[mythtv-users] Video card update fail

[Allen Edwards]

On Sat, Oct 13, 2018 at 7:35 AM Allen Edwards <allen.p.edwards at gmail.com>
wrote:

>
>
> On Sat, Oct 13, 2018 at 2:31 AM Stephen Worthington <
> stephen_agent at jsw.gen.nz> wrote:
>
>> On Fri, 12 Oct 2018 09:12:27 -0700, you wrote:
>>
>>
>> >After my wife was done watching, I ran this command "mythbackend
>> >--setverbose record" and started looking at the log while recording some
>> >random show.
>> >
>> >What I see is a lot of messages like this
>> >Oct 12 09:09:19 NewMyth mythbackend: mythbackend[867]: W
>> HDHRStreamHandler
>> >recorders/dtvrecorder.cpp:1573 (ProcessAVTSPacket) DTVRec[1]: A/V PID
>> 0x51
>> >discontinuity detected ((6+1)%16!=14)  0.00%
>> >
>> >None of the score = 0 type and I have not watched the show to see if
>> there
>> >are issues. Are the messages that say "discontinuity detected"
>> significant?
>>
>> Unfortunately, those discontinuity messages do not seem to be
>> necessarily significant.  I do get them when the recording is OK - I
>> think they can happen when ad breaks get inserted and the video stream
>> is disrupted by that.  But I only seem to get them from my DVB-S
>> tuners via minisatip, so I have not ruled out a bug in minisatip from
>> being the cause.  If there are lots of them, that is likely to
>> indicate a problem, but an occasional burst of just one or two at a
>> time (like I get) does not seem to indicate a real problem.  As best I
>> can determine, the ones I get when the recording does have a problem
>> will have a final calculated % value that is non-zero.  The ones that
>> I get that do not correspond to a bad recording all seem to have a
>> final calculated value of 0.0 % or a very small number (< 0.00001 %).
>> _______________________________________________
>>
>
> I see lots of the the discontinuity detected messages but looking at the
> time stamps, they are in groups of one or two.
> Taking yesterday as a test day, I saw glitches in programs on both
> HDHomerun units, on different channels, one UHF and one VHF, and I saw
> no overall_score="0". That said, I erased the show from the second
> HDHomerun so I can't prove it actually recorded on that unit so I need to
> repeat that.
>
> I will not rule out a signal strength problem but I would be very
> surprised if the VHF channel had a problem.  The UHF channel is typically
> more difficult to get.  I would also not expect interference to hit both
> channels.
>
> The only thing I can think to do now, other than repeating the HDHomerun
> experiment, is to watch a show live on the TV and then watch the recorded
> version.  Anyone have other ideas?
>
> Allen
>

I should have added that the "discontinuity detected" messages are coming
at an average rate of 11 per minute.  Might be scene changes in the source
as this is a news show and they change scenes at about that rate.

Allen
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