Hi all, I recently started to study the Ogg Vorbis codec and found an interesting feature called bitrate peeling [1]. Do you know where I can find more information on this topic? E.g., how is the actual peeling being implemented, what are the performance results in terms of resulting quality, what are the requirements for bitrate peeling (can it be applied to any ogg vorbis stream), ...? Also, currently I am using the latest Ogg vorbis encoder from [2]. Are you aware of any support for bitrate peeling options of this encoder? [1] http://en.wikipedia.org/wiki/Bitrate_peeling [2] http://downloads.xiph.org/releases/vorbis/ Thanks and best regards, Davy -- Davy Van Deursen Ghent University - IBBT Department of Electronics and Information Systems Multimedia Lab URL: http://multimedialab.elis.ugent.be
The official encoder does not, to the best of my knowledge, implement peeling. Through the years I have heard of two peeling demos from third-parties, none of them ever achieving better quality than the plain encoder. Guess they either didn't hit the right spot, or peeling will stay an interesting theory that just can't be implemented in the real world -- I don't know. I suspect if you search the past archives of this and the vorbis-dev mailing list, or maybe in older Hydrogenaudio.org posts you'll find what you want. -Ivo On 12/13/08, Davy Van Deursen <davy.vandeursen at ugent.be> wrote:> Hi all, > > I recently started to study the Ogg Vorbis codec and found an interesting > feature called bitrate peeling [1]. Do you know where I can find more > information on this topic? E.g., how is the actual peeling being > implemented, what are the performance results in terms of resulting quality, > what are the requirements for bitrate peeling (can it be applied to any ogg > vorbis stream), ...?
On Sat, Dec 13, 2008 at 4:54 AM, Davy Van Deursen <davy.vandeursen at ugent.be> wrote:> Hi all, > > I recently started to study the Ogg Vorbis codec and found an interesting > feature called bitrate peeling [1]. Do you know where I can find more > information on this topic? E.g., how is the actual peeling being > implemented, what are the performance results in terms of resulting quality, > what are the requirements for bitrate peeling (can it be applied to any ogg > vorbis stream), ...? > > Also, currently I am using the latest Ogg vorbis encoder from [2]. Are you > aware of any support for bitrate peeling options of this encoder?Other folks have answered the peeling question. I'm curious: Is peeling still an interesting feature for a lossy codec or is hybrid-lossy/lossless more interesting? (the latter also making possible a kind of cpu-expensive perfect peel by reencoding from the lossless)