[opendtv] Re: Interlace Artifacts
- From: "David Workman (WINDOWS MEDIA)" <dworkman@xxxxxxxxxxxxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Wed, 12 Jan 2005 11:38:34 -0800
>>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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