[mythtv-users] Wierd recording problem on HDHR tuners
Don Brett
dlbrett at zoominternet.net
Fri Nov 22 12:42:09 UTC 2019
On 11/22/2019 12:36 AM, Kenneth Emerson wrote:
>
>
> On Wed, Nov 20, 2019 at 1:49 PM Jay Foster <jayf0ster at roadrunner.com
> <mailto: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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Similar thing happened to me on an earlier version of MythTv, running on
Ubuntu 16.04. I've stayed with OpenGL ever since.
Don
Re: HD Hiomerun works better in HDHomeRun viewer than MythTV
https://lists.gt.net/mythtv/users/622959?search_string=HD%20Hiomerun%20works%20better%20in%20HDHomeRun%20viewer%20than%20MythTV;#622959
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