[mythtv-users] HD Hiomerun works better in HDHomeRun viewer than MythTV

[John Pilkington]

On 01/01/2019 23:52, James Linder wrote:
> 
> 
>> On 1 Jan 2019, at 8:00 pm, mythtv-users-request at mythtv.org wrote:
>>
>>>>>>>
>>>>>>> On 12/30/2018 2:40 PM, Don Brett wrote:
>>>>>>>> I have a roof mounted antenna and my house is within 3-5 miles of all
>>>>>>>> the local channels.? Signal strengths are very good. Shows are always
>>>>>>>> pixelated in MythTV, some worse than others, but it happens on pretty
>>>>>>>> much every show.?? On a whim, I tried the HDHomeRun viewer, which is
>>>>>>>> supplied by Silicon Dust, everything looks perfect.? Is there a
>>>>>>>> mythtv
>>>>>>>> update or setting I should be looking at?? Any suggestions on how to
>>>>>>>> diagnose?
>>>>>>>>
>>>>>>>> Don
>>>>>> Is it a recording problem or a playback problem?? Find one of the
>>>>>> recordings that gives pixellation in MythTV and use the I key to show
>>>>>> the "Recorded File", then find that file in your storage groups.? Then
>>>>>> use other player software to play the file (eg VLC, mplayer). If
>>>>>> possible, use the HDHomerun software to play the file.? Is it
>>>>>> pixellated when played by other software?
>>>>>>
>>>>>> What version of MythTV are you running?? What is your video hardware?
>>>>>> What drivers are you using?? What settings are you using for playback
>>>>>> in mythfrontend?? What sort of recordings are you making - are they
>>>>>> MPEG2 video, H.264, ...?? Are these DVB-T, ATSC, or something else?
>>>>>>
>>>>>> When the pixellation happens, do you also get audio blips around the
>>>>>> same time?? Is the pixellation just occasional, or frequent? Is it
>>>>>> regular (eg every 15 seconds)?? Does it vary in how long it lasts for
>>>>>> before normal picture is restored?
>>
>>>>>>
>>>>> HDHomeRun doesn't allow playback unless I buy their DVR license, so I
>>>>> can't try it that way.
>>>>
>>>> The HDHR view that you download from their site will work for OTA
>>>> channels without cost. You only pay if you sign up for their DVR or
>>>> Premium service
>>>>
>>> Yes, that's where I started, using the? HDHR viewer to see live OTA
>>> channels.? It looks great in their viewer, but not in MythTv.? As a
>>> test, I was trying to playback a MythTV recorded show (from file) in the
>>> HDHR viewer, but can't without the license.
>>>
>>
>> It's my understanding that myth records and plays back the datastream
>> from the tuner without attempting to correct anything out-of-spec.  VLC
>> playback is probably the same.  Your story suggests that the HDHR player
>> might be massaging a corrupt stream before display.  If your recordings
>> are in mpeg2 format, mythtranscode (for example) might be worth a try.
> 
> This sounds very remisicent of a problem I had
> 
> scan choose different transmitter sites each scan. Some fiddling (rescan) and delete the not-good channels
> The trouble with saying “this black box” is better than “that one” is you don’t know what is being compared.
> 
> Bing! all pixellation gone
> 
> James

Yes: it's probably more likely that you are just comparing signals from 
different sources.

John