At 22:27 +0200 2/04/07, Maik Merten wrote:
Dave Singer schrieb:
are you telling us that all implementations of Ogg and Theora can play
audio and video up to any bitrate, screensize, channel count etc.,
without dropping frames, getting behind, decoding badly, or other
limits? That would be quite an achievement...more impressive than
getting a quart out of a pint pot...
I'd bet that no MPEG implementation can play audio and video up to any
bitrate, screensize, channel count etc. either - the profiles which
define different sets of coding features definately add to the
interoperability complexity in a different way than those factors.
You miss the point. MPEG defines levels exactly so that bitstreams
can say "you need to be level X to be able to play this" and players
can implement "up to level X" and interoperability is well-defined
and assured. Levels *improve* the interoperability, not make it
worse. Without formal level definitions, you never know for sure
what you can 'get away with' in your encodings if you want it to play
on a set of devices.
--
David Singer
Apple Computer/QuickTime
