[opendtv] Re: Interlace Artifacts

OK, if Microsoft ever emits a superset of VC-1 I've saved this Email.  (BTW - 
Isn't Longhorn graphics supposed to support 10 bit
video or has that plan gone by the wayside?)

-----Original Message-----
From: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx] On 
Behalf Of David Workman (WINDOWS MEDIA)
Sent: Wednesday, January 12, 2005 11:39 AM
To: opendtv@xxxxxxxxxxxxx
Subject: [opendtv] Re: Interlace Artifacts

>>There are admittedly bitstreams in the field that will=20 cause SMPTE 
>>VC-1 to go dark.  Wow.

I don't understand why in the world you would have an issue with this.
There would be no benefit for anyone to deploy the old 4:1:1 bitstream.
This bitstream is NOT part of VC-1 and was never intended to be.  There are 
lots of other bitstreams in the world that are not
decodable by VC-1 ... and no one, to my knowledge, has any desire to have VC-1 
decode any of them, either.

>>The SMPTE-standardized VC-1 video codec and it's progeny will=20 
>>always be a subset of whatever Microsoft does. =20

This is clearly untrue and not Microsoft's intention.

>>It is very very important for everyone, especially the press, to 
>>differentiate between Windows Media vX and SMPTE VC-X.

Again, this is untrue.  The intention is for them to be identical.  You would 
not believe the man-months my team has spent ensuring
that the spec, our implementation, and the reference implementation match, and 
also helping third parties so their implementations
match perfectly. =20

>>Microsoft executives predicted that VC-X would be done last=20 
>>September (2004), but the best we're looking at now is later=20 this 
>>year (2005).

Yes, it has taken longer than expected - but unfortunately, this is the nature 
of the process.=20



David Workman
QA Manager
Core Media Processing Technology
Microsoft Corporation


-----Original Message-----
From: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx]
On Behalf Of Tom McMahon
Sent: Wednesday, January 12, 2005 10:06 AM
To: opendtv@xxxxxxxxxxxxx
Subject: [opendtv] Re: Interlace Artifacts

Right.  So Microsoft products can do everything, but SMPTE VC-1 implementers 
may not be able to unless they sign the onerous
cross-licensing, indemnification, developers agreement with Microsoft.
There are admittedly bitstreams in the field that will cause SMPTE VC-1 to go 
dark.  Wow.

And so it will be for future versions (builds) of Windows Media 10 and Windows 
Media XYZ.  The SMPTE-standardized VC-1 video codec
and it's progeny will always be a subset of whatever Microsoft does.  It is 
very very important for everyone, especially the press,
to differentiate between Windows Media vX and SMPTE VC-X.

Embrace and extend embrace and extend.

Even if Microsoft releases future updates (for example 10 bits?) to SMPTE for 
the purposes of documenting public interchange and
interoperability, there will always be a giant time lag.

Microsoft executives predicted that VC-X would be done last September (2004), 
but the best we're looking at now is later this year
(2005).

I guess that's all OK if you carefully control expectations and market segments.

-----Original Message-----
From: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx]
On Behalf Of David Workman (WINDOWS MEDIA)
Sent: Wednesday, January 12, 2005 9:36 AM

The decoders in the Media Player are backwards compatible with all downlevel 
bitstreams.  The 4:1:1 decoder is not part of VC1, but
as far as I know this format has never been deployed outside of the PC 
environment.



=20
=20
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