[mythtv] Ticket #11520: Active EIT scanning will stop working if program not found in PAT

[Terry Fisher]

On 2013-08-20 6:50 PM, John P Poet wrote:
> On Tue, Aug 20, 2013 at 3:46 PM, Torbjörn Jansson 
> <torbjorn.jansson at mbox200.swipnet.se 
> <mailto:torbjorn.jansson at mbox200.swipnet.se>> wrote:
>
>     > Being in the US, I use schedulesdirect, so I don't have any
>     experience
>     > with EIT.  That being said, I have setup a box with a HDHomeRun/ATSC
>     > and EIT enabled.  Any tips on what I could possibly do to
>     reproduce the
>     > problem?
>     >
>     > John
>
>     In my case when i have tested eit, sometimes eit collection is
>     never started
>     (you need to wait a minimum of 5-10 minutes or so until it starts) and
>     sometimes it starts right away.
>
>     I have a backend log with -v eit saved from my dev box with this
>     error if
>     that helps.
>     The log is pretty clean from other stuff since it is a dev box.
>     I haven't restarted the backend yet so it still is stuck since a
>     day or two
>     ago.
>
>     But I guess you also need to reproduce it to see where the problem is.
>
>     Perhaps I can connect gdb to the running instance and make some
>     backtraces?
>     Note that I have a few minor additions in the eit fixup on my dev
>     box since
>     I was working on a new guide fixup.
>     But don't think those should be the cause of this problem.
>
>
> If I understand the problem correctly -- that if tuning fails, it 
> never tries to do an EIT scan again -- then the attached patch should 
> fix the problem.  If anyone is able to test this patch and report 
> success, I will try and get it into 0.27.
>
>
> John
>
I started looking into the problem and yes, the problem occurs when 
tuning fails.  In the case I traced down, TVRec::TuningSignalCheck() 
calls scanner->StopActiveScan() and it never starts again.  It may be 
possible to replicate by simply disconnecting the antenna at some point 
after EIT scanning has started.

I will apply the patch tonight and start testing to see if it works, and 
may try disconnecting the antenna to try to replicate the problem before 
and after the patch.

Terry

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