[opendtv] Re: "Live" DTV from Mars now possible !
- From: "John Willkie" <johnwillkie@xxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Tue, 10 Aug 2004 17:21:06 -0700
Windows media (which could be used as media transport for this) can do HD in
6mb/sec. I don't think there's going to be much image deltas frame to frame
in the content, certainly nothing like basketball.
John Willkie
-----Original Message-----
From: opendtv-bounce@xxxxxxxxxxxxx
[mailto:opendtv-bounce@xxxxxxxxxxxxx]On Behalf Of Olivier HOUOT
Sent: Tuesday, August 10, 2004 1:26 PM
To: opendtv@xxxxxxxxxxxxx
Subject: [opendtv] "Live" DTV from Mars now possible !
I just happened to stumble on the telecom specs of the future NASA mars
reconnaissance orbiter:
http://mars.jpl.nasa.gov/mro/mission/sc_telecomm.html
It is scheduled for launch in less than a year, and allows for 6 Mbps
over a distance of 100 million kilometers.
Now with good quality SDTV feeds ranging from 4 to 6 Mbps, and possibly
less with state of the art MPEG2 encoders, this would indeed make real
time video transmission possible from the red planet, with a
transmission delay that would be as small as 5 mn with the said distance
(true, those would be the most favourable conditions, when Mars and
Earth are practically face-to-face, worst case would be three times that
amount, probably with a much lower bitrate).
Of course, there is not much action in orbit, but it could be used to
relay transmissions from rovers or an exploration plane (another of
NASA's projects) and, of course , the first steps of man on Mars.
That may be a little tight for HDTV, though, unless 720P artfully
compressed using H.264 ...?
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