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

Terry Fisher lists at tfisher.ca
Wed Aug 21 01:49:10 UTC 2013

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.


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