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

Peter Bennett pb.mythtv at gmail.com
Thu Jan 24 23:58:53 UTC 2019



On 1/24/19 6:52 PM, Jay Foster wrote:
> On 1/24/2019 3:46 PM, Don Brett wrote:
>> On 1/3/2019 1:42 PM, Gary Buhrmaster wrote:
>>> On Thu, Jan 3, 2019 at 2:39 PM Don Brett <dlbrett at zoominternet.net> 
>>> wrote:
>>>
>>>> Thanks Gary; network questions and dropped packets seem to be the
>>>> consensus so far.  I tried the network test from the Silicon Dust
>>>> thread; it worked perfectly, with zero errors.  I assume
>>>> hdhomerun_config is using TCP.
>>> Nope, hdhomerun_config uses UDP, just like MythTV.
>>>
>>> But it is *critcal* to run the test on the same system
>>> as the MythTV BE.  There are many issues with some
>>> system(s) and their hardware and/or drivers and/or
>>> configuration of the IP stack that can be a contributing
>>> factor.
>>>
>> Not sure why this test didn't work before, but it does now.  I 
>> verified the pixelation was happening in myth, then ran the test on 
>> that same RF channel, directly on the be/fe box, for 104 minutes. 
>> Results are:
>>
>> don at nick:~$ hdhomerun_config FFFFFFFF set /tuner0/channel auto:36
>> don at nick:~$ hdhomerun_config FFFFFFFF save /tuner0 null
>> .........several row of dots..........
>>
>> -- Video statistics --
>> 11,480,828 packets received, 0 overflow errors, 0 network errors, 0 
>> transport errors, 0 sequence errors.
>>
>> It looks like the test received over 11 million packets, with no 
>> errors.  I'm not sure what this means....same hardware, same OS, same 
>> TCP stack...what's next?
>>
>> PS - Transmitter info is below; I've noticed that TV channel 21 is 
>> less bad than 27 and 33.  I located my attenuator.  I'll install it 
>> and see what happens.
>>
>> The local channels are 21, 27, and 33
>> Distance    Heading    RF channel    TV channel
>> 4 mi            351 deg        auto:20        21.1
>> 4 mi            351 deg        auto:20        21.2
>> 2 mi            353 deg        auto:36        27.1
>> 2 mi            353 deg        auto:36        27.2
>> 2 mi            353 deg        auto:36        33.1
>> 2 mi            353 deg        auto:36        33.2
>>
>>
>>
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> Are you using software decode or hardware decode (VDPAU, VAAPI) in 
> MythTV?  Note the decode option can be configured differently from the 
> rendering option (also software or hardware (VDPAU, VAAPI)).
>
There is a bug with VDPAU rendering. Certain channels in the USA are 
using MPEG2 in a way that overloads VDPAU and causes pixellation every 
few seconds. This is nothing to do with HDHomerun, it happens with any 
type of equipment. The solution is to change to software decode and 
OpenGL Rendering for mpeg2 streams. If you are not using VDPAU ignore 
this email.
Peter


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