PBS HD Buffalo Ghosting & Other Issues - Page 2 - Canadian TV, Computing and Home Theatre Forums
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post #16 of 204 (permalink) Old 2006-07-13, 07:33 PM Thread Starter
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Quote:
Originally Posted by Neild
can someone define Jello head?
Have you ever seen the cover of "Paranoid" by Black Sabbath ?

http://images.google.ca/imgres?imgur...lr%3D%26sa%3DN

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Last edited by filper; 2006-07-13 at 07:39 PM.
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post #17 of 204 (permalink) Old 2006-07-14, 12:27 AM
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This is definitely something new. I watched the Cousteau Shark programme and the ghosting was really bad. Every time a shark swam past, there were a half dozen "ghost trails" following the fin.

It was definitely not like this a few months ago when we watched the first Cousteau programmes. If I don't hear back in a day or so, I'll write again.

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post #18 of 204 (permalink) Old 2006-07-14, 08:15 AM Thread Starter
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Quote:
Originally Posted by 57
This is definitely something new. I watched the Cousteau Shark programme and the ghosting was really bad. Every time a shark swam past, there were a half dozen "ghost trails" following the fin.
I watched that too. Stunning photography as displayed by near static images.

It is so unfortunate to ruin it with overcompression.

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post #19 of 204 (permalink) Old 2006-07-14, 12:22 PM
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If it were simply overcompression, we'd should be seeing macroblocking too. I've never seen this ghosting and jello heads before on an HD channel. They may have some problem...

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post #20 of 204 (permalink) Old 2006-07-14, 03:45 PM Thread Starter
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Hmmm, I got this today:



Sorry it took so long to get back to you. We have very recently received a couple of more complaints of this nature - smearing or ghosting with fast motion. This feed comes directly to us from PBS,
and the best we can tell is that they may be having problems with shows that were not originally filmed in HD. They "upconvert" these shows, and it appears that the upconversion process may have
some issues with fast motion. To be honest, we really haven't seen the problem here so we have to assume that it is only on occasional shows.

We haven't changed our subchannel lineup or bandwidth parameters in over a year, and this appears to be a recent problem, so I don't think this is an issue. FYI, we use a system that dynamically
allocates bandwidth to whichever channel(s) need it most at any given time, with the HD channel as a priority, so this shouldn't be a problem for all but the most demanding video.

We'll keep an eye on this and if we can catch it in the act we'll be able to determine if it's coming from the source.

Best regards and thanks for viewing!

Joe Puma
Director of Engineering and Technology
Western New York Public Broadcasting Association

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post #21 of 204 (permalink) Old 2006-07-14, 04:16 PM
 
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Saw the shark show and the ghosting was very noticable. I am in the GTA.
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post #22 of 204 (permalink) Old 2006-07-14, 04:51 PM
 
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I noticed something wrong with WNED's PBS HD feed almost immediately after Rogers switched to it from Spokane in late April '06. I guess WNED never really cared about the HD picture quality, but rather tried to cram a couple SD subchannels into the WNED ATSC broadcast. It's a shame IMO, that Rogers can't get a decent full bandwith PBS HD feed to supply to its subscribers.
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post #23 of 204 (permalink) Old 2006-07-14, 05:15 PM
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Joe (PBS) called me today and we had an excellent discussion for about 20 minutes.. They are monitoring this via 13" professional monitors. No wonder they can't see it.. My 61" TV is over 20 times as large.

He said they'd try to see if they can see the problem. I advised him it's also on true HD stuff like Cousteau, Springsteen, etc, so as far as I'm concerned that blows his upconversion hypothesis. I basically said what I needed to say directly to him.

For Rogers customers, perhaps we need to bug Rogers to give us Spokane back. More bitrate and no logo, make for better PQ..

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post #24 of 204 (permalink) Old 2006-07-14, 06:11 PM Thread Starter
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I sent Joe a link to this thread, so (if he's reading as I would in his position), speak up, or forever hold your piece.

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post #25 of 204 (permalink) Old 2006-07-15, 08:47 AM Thread Starter
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Quote:
Originally Posted by 57
He said they'd try to see if they can see the problem. I advised him it's also on true HD stuff like Cousteau, Springsteen, etc, so as far as I'm concerned that blows his upconversion hypothesis.
Most of our displays upconvert 480i from DVD and I've never seen 'ghosting' on a DVD, so I agree with you.

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post #26 of 204 (permalink) Old 2006-07-16, 03:52 PM Thread Starter
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'Exploring Space' this afternoon had a major lipsync audio delay.

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Last edited by filper; 2006-07-16 at 04:09 PM.
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post #27 of 204 (permalink) Old 2006-07-17, 10:51 AM
 
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Ghosting on PBS

I just wanted to add that I'm in downtown Toronto with Rogers on the 8300 HDPVR and I notice the ghosting on PBS as well ...
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post #28 of 204 (permalink) Old 2006-07-17, 11:15 AM
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I took quite a few pictures of the ghosting on the weekend, on several programmes. The ghosting is a huge issue, which is very clearly present on the pictures I have for HD and WS programming. I sent the photos to PBS today. I'll advise when/if I hear back.

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post #29 of 204 (permalink) Old 2006-07-17, 05:40 PM
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Pictures were sent. Received the following response...

Quote:
We have re-started our HD Encoder, statistical multiplexer and satellite receiver in a first attempt to rectify this problem. We are now attempting to distill any changes that we have made to this
system in the last month or so to try and firgure out what is causing this. Your input is greatly appreciated!

Director of Engineering and Technology
Western New York Public Broadcasting Association

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post #30 of 204 (permalink) Old 2006-07-17, 08:05 PM
 
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PBS problems

Just wanted to say - awesome job 57. Thanks for doing that. Secondly, I love the response time from PBS in the States. If only Rogers was that fast!
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