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<div class="moz-cite-prefix">On 11/22/2019 12:36 AM, Kenneth Emerson
wrote:<br>
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<div dir="ltr" class="gmail_attr">On Wed, Nov 20, 2019 at 1:49
PM Jay Foster <<a href="mailto:jayf0ster@roadrunner.com"
moz-do-not-send="true">jayf0ster@roadrunner.com</a>>
wrote:<br>
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<div>On 11/20/2019 9:52 AM, Kenneth Emerson wrote:<br>
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<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>
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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>
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<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>
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<br>
Similar thing happened to me on an earlier version of MythTv,
running on Ubuntu 16.04. I've stayed with OpenGL ever since.<br>
<br>
Don<br>
<br>
Re: HD Hiomerun works better in HDHomeRun viewer than MythTV<br>
<a class="moz-txt-link-freetext" href="https://lists.gt.net/mythtv/users/622959?search_string=HD%20Hiomerun%20works%20better%20in%20HDHomeRun%20viewer%20than%20MythTV;#622959">https://lists.gt.net/mythtv/users/622959?search_string=HD%20Hiomerun%20works%20better%20in%20HDHomeRun%20viewer%20than%20MythTV;#622959</a><br>
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