grisoft.com). > Version: 6.0.734 / Virus Database: 488 - Release Date: 04/08/2004 > > --- > Outgoing mail is certified Virus Free. > Checked by AVG anti-virus system (http://www.grisoft.com). > Version: 6.0.734 / Virus Database: 488 - Release Date: 04/08/2004 > >--- Incoming mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.734 / Virus Database: 488 - Release Date: 04/08/2004 --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.734 / Virus Database: 488 - Release Date: 04/08/2004
5.1 content? No, but I do have some 45-64 content at http://www.ellisfoundation.com/freemusic Paul Ellis Igor V. Nikitkov wrote:>Hi all, > >Does anybody knows URLs with representative vorbis coded musical content >(preferably middle and low bitrate)? > >Thanks, > >Gary > > >_______________________________________________ >Vorbis mailing list >Vorbis@xiph.org >http://lists.xiph.org/mailman/listinfo/vorbis > > >
RESEND: Why doesn't the mailing list default to vorbis@xiph.org for the reply-to address? It drives me crazy. Go to http://dspguru.doom9.net/ and get Besweet. It will take just about anything and make a 5.1 (really a 6 channel) Vorbis file. But if you want it in a movie like that I think your only option is to use .OGM as your video container, that can be found at http://tobias.everwicked.com/. And there are some good guides at http://www.doom9.net under the audio section on how to do all of this. I've taken some of my DVDs and compressed them down with Divx/Vorbis into an OGM file so that I can fit more on my laptop hard drive and it works quite well. I get encode 5.1 Vorbis with hardly any higher total bitrate than for stereo MP3. Of course it helps when most of the time most of the channels are silent. Although having 5.1 on my laptop doesn't make a world of difference, but I figured it didn't take any more time to do it that way, and that way if I ever uploaded them to my Xbox I could watch the movies with surround sound from it. Paul Ellis Cory wrote:>Hello everyone! > >Please bear with me, I am a complete audio-newbie, and I apologise if >I am asking a question that I should know. > >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? > >Thank you very much! >_______________________________________________ >Vorbis mailing list >Vorbis@xiph.org >http://lists.xiph.org/mailman/listinfo/vorbis > > >
<20040805160610.GA25377@ghostscript.com> Message-ID: <4066.144.37.177.95.1091763558.squirrel@www.ellisfoundation.com>> 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
<001b01c47b91$9e0ddec0$9440fea9@aoldsl.net> Message-ID: <41133594.3040807@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@ellisfoundation.com> >To: <vorbis@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@xiph.org >http://lists.xiph.org/mailman/listinfo/vorbis > > > > >_______________________________________________ >Vorbis mailing list >Vorbis@xiph.org >http://lists.xiph.org/mailman/listinfo/vorbis > > >