At 11:32 AM -0700 11/23/2010, Tina K. wrote:
Was Blue Ray designed asymmetrically as well?
To clarify Bruce's post...
This has NOTHING to do with the media format. CD, DVD, Blu-Ray...
those are just media, plastic discs that basically emulate
random-access r/o hard drives. It's the codec used to encode/decode
the video and audio data ON the media that's asymmetric.
The basic theory is that playback should always be easy, to allow use
on less expensive hardware. They try to do all the number crunching,
compressions, optimizations, etc, during the encode process, because
that's when the "author" (home user or professional) is going to have
more cpu power available.
As to the primary codec used....
CD-Video is either MPEG-1 or MPEG-2.
DVD-Video is MPEG-2.
Blu-Ray discs use MPEG-2 or MEPG-4 (mostly h.264) or VC-1.
Then there's those players that support DviX DVDs. DivX is simply a
flavor of MPEG-4.
- Dan.
--
- Psychoceramic Emeritus; South Jersey, USA, Earth.
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