[theora-dev] Theora Data Dump?
theoradev at tonyobryan.com
Sat Feb 20 11:05:49 PST 2010
On Saturday February 20 2010, Timothy B. Terriberry wrote:
> Not that I know of. I've considered adding an example like this as an
> appendix to the spec, but never found the time.
While writing my decoder, I posted some of the data structures I've read from
the first 320x240.ogg example file, and which match the numbers read by the
dump-video program, to the theora mailing list. I can repost them here if
you'd like to include them in a future appendix.
> Please let us know if you find areas of the spec unclear, or have other
> specific questions that are not answered in it.
Section 6.4.3 of the specification (Computing a Quantization Matrix) says:
1. Assign qri the index of a quant range such that
qi >= summation from qrj=0 to qri-1 (QRSIZES[qti][pli ][qrj ])
qi <= summation from qrj=0 to qri (QRSIZES[qti ][pli ][qrj ])
How do I determine which qri to select so that qi will fall between the
specified value range? Or will a valid Theora file always result in a summation
that automatically satisfies that requirement, regardless of which qri I
More information about the theora-dev