Just in case my quotation causeed misunderstnaing... Forget about what I quoted before. Probably, by CBR, Monty meant ABR since CBR is stupidly patented and this is the reason why Vorbis has no CBR option. If you know this, it cannot be a problem but I see there is a question asking what is ABR in the mailing list.>On Thu 28 Jun 2001, 23:27:41 PDT, Monty (xiphmont@xiph.org)Wrote: >then vbr/cbr tuning.Therfore, in RC1, you can expect: 1.Channel coupling or 'Joint Stereo' in mp3 2.VBR Bitrates 3.ABR/VBR tuning options 4.Low bitrate modes ___________________________________________________________________ To get your own FREE ZDNet Onebox - FREE voicemail, email, and fax, all in one place - sign up today at http://www.zdnetonebox.com --- >8 ---- List archives: http://www.xiph.org/archives/ Ogg project homepage: http://www.xiph.org/ogg/ To unsubscribe from this list, send a message to 'vorbis-request@xiph.org' containing only the word 'unsubscribe' in the body. No subject is needed. Unsubscribe messages sent to the list will be ignored/filtered.
> Forget about what I quoted before. Probably, by CBR, Monty meant ABR > since CBR is stupidly patented and this is the reason why Vorbis has > no CBR option.Incorrect. CBR is not patented and Vorbis has no CBR option because it is not natively CBR. MP3 is based on fixed sized frames, Vorbis is not. (MP3 actually implements a limited ABR on top of the fixed size frame option, so CBR is a misnomer for MP3 as well). By 'CBR' I mean 'simulated fixed bitrate within a small window of frames', the same thing it means in MP3 (where the window is nine frames). Monty --- >8 ---- List archives: http://www.xiph.org/archives/ Ogg project homepage: http://www.xiph.org/ogg/ To unsubscribe from this list, send a message to 'vorbis-request@xiph.org' containing only the word 'unsubscribe' in the body. No subject is needed. Unsubscribe messages sent to the list will be ignored/filtered.
> Monty wrote:>>CBR is not patented and Vorbis has no CBR option because >> it is not natively CBR. MP3 is based on fixed sized frames, Vorbis >> is not. (MP3 actually implements a limited ABR on top of the fixed >> size frame option, so CBR is a misnomer for MP3 as well).Oh, sorry for wrong information. I read that one from some where else long time ago and took it naively. Then, techinically, there are no genuine CBR in MP3 or Ogg Vorbis.>> By 'CBR' I mean 'simulated fixed bitrate within a small window offrames', the same thing it means in MP3 (where the window is nine frames). Then, in this limited sense, Beta 1-4 are all 'CBR.' O.K. In that case, In RC 1, are you putting ABR and VBR option in addition to this 'CBR' option of Betas? Or it is just because of this confusing 'lingo'and you are putting only VBR and no ABR? If you are busy, you just igonre this question. We will know the answer anyway when RC1 is released. Segher wrote:> No, it's not 9 frames, it's 4095 octets. Maximum backward frames > needed is nine frames, yes.There is always a bigger fish, isn't it? ;-) ___________________________________________________________________ To get your own FREE ZDNet Onebox - FREE voicemail, email, and fax, all in one place - sign up today at http://www.zdnetonebox.com --- >8 ---- List archives: http://www.xiph.org/archives/ Ogg project homepage: http://www.xiph.org/ogg/ To unsubscribe from this list, send a message to 'vorbis-request@xiph.org' containing only the word 'unsubscribe' in the body. No subject is needed. Unsubscribe messages sent to the list will be ignored/filtered.