<div dir="auto"><div><br><div class="gmail_extra"><br><div class="gmail_quote">On Oct 23, 2017 11:49 AM, "Jay Foster" <<a href="mailto:jayf0ster@roadrunner.com">jayf0ster@roadrunner.com</a>> wrote:<br type="attribution"><blockquote class="quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<div class="m_3040738176418298256moz-cite-prefix">On 10/22/2017 1:04 PM, Ian Evans wrote:<br>
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<div dir="ltr">Greetings MythTVizens, before I delve into the
technical issue, if you're in the Buffalo/Toronto area and
record OTA you might be able to duplicate this issue by
recording Colbert or CBS This Morning.<br>
<br>
After adding their first subchannel (which was already on
another channel in the same city), I reached out to a WIVB
station engineer to confirm what was happening. He said there
was a subchannel ballet going on between the two stations, but
yes, they had added the subchannel after getting a new encoder
last week. That's around the same time I began noticing the
problems. They are related to this 2016 thread: "Concert footage
and video artifacts" (<a href="http://lists.mythtv.org/pipermail/mythtv-users/2016-November/389597.html" target="_blank">http://lists.mythtv.org/<wbr>pipermail/mythtv-users/2016-<wbr>November/389597.html</a>)
in which I described blocky video during fast transitions and
got an education in compression artifacts and bandwidth.<br>
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<div>That issue was mostly scene in fast music award transitions
with smashing cymbals and flashing stage lights, where the
image would suddenly look like an 8 bit game. But this issue
is more subtle but still annoying and noticeable and it's
happening in moments it never happened before. Again, if
you're in the Buffalo/Toronto area try watching the opening
title sequence of Late Night with Stephen Colbert or the
"Morning Eye" opening segment of CBS This Morning. As the
video go from scene to scene, multiple black blocks appear in
random part of the image. I watch both shows regularly and
this has just been happening since the station switched to the
new encoder.</div>
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<div>WIVB has only one subchannel and they're not trimming the
bandwidth too much as a 2 hr show has gone from about 14gigs
to 12. Other channels in the area have far more subchannels
and I'm not seeing the black blocks on their programming. The
station engineer says he's not seeing it with their
off-the-air recordings but he'll keep looking. Is there
anything I can tweak on my end? Given that channels with more
subs don't have this issue could it be some setting/tweak on
their new encoder? I know this is hard to diagnose but I'd
appreciate any tips.</div>
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Over the years, I have seen anomalies and glitches on OTA
broadcasts. What I found effective in getting them resolved is to
make a short clip (a few seconds) of the problem and email it to the
station engineer. When they can see what you are seeing, they are
more likely able to resolve it. Even some still frames showing the
issue can help.<br></div></blockquote></div></div></div><div dir="auto"><br></div><div dir="auto">Good reminder, I've done that in the past. </div><div dir="auto"><div class="gmail_extra"><div class="gmail_quote"><blockquote class="quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div text="#000000" bgcolor="#FFFFFF"></div></blockquote></div></div></div></div>