Hi I read in http://grahammitchell.net/writings/vorbis_intro.html> Ogg Vorbis files support "bitrate peeling", which means you can produce > a lower bitrate file from a higher bitrate file without re-encoding and > at the same quality as if you'd encoded the file directly into the lower > bitrate from the original file. No other lossy audio codec currently > supports this.This is very interesting for multi rate streaming. I think I read most of the Ogg/Vorbis docs with RC3 but didn't any info on it. Where can I find info on how to do this (maybe with an example in C) ? --PMM --- >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.
On Mon, 1 Jul 2002, Peter Maersk-Moller wrote:> This is very interesting for multi rate streaming. I think I read most > of the Ogg/Vorbis docs with RC3 but didn't any info on it. > > Where can I find info on how to do this (maybe with an example in C) ?AFAIK, there are no programs for doing this yet (I did hear a rumour of an experimental tool that allegedly wasn't that great). The developers have said for some time now that while streams pre 1.0 would *support* peeling, there wouldn't be any tools for actually doing it till after 1.0. It will happen though, I'm sure icecast will get peeling support pretty quickly, for example. Geoff. <p><p><p> -- Geoff Shang <gshang@uq.net.au> ICQ number 43634701 Make sure your E-mail can be read by everyone! http://www.betips.net/etc/evilmail.html Please avoid sending me Word or PowerPoint attachments. See http://www.fsf.org/philosophy/no-word-attachments.html <p><p>--- >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.
I'm sure this question gets ask a lot, but here it is again.... What is the status on the tool(s) to perform bitrate peeling? This is perhaps the holy grail that will make ogg vorbis THE compressed audio standard. Why does nobody seem to realize this? <p><p> -- Jim Hines Redhat Linux v8.0 Athlon XP-1700+ --- >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.
>I'd hate to act lame or something, but what exactly is bitrate peeling?Bitrate peeling is taking an existing high bitrate stream and "peeling" away the higher resolution data to result in a lower bitrate stream WITHOUT re-encoding. imagine this (very simplified): Nhe OGG audio stream can be imagined as BASEinfo + lowq + mediumq + highq, where the q's are the resolution data. now, take away the highq and you have a smaller stream of (BASEinfo + lowq + mediumq) Myles --- >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.
Hi>>BTW, has anyone tried MPEG4IP, with the Ogg Vorbis support? That uses >>RTSP. What clients support this? > As far as I know, none (no major players, anyway - MPEG4IP probably > has a client they use for testing?).The player (client) of MPEG4IP supports this. That's the only one for now - I think. However both the server and the client implements Jacks draft for streaming Vorbis over RTP so if anyone implements his draft, it should (except for the loose ends) be compatible. So far the Vorbis support for MPEG4IP isn't supported on non Unix platforms, but making it work on MS is mostly a question about writing the right project file for this damn Visual Studio monster. I can do so for money, but not many has money :( Next version is BTW soon due for release and will implement Jacks draft more correctly. --PMM ----------------------------------------------------------- Peter Maersk-Moller ----------------------------------------------------------- Ogg/Vorbis support for MPEG4IP and YUV12, XviD, AVI and MP4 for libmpeg2. See http://www.maersk-moller.net/projects/ ----------------------------------------------------------- --- >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.