[theora] Decoding Theora: Number of frames?
msmith at xiph.org
Tue May 4 09:58:19 PDT 2010
On Tue, May 4, 2010 at 7:27 AM, Stefan Weber <s_weber at blyth.ch> wrote:
> Hi all
> I'm currently writing a decoder for Ogg Theora videos.
> Since I'd like to show the progress of the video, I need to know how to
> read the current (with granulepos?) and total number of frames from the
> Theora header.
> I didn't find an appropriate field in the header specifications for the
> total number.
Theora is designed as a streaming format; there is no mandatory header
with this information. There is now a specification for an Ogg Index
which has index information that can presumably give you this, but
that isn't commonly found in real-world files yet.
Instead, you'll need to seek to the end of the file, find the final
page of the theora stream, and use the granulepos from this page to
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