[opendtv] Re: [MPEG] Re: Growing uncomfortable with Samsung
- From: Ron Economos <k6mpg@xxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Sun, 23 Jan 2005 05:23:13 -0800
What exactly do you mean by "fully conformant"? That an
MPEG-2 decoder should be able to decode /any/ resolution
(for example 592x480 in MP@ML) within the level it's built
for? I don't believe there's a hardware decoder on the planet
that can do that. Nobody in their right mind is going to put all
the required multi-tap upsampling filters into their design to
accomplish that.
Or do you mean the de facto standard horizontal resolutions
of 352, 480, (528 for cable), 544, 640, 704, 720 for SD and
1280, 1440 and 1920 for HD? I don't know where the de facto
horizontal resolutions came from. Certainly not MPEG-2. I'll make
a WAG and say that DirecTV played the biggest part in selecting
the SD resolutions.
Ron
Tom McMahon wrote:
>MPEG puts teeth into nothing; it has never done so, and it will never do so
>(nor does it have anything whatsoever to do with
>licensing terms, by the way).
>
>It was up to the ATSC to voluntarily conform to the full MPEG-2 specification;
>they choose not to do so (which as you point out was
>bad form on ATSC's part). By selecting a subset, they suffer the consequences
>in a world where others have chosen to be fully
>conformant, and MPEG-2 bitstreams cross DTV domain boundaries increasingly
>easily.
>
>-----Original Message-----
>From: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx] On
>Behalf Of Craig Birkmaier
>Sent: Saturday, January 22, 2005 7:55 AM
>
>...
>
>Conformance to the MPEG-2 standard would have been the best approach, but MPEG
>did not put any teeth into conformance.
>
>
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