[whatwg] on codecs in a 'video' tag.
singer at apple.com
Mon Apr 2 13:33:19 PDT 2007
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.
More information about the whatwg