[opendtv] Re: Pros/Cons of DSP processor based MPEG software decoder or hardware based MPEG decoder
- From: "Tom McMahon" <TLM@xxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Wed, 9 Feb 2005 19:09:43 -0800
I am sorry that there is so much confusion over H.264/AVC terminology. (Note
that I use that precise syntax consistently, and that
I do not say "MPEG-4".)
I am also sorry that the terminology used by our standards bodies is confusing:
"Level" is not the same thing as "Profile".
"Profile" is a set of tools or a class of basic capabilities (toolkit).
"Level" is kinda like pixel rate or horsepower (and
framerate).
I like to explain "Profile" as an off-road package, or luxury package. And I
like to explain "Level" as an engine horespower
package (SDTV versus HDTV). Does that make sense? You can have an off-road
package with two different engines (Levels). Or, you
can have the same basic car (Level) with simple interior OR super luxury
leather (two different Profiles).
"Part 10" does not equal "Level 10"; they aren't related. Mixing Levels and
other stuff is mixing apples and yogurt; they are very
different things. I'll be happy to explain further if you wish.
VC-1 is the to-be-SMPTE-standardized subset of Microsoft's Windows Media video
compression toolkit. VC-1 is being standardized as
the public interoperability and interchange format for Microsoft's proprietary
Windows Media video code format. That documentation
effort is not done yet.
-----Original Message-----
From: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx] On
Behalf Of Ralph P. Manfredo
Sent: Wednesday, February 09, 2005 6:05 PM
To: opendtv@xxxxxxxxxxxxx
Subject: [opendtv] Re: Pros/Cons of DSP processor based MPEG software decoder
or hardware based MPEG decoder
Tom:
While I am not a member of the MPEG-4 AVC working group, the only info I have
is what I read. Please read the following part of an
article:
MPEG-4 Part 10 and VC-1 to Dominate IP Set-Top Boxes, Says ABI Research ABI
Research - January 12, 2005
Advanced video decoders are finding a role as standard features of Internet
Protocol set-top boxes (IP-STBs). According to new
studies from ABI Research, they will be found on virtually all new set-top
boxes by 2008. The analysts estimate that MPEG-4 Part 10
(aka AVC) and VC-1 are included in about 30 percent of currently available
IP-STBs.
MPEG-4 Part 10 (aka AVC) is the ISO standard codec that is the algorithm of
choice for the DVD and digital broadcast industries.
VC-1 is the compression component of Microsoft's Windows Media technology.
Re: D-Cinema, I also am not part of the committee, but in discussion with some
one on the committee, who is also doing events in
theaters, he definitely tells me the industry wants H.264 AVC Level 10.
Ralph
Ralph P. Manfredo
President and CEO
rmanfredo@xxxxxxxx
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