[theora-dev] Updated VP3 Document
melanson at pcisys.net
Mon Mar 1 10:00:04 PST 2004
On Mon, 1 Mar 2004, Timothy B. Terriberry wrote:
> Especially the one about Theora no longer having the opposite
> orientation that VP3 has (at least in the CVS version).
That does seem important...which versions of Theora have which
> The other comment I'd make is that the DCT tokens are coded in terms of
> Huffman codes. The fact that the VP3 code re-derives the Huffman codes
> corresponding to a set of histograms every time you run it is mostly
> irrelevant. The histograms are fixed (in VP3), and so the codes are
> fixed. In Theora, the codes are specified in the bitstream directly, not
> in terms of a histogram.
Okay, this is good stuff. I will remember to incorporate this when
I revise that section (next on the list, naturally, hopefully tonight).
> Also, I don't remember if anyone ever asked before, do we have
> permission to incorporate pieces of this document (with attribution)
> into our own Theora bitstream spec.?
Hmm, I thought I was writing the Theora bitstream spec...:)
Anyway, sure, go ahead and use it with attribution. I noticed that there
is still a reference in the doc for the GNU Free Documentation License. I
thought I got rid of it, but it's on my TODO list now. The rest of my
documents are GFDL; then again, no one cares about those. If this spec is
useful to you, go ahead and use it.
--- >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.
More information about the Theora-dev