I am little confused over what Vorbis I specification states and ogg logical and physical bitstream overview document.( http://xiph.org/vorbis/doc/oggstream.html) I am quoting here the Vorbis I specification "The Ogg/Vorbis I specication currently dictates that Ogg/Vorbis streams use Ogg transport streams in degenerate, unmultiplexed form only. That is: *A meta-headerless Ogg le encapsulates the Vorbis I packets .* *The Ogg stream may be chained, i.e., contain multiple, contigous logical streams* *(links).* * The Ogg stream must be unmultiplexed (only one stream, a Vorbis audio stream,* *per link)* This is not to say that it is not currently possible to multiplex Vorbis with other media types into a multi-stream Ogg le. At the time this document was written, Ogg was becoming a popular container for low-bitrate movies consisting of DivX video and Vorbis audio. However, a 'Vorbis I audio le' is taken to imply Vorbis audio existing alone within a degenerate Ogg stream. A compliant 'Vorbis audio player' is not required to implement Ogg support beyond the specic support of Vorbis within a degenrate Ogg stream (naturally, application authors are encouraged to support full multiplexed Ogg handling). " Now the Vorbis I specification states only about chaining and no grouping but ogg logical and physical bitstream overview document states about grouping. My best guess is that grouping is allowed recently and is something introduced to support video multiplexing. Please help me knowing what kinds of video formates we support within ogg container. My best guess is theora only. Is there possibility of Vorbis being multiplexed with other video coding formats outside ogg container. Vorbis I specification says that @ low bit rate audio we can multiplex with video in Divx format. The reason why i am asking this question is because i am trying to have an implementation with the ogg container decoding part of regular Vorbis decoder. To my understanding we have only theora as the video format within ogg format which i think is true ? Please let me know if it is not. Otherwise we have to go in the normal way to do container and stream decoding at different layers. thanks, Pankaj -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.xiph.org/pipermail/vorbis/attachments/20100727/c2c2efc4/attachment.htm