Dan Miller
2003-Jan-02 04:31 UTC
[theora-dev] Re: Ogg Internet Drafts - create application/ogg-vorbis, application/ogg-tarkin, etc.
just for the record -- I think you mean video/theora when you mention vorbis+VP3. Vp3 is becoming Theora. Tarkin is another video codec project at Xiph. As for this whole MIME type issue, can someone enlighten me as to how this problem is addressed with Quicktime, Microsoft, and RealNetworks plug-ins today? Also, does an MPEG4 tag specify which audio codec is used? thanks - dan -----Original Message----- From: Silvia.Pfeiffer@csiro.au [mailto:Silvia.Pfeiffer@csiro.au] Sent: Thu 1/2/2003 5:47 AM To: dwheeler@ida.org Cc: triad@df.lth.se; vorbis-dev@xiph.org; theora-dev@xiph.org Subject: [theora-dev] Re: Ogg Internet Drafts - create application/ogg-vorbis, application/ogg-tarkin, etc. Dear David, I hope it's ok to forward your email to the developer lists. I have not seen a comprehensive scheme for MIME type naming and file extensions for ogg files yet - please anybody put me in the picture if there is. However, I have seen application/x-ogg used for ogg-vorbis files, which is according to MIME type registration rules an unregistered and experimental MIME type (see RFC2048) and seems to have worked so far for ogg-based files. I understand your issues on having application/ogg as an all-encompassing MIME type, as ogg by itself cannot determine the further type of content included. Therefore your idea about having more specific MIME types makes sense. Yet, I don't believe that application/ogg-tarkin or application/ogg-vorbis should be chosen, as "application/" to me flags that the content of the file can only be determined by an application that can read this specific type of file. In my opinion, vorbis should be audio/ogg-vorbis because vorbis itself is an encoding format that makes sense in containers only, such as ogg or rtp. Tarkin on the other hand is a combination of vorbis and VP3 plus a media mapping onto ogg such that video/tarkin might make sense, though would not be logical to the outside world. As for file extensions - I've seen theora files also end in .ogg . Cheers, Silvia. David Wheeler wrote: > > Thanks SO MUCH for creating Internet Drafts; > I cannot begin to tell you how important > it would be to create IETF RFCs for Ogg and Vorbis (and Tarkin, etc.). > > However, I believe there should NOT be a _single_ MIME type for ogg. > After all, it may contain different codecs, and different application > programs may only handle certain codecs. I believe the MIME type > should identify the codec as well as the fact that it's ogg. > > For example, many people have _separate_ applications for audio-only > instead of audio+video. It would be better if they could start the > "right" application using just the MIME type information (instead of > awkward two-stage start-ups that are different than anything else). > At the least, I suspect there is a need to have different MIME types > for audio-only vs. video. > > Also, not all applications can handle all codecs, even if they handle > that kind of media; that would be ESPECIALLY true if Ogg supports multiple > codecs... which it does. > > Thus, I believe the MIME type should identify both Ogg & the codec. > Perhaps an application/ogg-vorbis, application/ogg-tarkin, etc. > You could also register application/ogg (to be used when a more specific > MIME type isn't available). Ideally the standard filename extensions > should be different too; Ogg Vorbis could be ".ogg" since that's become > so common, Ogg Tarkin could be ".ogt", etc. > > Thanks. > > --- David A. Wheeler > dwheeler@ida.org --- >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 'theora-dev-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. -------------- next part -------------- A non-text attachment was scrubbed... Name: winmail.dat Type: application/ms-tnef Size: 7822 bytes Desc: winmail.dat Url : http://lists.xiph.org/pipermail/theora-dev/attachments/20030102/e5615306/winmail-0001.bin
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