[theora-dev] first keyframe number ?

[Conrad Parker]

2008/11/11 Ralph Giles <giles at xiph.org>:
> On 10-Nov-08, at 8:08 PM, salsaman wrote:
>
>> what is the number of the first *real* keyframe/frame in a theora
>> stream ? Is it 0 or 1 ?
>
> The first frame of the stream (if it hasn't been trimmed) is a
> keyframe. It is displayed between time = 0 and time = 1 * frame_rate.
> The granulepos for that frame is based on the count of frames after
> it's been shown, which is 1, not zero. The only Ogg pages in a theora
> stream with a 0 granulepos should be the headers.

added to http://wiki.xiph.org/index.php/OggTheora

K.