[opendtv] Re: ASF for VC1
- From: "John Willkie" <JohnWillkie@xxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Wed, 18 May 2005 17:57:12 -0700
latest wm uses rtsp. Of course, these questions are more appropriate for
the wmtalk list, where all three of us are members, and where there is a
simultaneous thread.
It's almost too much for me to keep track of.
John Willkie
----- Original Message -----
From: "Gary Hughes" <ghughes@xxxxxxxxxxxx>
To: <opendtv@xxxxxxxxxxxxx>; "WMTalk" <WMTalk@xxxxxxxxxxxxxxxxxxxxx>
Sent: Wednesday, May 18, 2005 2:30 PM
Subject: [opendtv] Re: ASF for VC1
> > -----Original Message-----
> > From: opendtv-bounce@xxxxxxxxxxxxx=20
> > [mailto:opendtv-bounce@xxxxxxxxxxxxx] On Behalf Of Prashant Desai
> > Sent: Wednesday, May 18, 2005 5:11 PM
> > To: opendtv@xxxxxxxxxxxxx; 'WMTalk'
> > Subject: [opendtv] ASF for VC1
> >=20
> >=20
> > Does the Micosoft's ASF container format have also been=20
> > standardized by SMPTE while standardizing VC1 [ wmv9 ] ?=20
> > =20
> No.=20
> >=20
> > Or all the VC1 products have to use MPEG2 TS ? I am having=20
> > this doubt coz while checking out on various encoders for vc1 / wm9=20
> >=20
> > The o/p card/module is optional and can be in IP Ethernet=20
> > ASF or can be ASI MPEG2 TS ? =20
> >=20
> SMPTE 421M is meant to be transport independent. I've been told that
> the changes between WMV9 and VC1/WMV9.5 were primarily to address the
> need for a clean separation between transport and video payload.=20
>
> SMPTE RP227 will address the mapping of VC1 access units into MPEG-2
> transport streams. It is an adjunct to the standard, but not part of it.
> > =20
> >=20
> > So , is it because SMPTE standards of VC1 says that wmv9=20
> > video must be within MPEG2 TS only ?=20
> >=20
> > =20
> >=20
> > The only concern is .. say if someone deploys low end WM9=20
> > based solution from Microsoft today , will he be able to migrate to=20
> >=20
> > High end telco grade VC1 based solution later on ? that too=20
> > without much
> > of an hassle since VC1 and wmv9 is exactly same ? assuming=20
> > that audio codec would remain the same After migration ?=20
> >=20
> I would not make that assumption. I do not know the details of the
> transport used by WM9 servers.
>
> gary
>
> Gary Hughes
> Director of Media Engineering
> Broadbus Technologies, Inc.
> ghughes@xxxxxxxxxxxx
> v: 978 264 7919
> f: 978 264 9108
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