[mythtv-users] Freeview BBC Mux Break Up On Some Recordings Then Fine On Other Recordings

John Pilkington J.Pilk at tesco.net
Sat Apr 6 17:20:58 UTC 2013


On 06/04/13 15:35, nospam312 wrote:
>         Is it signal related. My hauppauge tuners are susceptible to both
>         signals that are too weak or too strong
>
>         Martin
>
>
>     That's certainly the most obvious question. Are you in the middle of
>     a forest/behind a large construction site/trying to use an an indoor
>     aerial?
>
>     What does mythtvsetup show for your Transports?  For a main-service
>     area location there should probably be 5 and only 5 SD transports,
>     each with a transport-id  and a net-id.  If it's not like that try
>     retuning; see eg Ticket #10217 comment 15.  I used an HD tuner for
>     that, but the general idea is similar if you have only SD.
>
>
> I think the aerial is fine as I have no problems when used on the TV.
> The aerial is on the roof good line of sight.
>
> All other channels and muxes are fine also.  I am SD only - no HD.  I
> only have 5 multiplexes in the dtv_multiplex table and 5 unique pat_tsid
> in the channelscan_channel table.
>
> It is a bit strange that it is only the BBC mux that has the problem.
>
> When tuning the signal strength is between 65-70% depending on multiplex
> so it seems to be ok (that does not seem too strong or too weak).
>
> I think the BBC multiplex is moving soon due to 4G reorganisation I will
> cross fingers and hope that solves it.
>
> Thanks

It's always possible, of course, that you have some local problem.

I'm not sure that I know which device you have, if it features here, or 
if more info about it is available.

http://linuxtv.org/wiki/index.php/DVB-T_USB_Devices

I had problems with a Freecom/WideView device, purchased around 2006, 
because it included a hardware PID filter with only 15 'slots'.  One 
symptom was a continuous stream of error messages when it was in use.

The wiki says the filter limits the number of simultaneous channels, and 
that's more likely to affect the BBC mux.  That mux also has lots of 
radio channels, and a limited device might do worse because of that. 
This oughtn't to be a problem if dmesg says the device 'will pass all 
streams to the demuxer';  if it doesn't you might consider getting 
something else.

John P







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