- From: Dave Singer <singer@apple.com>
- Date: Mon, 2 Apr 2007 14:46:54 -0700
At 14:40 -0700 2/04/07, Ralph Giles wrote: >On Mon, Apr 02, 2007 at 01:55:38PM -0700, Dave Singer wrote: > >> [...] Does Ogg/Theora have a 'required features' or >> 'required version' in the bitstream? > >Theora doesn't currently have any profiles, and the spec >has no optional decoder features. The only thing that can be >marked explicitly in the header (aside from the normal image >size, framerate, bitrate parameters) is the chroma subsampling. > >[now thoroughly off topic] > >As spec authors, we're not opposed to adding profiles of some >sort, flagged either in the metadata, reserved bits, or in the >"tiny" field of the bitstream version number. An obvious first >example be the VP3-compatible subset currently in common use. > >As far as more complex profiles, people have asked us about >that, but we've been reluctant to declare anything without >actual feedback from implementations. If someone does have >a product where they've found a useful dividing point, we'd >like to hear about it. Otherwise we figure people can pick >a resolution and framerate as easily as we can. This sounds roughly as MPEG proceeds (profiles on request), but they get more requests than you do... Yes, this is thoroughly off-topic! -- David Singer Apple Computer/QuickTime
Received on Monday, 2 April 2007 14:46:54 UTC