[mythtv-users] Debugging hdhomerun - can I record the same show from multiple tuners in duplicate?

[Ram Ramesh]

On 2/26/23 18:32, Douglas Peale wrote:
> On 2/26/23 16:20, Ram Ramesh wrote:
>> Hi,
>>
>>  I have two HDHomeRun tuner boxes (a dual and another quattro) and I 
>> suspect one of them is broken. I strongly feel it is the quatrro, but 
>> for now, I am going to assume that anyone of them could be broken 
>> because the only evidence I have is that some shows turn out to be 0B 
>> recordings. I have already power cycled and tested with hdhomerun 
>> control/config app on win10. They seem to work fine when watching 
>> live TV in myth also. However one of the boxes very often produces 0 
>> bytes recording.  I would like to record the same show on of both my 
>> tuner boxes at the same time to check if this is a transmission issue 
>> or tuner issue. My antenna is brand new and I doubt it is at fault.
>>
>>   Both units are several years old, so it could be that their adapter 
>> is broken. If so, my app on windows should create problem or 
>> attempting to watch live TV should produce errors, but I do not get 
>> any of those. So, I have not tried fixing adapters
>>
>>   Also, when I added my second HDhomerun unit (quattro) when I bought 
>> it, strangely enough, I got 8 tuners instead of 4. So, I am not sure 
>> if something is wrong with backend setup of this tuner.
>>
>>   I run standard debian 11.6 with default kernel adding mythtv 
>> 0.32-fixes using debian-multimedia repository. I have a gt1030 nvdia 
>> card, but that is unlikely to be relevant as this is a recording issue.
>>
>>   Recording that produces 0B is coming on digital channel 18 
>> (Dallas/KTXA-DT 21.1)
>>
>> Regards
>> Ramesh
>>
>>
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>
> Having double the number of physical tuners is normal. MythTV allows 
> simultaneous recording of multiple sub-channels of a single channel 
> using a single tuner. It implements this feature with virtual tuners.
Thanks. That makes sense.
>
> Check to make sure that the channel MythTV is recording on is the one 
> you think it is recording on, and not some other channel that has the 
> same show in its schedule.
What do you mean? The recorded time matches. As per my quick check, I do 
not see the same show at the same time in any other channel. However, I 
like to check from the database. How do I check this to be absolutely sure?
>
> Is one of your tuners one of the original HDHomeRun tuners with the 
> two inputs? If so, you need a splitter to feed both inputs the same 
> signal. At one time, you could have a different signal on each input 
> and set them up independently, but MythTV discontinued this feature, 
> and it assumes all tuners in a box have the same signal.
Yes, it is the original and it is connected to two different outputs of 
the same signal amplifier that is connected to antenna.

Most of the recordings are from this 2-tuner box and they are fine. So, 
I doubt it is this box. I could potentially switch all shows to my 
second hdhomerun, but reluctant to do this as I might loose entire day's 
recording to 0B issue.

Regards
Ramesh
>
>
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