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

[Michael Watson]

On 24/06/2014 4:35 PM, Karl Dietz wrote:
> On 23.06.2014 15:15, Vincent McIntyre wrote:
>> Stop the mythtv-backend, and do a scan with 'w_scan -f t -c AU -X -a 0'.
>
> Ok, so we are looking at a t_zap style channels.conf output, see
> http://www.linuxtv.org/wiki/index.php/Dvbscan#After_the_scan_completes
>
>> 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.
>
> Well spotted, the program_number / service_id of both "ONE" services 
> is different, while the rest is identical.
>
> So the service name ONE appears twice both have the video PID 514 and 
> the audio PID 672. At this point in time both channels carry exactly 
> the same content, because its two services referring to the same 
> audio/video streams. But both services have different service ids, 
> 1569 and 1575, these can at any point in time be changed to point to 
> separate audio/video streams, e.g. to split the channel into two for 
> regional news/ads. A technique called dynamic PMT.
>
> The description over at Wikipedia does not allow me to understand 
> which regional variants exist.
> http://en.wikipedia.org/wiki/One_%28Australian_TV_channel%29#Availability
>
> In MythTV terminology you likely want to set two different channel 
> names, but the same callsign.
>
Wasn't there a OneHD at one point.



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