[mythtv-users] LiveTV issues (root caused to cable signals)
Monkey Pet
monkeypet at gmail.com
Sat Sep 1 23:02:09 UTC 2012
On Sat, Sep 1, 2012 at 8:40 AM, Monkey Pet <monkeypet at gmail.com> wrote:
>
>
> 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.
>
Now everything is running 0.26-head, as expected I see the same issues. I
found a better/shorter coax cable and used that instead and my signals are
getting better.
This low signal issue might be a good test case for the developers. It
leads to strange mythfrontend behaviors for example, you can easily crash
the frontend by:
1. starting liveTV
2. then pulling the coax on your HDhomerun box.
3. mythfrontend will either crash OR display the max buffering error
I'll file a bug issue for this case.
>
>
>>
>> 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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>>
>
>
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