[mythtv-users] duplicate callsigns? (was: Re: utterley confused)

Vincent McIntyre vincent.mcintyre at gmail.com
Mon Jun 23 13:15:13 UTC 2014


On 6/23/14, James Linder <jam at tigger.ws> wrote:
>
> Here is a sequence that shows this bizare behaviour:
>
> 16:59
> 1 program scheduled to record
> http://tigger.ws/myth1.png
>
> 17:01
> It has started to record
> http://tigger.ws/myth2.png
>
> 17:03
> The second instance has started. It reports start time as 16:58 but really
> it is 17:02 ish
> http://tigger.ws/myth3.png
>
> I can’t make sense of this. It is a new DB. Anybody help please …
>

This may be sending you down the wrong track here so I've tweaked the
subject line...
I have noticed that some Australian broadcasters send out more than
one program stream in their multiplex that has the exact same
callsign. I am not sure how mythtv copes with this.

If you want to check whether this is happening in your case, here is
what I would try.
Stop the mythtv-backend, and do a scan with 'w_scan -f t -c AU -X -a 0'.
it will spit out a bunch of detailed channel information. The reason
for using w_scan
is that I find it simpler to see the raw detail of what is being
transmitted than the myth channel editor.

Here is what I get for the channel 10 multiplex in Sydney (on 219500000 Hz)
(I took out a few spaces in the first field to keep the long lines together).

ONE(TENSydney):219500000:INVERSION_AUTO:BANDWIDTH_7_MHZ:FEC_3_4:FEC_NONE:QAM_64:TRANSMISSION_MODE_8K:GUARD_INTERVAL_1_16:HIERARCHY_NONE:514:672:1569
TENDigital(TENSydney):219500000:INVERSION_AUTO:BANDWIDTH_7_MHZ:FEC_3_4:FEC_NONE:QAM_64:TRANSMISSION_MODE_8K:GUARD_INTERVAL_1_16:HIERARCHY_NONE:512:650:1573
TVSN(TENSydney):219500000:INVERSION_AUTO:BANDWIDTH_7_MHZ:FEC_3_4:FEC_NONE:QAM_64:TRANSMISSION_MODE_8K:GUARD_INTERVAL_1_16:HIERARCHY_NONE:518:690:1574
ONE(TENSydney):219500000:INVERSION_AUTO:BANDWIDTH_7_MHZ:FEC_3_4:FEC_NONE:QAM_64:TRANSMISSION_MODE_8K:GUARD_INTERVAL_1_16:HIERARCHY_NONE:514:672:1575
ELEVEN(TENSydney):219500000:INVERSION_AUTO:BANDWIDTH_7_MHZ:FEC_3_4:FEC_NONE:QAM_64:TRANSMISSION_MODE_8K:GUARD_INTERVAL_1_16:HIERARCHY_NONE:516:681:1576
SpreeTV(TENSydney):219500000:INVERSION_AUTO:BANDWIDTH_7_MHZ:FEC_3_4:FEC_NONE:QAM_64:TRANSMISSION_MODE_8K:GUARD_INTERVAL_1_16:HIERARCHY_NONE:520:700:1577

It's not obvious to me (without additional information from other
sources) whether the duplicate callsign indicates exactly the same
content in the program stream - the programid field (the last one I
think, w_scan's output needs better documentation) is different.

Hope this helps a bit
Vince


More information about the mythtv-users mailing list