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<div class="moz-cite-prefix">On 11/20/2019 9:52 AM, Kenneth Emerson
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CADzwnhU02wavd8pvsBC6Kfdt7qpaFaaLHWygnpABVRZSQfGYUQ@mail.gmail.com">
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<div dir="auto"><span
style="color:rgb(51,51,51);font-family:"lucida
grande","trebuchet
ms",verdana,helvetica,arial,sans-serif;font-size:13px;background-color:rgb(225,235,242)">I
have 2 HDHR tuners: a quttro and a dual. All programming is
OTA. All recordings are perfect except for 1 channel (NBC).
Watching recordings from this channel breaks up for 1 second
or less whenever there is a large change in the picture like
when the broadcast throws up an ID banner for the news
program. It's as if the stream is missing a type 'A' frame so
it pixelates until it gets the next A frame.</span><br
style="color:rgb(51,51,51);font-family:"lucida
grande","trebuchet
ms",verdana,helvetica,arial,sans-serif;font-size:13px;background-color:rgb(225,235,242)">
<br style="color:rgb(51,51,51);font-family:"lucida
grande","trebuchet
ms",verdana,helvetica,arial,sans-serif;font-size:13px;background-color:rgb(225,235,242)">
<span style="color:rgb(51,51,51);font-family:"lucida
grande","trebuchet
ms",verdana,helvetica,arial,sans-serif;font-size:13px;background-color:rgb(225,235,242)">So
I have experimented as follows:</span><br
style="color:rgb(51,51,51);font-family:"lucida
grande","trebuchet
ms",verdana,helvetica,arial,sans-serif;font-size:13px;background-color:rgb(225,235,242)">
<span style="color:rgb(51,51,51);font-family:"lucida
grande","trebuchet
ms",verdana,helvetica,arial,sans-serif;font-size:13px;background-color:rgb(225,235,242)">Check
signal with HDHR app: 100% for all three measurements</span><br
style="color:rgb(51,51,51);font-family:"lucida
grande","trebuchet
ms",verdana,helvetica,arial,sans-serif;font-size:13px;background-color:rgb(225,235,242)">
<span style="color:rgb(51,51,51);font-family:"lucida
grande","trebuchet
ms",verdana,helvetica,arial,sans-serif;font-size:13px;background-color:rgb(225,235,242)">use
all the tuners (total of 6) -- all have the problem</span><br
style="color:rgb(51,51,51);font-family:"lucida
grande","trebuchet
ms",verdana,helvetica,arial,sans-serif;font-size:13px;background-color:rgb(225,235,242)">
<span style="color:rgb(51,51,51);font-family:"lucida
grande","trebuchet
ms",verdana,helvetica,arial,sans-serif;font-size:13px;background-color:rgb(225,235,242)">Connect
a different antenna: same problem</span><br
style="color:rgb(51,51,51);font-family:"lucida
grande","trebuchet
ms",verdana,helvetica,arial,sans-serif;font-size:13px;background-color:rgb(225,235,242)">
<span style="color:rgb(51,51,51);font-family:"lucida
grande","trebuchet
ms",verdana,helvetica,arial,sans-serif;font-size:13px;background-color:rgb(225,235,242)">Disable
commercial flagging: same problem</span><br
style="color:rgb(51,51,51);font-family:"lucida
grande","trebuchet
ms",verdana,helvetica,arial,sans-serif;font-size:13px;background-color:rgb(225,235,242)">
<span style="color:rgb(51,51,51);font-family:"lucida
grande","trebuchet
ms",verdana,helvetica,arial,sans-serif;font-size:13px;background-color:rgb(225,235,242)">Connect
antenna to TV (live-no mythtv): perfect picture</span><br
style="color:rgb(51,51,51);font-family:"lucida
grande","trebuchet
ms",verdana,helvetica,arial,sans-serif;font-size:13px;background-color:rgb(225,235,242)">
<span style="color:rgb(51,51,51);font-family:"lucida
grande","trebuchet
ms",verdana,helvetica,arial,sans-serif;font-size:13px;background-color:rgb(225,235,242)">Use
smart TV's software to connect directly to HDHR: perfect
picture</span><br
style="color:rgb(51,51,51);font-family:"lucida
grande","trebuchet
ms",verdana,helvetica,arial,sans-serif;font-size:13px;background-color:rgb(225,235,242)">
<br style="color:rgb(51,51,51);font-family:"lucida
grande","trebuchet
ms",verdana,helvetica,arial,sans-serif;font-size:13px;background-color:rgb(225,235,242)">
<span style="color:rgb(51,51,51);font-family:"lucida
grande","trebuchet
ms",verdana,helvetica,arial,sans-serif;font-size:13px;background-color:rgb(225,235,242)">This
tells me something is happening while reading/writing the
stream by the backend. I'm running v30 on Ubuntu 16.4. None of
the other channels exhibit this behavior. The problem is
definitely in the recording and not the playback.</span><br
style="color:rgb(51,51,51);font-family:"lucida
grande","trebuchet
ms",verdana,helvetica,arial,sans-serif;font-size:13px;background-color:rgb(225,235,242)">
<br style="color:rgb(51,51,51);font-family:"lucida
grande","trebuchet
ms",verdana,helvetica,arial,sans-serif;font-size:13px;background-color:rgb(225,235,242)">
<span style="color:rgb(51,51,51);font-family:"lucida
grande","trebuchet
ms",verdana,helvetica,arial,sans-serif;font-size:13px;background-color:rgb(225,235,242)">The
recordings aren't unwatchable, just (very) annoying. I don't
know what else to try besides reinstalling everything
including upgrading to Ubuntu 18.04. Does anyone have any
ideas less drastic?</span><br
style="color:rgb(51,51,51);font-family:"lucida
grande","trebuchet
ms",verdana,helvetica,arial,sans-serif;font-size:13px;background-color:rgb(225,235,242)">
<br style="color:rgb(51,51,51);font-family:"lucida
grande","trebuchet
ms",verdana,helvetica,arial,sans-serif;font-size:13px;background-color:rgb(225,235,242)">
<span style="color:rgb(51,51,51);font-family:"lucida
grande","trebuchet
ms",verdana,helvetica,arial,sans-serif;font-size:13px;background-color:rgb(225,235,242)">--
Ken Emerson</span></div>
<br>
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<pre class="moz-quote-pre" wrap="">_______________________________________________
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</pre>
</blockquote>
It might not be the recording, but the playback. Many NBC stations
changed their MPEG2 encoding parameters a while back which results
in a data stream that the Nvidia VDPAU driver/hardware does not
handle well. If you are using VDPAU for playback, you might try
switching to OpenGL or software decoding as a test to see if that
makes a difference. You could also try viewing the channel with vlc
from the hdhomerun_gui application.<br>
Jay<br>
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