[mythtv-users] pixalated live tv images

[Kevin Johnson]

On Sun, Oct 30, 2016 at 9:03 PM, Kevin Johnson <iitywygms at gmail.com> wrote:

>
>
> On Sun, Oct 30, 2016 at 5:06 PM, Kevin Johnson <iitywygms at gmail.com>
> wrote:
>
>> On Sat, Oct 29, 2016 at 8:13 PM, Peter Bennett <cats22 at comcast.net>
>> wrote:
>>
>> >
>>
>> > On 10/29/2016 07:51 PM, Kevin Johnson wrote:
>>
>> >>
>>
>> >>
>> >>
>> >> On Fri, Oct 28, 2016 at 8:21 PM, Peter Bennett <cats22 at comcast.net>
>> wrote:
>>
>> >>>
>>
>> >>> On 10/28/2016 06:03 PM, Kevin Johnson wrote:
>> >>> > Hdhr is connected to a router that goes to the same card.
>> >>> >
>> >>> I had a problem with an HDHR and a DLINK router. When the HDHR and
>> >>> backend were connected to the router, packets were lost every few
>> >>> seconds, causing pixellation. I fixed it by using a switch between
>> HDHR
>> >>> and backend, and just using the router for the Internet connection. It
>> >>> seems that the router was dropping packets.
>> >>>
>> >>
>> >> Ya I am beginning to suspect some sort of hardware issue now.  It
>> happens on all frontends and disabling power savings is not solving it.
>> >> Just strange that this all started right after I upgraded everything.
>> >>
>> >> Another thing that has reared its head is starting live tv.  Sometimes
>> it continuously stutters.  I have to pause it a few seconds and then all is
>> fine.
>> >> Usually occurs when I switch from one live channel to another,  And
>> not everytime.
>> >> Still digging around seeing if I can find others with these issues.
>> >>
>> >> Oh the joys of upgrading,
>> >>
>> >>
>> >
>> >
>> > These are notes for how I checked this situation. If you see "n" in
>> among the dots then you have packet loss (as in the example below).
>> >
>> > Check for packet loss
>> > Low level test for network packet loss - PRIME:
>> >
>> > From a shell (on backend when nothing is recording) run:
>> > hdhomerun_config FFFFFFFF set /tuner2/vchannel <channel number>
>> > hdhomerun_config FFFFFFFF save /tuner2 null
>> > Replace "<channel number>" with the channel number for an unprotected
>> channel in your area.
>> > If you have more than one HDHomeRun unit then replace "FFFFFFFF" with
>> the device ID of the desired unit.
>> > You should see a series of dots. "n" indicates network packet loss. "t"
>> indicates a reception error. "s" is informational.
>> > eg
>> > ............................................................
>> ....................
>> > ...................................n........................
>> ....................
>> > ............................................................
>> ...............n....
>> > ............................................................
>> ....................
>> > ...................................n........................
>> ....................
>> > ............................................................
>> ...............n....
>> > ............................................................
>> ....................
>> > ...................................n........................
>> ....................
>> > ............................................................
>> ...............n....
>> > ............................................................
>> ....................
>> > ...................................n........................
>> ....................
>> > ...........................................................................n...
>>
>> >
>> Thanks for the info.  I ran the above and everything looks great.
>> Video statistics --
>> 81451 packets received, 0 overflow errors, 0 network errors, 0 transport
>> errors, 0 sequence errors
>>
>>  I also tried a different drive and storage group for live. TV.  No joy.
>>
>> If anything. It seems like live TV starts to fast.  Much faster than ,27
>> did imo.
>> If I exit. And start again it is fine
>>
>>
>>
> Okay.  This only happens when the live picture resolution is 720p.  Does
> not occur on 1080i images.
> Driver issue maybe?   Guess I can roll back the nvidia driver.
>
> Im going to use vappi for a while to see if that makes it go away.
>


Okay. I will try to explain what is going on. I now know this is not a
hardware issue.
Last night I was watching a program on live tv that really exhibited the
problem. Watching the screen I noticed a pattern to the pixilation. The
distortion kind of appeared as letter or numbers. So I paused the screen
and noticed that the area of distortion exactly matches the pattern of the
“theme layout”

(The distortion was occurring where the name of my turner is displayed at
the top of the screen)
I currently use the mythbuntu theme. So I switched themes. The live tv
distortion area changed with the theme being used.

So I guess what is happening is that the underlying “theme layout” is
bleeding through to the live tv image.
I dont know how to exactly explain this. Hopefully what I am saying will
make sense to someone???
One other note. Using the normal option under playback instead of vdpau
also makes the distortion disappear.
Can I gather more information somehow that might further help figure out
what is going on?

Should I post over on the forums so I can upload some pictures?



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>
>
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