[mythtv-users] LiveTV issues (root caused to cable signals)

Monkey Pet monkeypet at gmail.com
Sat Sep 1 15:40:00 UTC 2012

On Sat, Sep 1, 2012 at 6:01 AM, Michael T. Dean <mtdean at thirdcontact.com>wrote:

> On 09/01/2012 01:51 AM, Joseph Fry wrote:
>>>  After re-cabling:
>>>>> (notice the numbers jump)
>>>>> [me at mythtv libhdhomerun]$ ./hdhomerun_config 1313E021 get
>>>>> /tuner0/status
>>>>> ch=qam:759000000 lock=qam256 ss=76 snq=82 seq=100 bps=38809216 pps=994
>>>> Those numbers, while clearly better, are still rather low.  I typically
>>>> see values in the 90's.  I seem to recall ss=76 indicates a power
>>>> level that would normally be out of spec for digital cable (although
>>>> it might just work sometimes).
>>>> First thing, plug the hdhr directly into the outlet using a short piece
>>>> of
>>>> quality coax, and see if the values are more reasonable.  If not, call
>>>> your cable company and ask them to make a service call.  They are
>>>> responsible for adequate signal levels at the outlet.  If it looks good
>>>> directly plugged into the outlet, it would point the finger towards your
>>>> coax or splitters (or cable amp if you using one).
>>>>  I just don't understand why recording a show works, but LiveTV always
>>> fail.  That seems odd to me.
>>>  That is odd.  Do you have fast channel switching enabled?
It is set to never.

I might have spoken too soon about the issue not occurring on recordings.
 Myth lies about the recording times of truncated recordings, so it is hard
to tell.  I have seen at least one instance of it during a recording.

Until i get my signal issues look at by the comcast guys, my mythbox is
useless now, I plan to upgrade to 0.26 to see if the behavior changes.

> Use quick tuning
>  - Never
>  - Live TV only
>  - Always
> If enabled, MythTV will tune using only the MPEG program number. The
> program numbers change more often than DVB or ATSC tuning parameters, so
> this is slightly less reliable. This will also inhibit EIT gathering during
> Live TV and recording.
> in your Input Connections in mythtv-setup, IIRC.
> Mike
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