[theora-dev] Ogg MIME types scheme

[Dan Miller]

first,
 
My deepest apologies for another HTML posting.  Hopefully it will be the last.
 
>So, just to confirm, we will be able to take this footage and convert it
to Ogg Theora down the road right?  This is pretty important to us, to
be able to archive all this video patent-free without having to
transcode it down the road..
This is an important question. I cannot answer categorically since in the end it is up to Xiph (Monty) to ensure that this remains the case. However my understanding is as follows: the intention is to make Theora 1.0 'upwards compatible' with VP3. What I mean by that is that a VP3 bitstream can be _losslessly_ converted into a Theora stream (but not necessarily vice versa). While some configuration bits and headers will change, the decompressed data will be 100% identical to what you would get with the original file, and the datarate will be almost exactly the same (a few K of global header, and perhaps a few bytes per frame may be added).

Note however that the tool that does this conversion needs to be created by someone. The documentation will make it possible, and I will make a personal commitment to support anyone involved. I may even build the tool myself, but I don't want to make a blanket commitment at this point as I have no idea what my situation will be when the time is right to do it.  Also my experience is more with AVI files; I assume this is a Quicktime thing.

However I think it's critical for us to confirm that this is technically possible without superhuman effort. The way things stand right now, that's definitely the case. The only thing that could change the situation would be some major monkeying deep in the Theora/VP3 coder, and at this point that is not anticipated prior to the first official release.

-dbm

        -----Original Message----- 
        From: Arc [mailto:arc at indymedia.org] 
        Sent: Fri 2/14/2003 1:47 AM 
        To: theora-dev at xiph.org 
        Cc: 
        Subject: Re: [theora-dev] Ogg MIME types scheme
        
        

        On Fri, Feb 14, 2003 at 05:38:56PM +1100, Conrad Parker wrote:
	>
	> http://www.iana.org/assignments/media-types/application/
	>
	> scroll down to 'ogg'; it doesn't have an RFC number yet
	> (currently RFC-walleij-ogg-mediatype-08.txt) but it'll get
	> one soon (so I hear :)
        
        Awesome timing.
        
        For anyone that's interested, I'm going to spam this out here.. the
        IMC-NYC video team is going to be encoding all of the Feb 15th war
        protest footage in VP3, most of the audio is going to be archived in Ogg
        Vorbis, and there's going to be a live breaking news Quicktime/VP3 video
        stream accompanied by a Ogg Vorbis audio stream (same as video, but
        lower bitrate).  All this is being done in anticipation of being able to
        upgrade the archives to Ogg Theora down the road.. nyc.indymedia.org for
        URLs, if you're interested in what's happening in the streets of NYC
        this weekend.
        
        So, just to confirm, we will be able to take this footage and convert it
        to Ogg Theora down the road right?  This is pretty important to us, to
        be able to archive all this video patent-free without having to
        transcode it down the road..
        
        --- >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 at 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: 6639 bytes
Desc: winmail.dat
Url : http://lists.xiph.org/pipermail/theora-dev/attachments/20030214/2bf650e6/winmail-0001.bin