[mythtv-users] Wierd recording problem on HDHR tuners

[Kenneth Emerson]

On Wed, Nov 20, 2019 at 1:49 PM Jay Foster <jayf0ster at roadrunner.com> wrote:

> On 11/20/2019 9:52 AM, Kenneth Emerson wrote:
>
> 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.
>
> So I have experimented as follows:
> Check signal with HDHR app: 100% for all three measurements
> use all the tuners (total of 6) -- all have the problem
> Connect a different antenna: same problem
> Disable commercial flagging: same problem
> Connect antenna to TV (live-no mythtv): perfect picture
> Use smart TV's software to connect directly to HDHR: perfect picture
>
> 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.
>
> 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?
>
> -- Ken Emerson
>
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>
> 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.
> Jay
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Jay, David & Jim:

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.

BTW: Is there a reason why I shouldn't just continue with the OpenGL
playback profile?

Regards.

Ken Emerson
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