Thank you all for your responses to my
video question.
I’ve asked about uncompressed video
because in applications like 1 and 2 mentioned by Michael below, video
compression adds cost and latency and degrades quality.
At >1Gbit, uncompressed HD video
appears to be too bandwidth intensive for today’s residential networks. Is
this a fair assessment?
For scenarios where content is streamed in
compressed format (i.e. digital cable, terrestrial or satellite; DVD or media-server
playback), what would be RE’s technical contribution?
Thanks Michael for the DV alphanumeric
soup. The DV options are interesting but it sounds like the DV format is losing
ground to MPEG.
From:
owner-stds-802-3-re@ieee.org [mailto:owner-stds-802-3-re@ieee.org] On Behalf Of Michael Johas Teener
Sent: Friday, July 01, 2005 11:28
AM
To:
STDS-802-3-RE@listserv.ieee.org
Subject: Re: [RE] Video question
Ah, yes ... and the requirements
for DV are:
DV-SD – 25 Mbit/sec (This is a kind of motion JPEG with 4:1:1 encoding
... non-pro chroma)
DV-HDV – 25 Mbit/sec (this is consumer HD with MPEG-2)
DV50 – 50 Mbit/sec (motion JPEG with 4:2:2 encoding ... better chroma)
DV100 – 100 Mbit/sec (HD motion JPEG with 4:2:2 encoding ... no
interframe compression so easy editing)
On 7/1/05 9:36 AM, "Jim Battaglia" <jbattaglia@pioneer-pra.com>
wrote:
Mike,
I was also add conventional (digital) consumer camcoders to your list. It is my
understanding that most of these still use DV, which is no where near as
compressed as MPEG-2. I realize that many camcorder manufacturers are
moving to MPEG compressed format, but there are still a a lot of DV cameras out
there.
It's not inconceivable that you may want to move this content on a home network
without further compression.
Jim
Michael Johas Teener wrote:
Not speaking for Kevin, but based on earlier conversations with CE vendors,
MSOs, and content providers, uncompressed video is useful for:
1) Games (from console to display) ... currently only SD quality (that's
about 270 Mbit/sec in the US, as you noted) ... GigE can carry ... but the
next generation consoles support HD at 1080i or roughly 1.5Gbit/sec ...
2) Overlaying the UI from a STB or other residential gateway ... currently
requires uncompressed video because low cost STBs do not include MPEG2
*encoders* ...
3) Security/monitoring cameras ... although the fidelity requirements are
rather low, so cheap compressors are becoming available that meet this need
...
On 6/30/05 9:36 PM, "Geoffrey M. Garner" <gmgarner@comcast.net>
<mailto:gmgarner@comcast.net>
wrote:
In the discussions so far, the digital video has been assumed to either
enter the residence from a service provider or originate in the residence at
a DVD player. It seems that both cases, at least at present, use
compressed
digital video. Are there applications that involve uncompressed digital
video (or are there expected to be such applications)?
--
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Michael D. Johas Teener
— mikejt@broadcom.com
office +1-408-922-7542 cell +1-831-247-9666 fax +1-831-480-5845
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