[mythtv-users] Wierd recording problem on HDHR tuners

[Jay Foster]

On 11/22/19 4:42 AM, Don Brett wrote:
> 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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>>>     http://wiki.mythtv.org/Mailing_List_etiquette
>>>     MythTV Forums:https://forum.mythtv.org
>>     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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> MythTV Forums: https://forum.mythtv.org

I tried software decoding, which fixed the playback issue with the NBC 
station, but it made the comm flag editing (for removing commercials via 
lossless transcoding) so sluggish that it was unusable.  I went back to 
VDPAU.


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