<div dir="ltr"><div dir="ltr"><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Nov 20, 2019 at 1:49 PM Jay Foster <<a href="mailto:jayf0ster@roadrunner.com">jayf0ster@roadrunner.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div bgcolor="#FFFFFF">
<div>On 11/20/2019 9:52 AM, Kenneth Emerson
wrote:<br>
</div>
<blockquote type="cite">
<div dir="auto"><span>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>
<br>
<span>So
I have experimented as follows:</span><br>
<span>Check
signal with HDHR app: 100% for all three measurements</span><br>
<span>use
all the tuners (total of 6) -- all have the problem</span><br>
<span>Connect
a different antenna: same problem</span><br>
<span>Disable
commercial flagging: same problem</span><br>
<span>Connect
antenna to TV (live-no mythtv): perfect picture</span><br>
<span>Use
smart TV's software to connect directly to HDHR: perfect
picture</span><br>
<br>
<span>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>
<br>
<span>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>
<br>
<span>--
Ken Emerson</span></div>
<br>
<fieldset></fieldset>
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</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>
</div>
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MythTV Forums: <a href="https://forum.mythtv.org" rel="noreferrer" target="_blank">https://forum.mythtv.org</a></blockquote><div><br></div><div>Jay, David & Jim:</div><div><br></div><div>I want to thank you so much for your input. You were spot on with the playback issue. I switched from VDPAU High Quality to OpenGL High quality and the problem vanished. Everyone (including the wife) is happy again. I've been a fan of MythTV since February of 2006 and even with the advent of streaming, my wife and I find the majority of what we watch is OTA on Myth. It's been a long time since I had to ask for help; very glad it's still available. If y'all in the States, have a great Thanksgiving.</div><div><br></div><div>BTW: Is there a reason why I shouldn't just continue with the OpenGL playback profile?</div><div><br></div><div>Regards.</div><div><br></div><div>Ken Emerson </div></div></div>