[opendtv] Re: Non ATSC Table A3 bitstream
- From: "Tom McMahon" <TLM@xxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Wed, 12 Jan 2005 07:19:11 -0800
Table Three is a subset of the MPEG-2 Standard. ATSC should have made ATSC
received fully conformant with the MPEG-2 Standard.
They also should have put a provision in their system architecture for
1080/60P. The ATSC subcommittee T3/S6 was supposed to do
that, but they didn't. Now they're too busy fooling around with mobile tools
that nobody will ever use. This has nothing to do
with mis-spent use as most of the people involved are well over 50 (if no 60).
-----Original Message-----
From: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx] On
Behalf Of Ron Economos
Sent: Wednesday, January 12, 2005 5:38 AM
To: opendtv@xxxxxxxxxxxxx
Subject: [opendtv] Non ATSC Table A3 bitstream
I received an interesting ATSC Transport Stream from a viewer of WCPO-DT in
Cincinnati. The primary reason he sent it to me was that
the 720p image quality had "staircase" artifacts. Somehow the ABC network feed
image is losing half it's vertical resolution at some
point in WCPO-DT's signal chain. See:
http://www.avsforum.com/avs-vb/attachment.php?s=&postid=4964887&fullpage=1
http://www.avsforum.com/avs-vb/attachment.php?s=&postid=4970734&fullpage=1
However, the more interesting aspect of the stream was the second sub-channel
video was coded at 528x480. This is the first ATSC
video bitstream I've seen with a non Table A3 resolution. In addition, the
video bitstream did not have any I-frames, but instead
was using progressive intra block refresh. I wonder if WCPO pressed some cable
head-end encoder into service (since 528x480 and
progressive intra refresh are very much cable).
http://www.avsforum.com/avs-vb/attachment.php?s=&postid=4971625&fullpage=1
Of course, another viewer has already complained that this bitstream does not
decode properly on his receiver (small vertical
flashing bars on the right side of the image).
Ron
Tom McMahon wrote:
>But then that bankrupt Table 3 would get in the way. What a mess.
>
>
>
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