[mythtv-users] Help with unbreaking channels.conf import for 0.25 appreciated

John Pilkington J.Pilk at tesco.net
Tue Mar 20 16:57:18 UTC 2012

On 20/03/12 15:40, Michael T. Dean wrote:
> On 03/20/2012 05:02 AM, Karl Dietz wrote:
>> I'd like to fix the channels.conf import but I've run out of time
>> (I'm relocating in a week) and my simple patch doesn't work as expected.
>> As the channel scanner has some subtle bugs you can make many other
>> users happy if they can fall back to an external scanner (like w_scan)
>> for the 0.25 cycle.
> Of course, fixing* the actual MythTV channel scanner would also make
> users happy.
> Mike
> *Or at least creating detailed bug reports for those subtle bugs.

I think it's worth reporting that I took my laptop from the region 
served by one dvb-t transmitter in the UK last weekend into the region 
served by another, and retuning almost worked as intended; that's with 
0.24-fixes as of last November.

I have a dvb-t/dvb-t2  usb nanostick.  In the mythtv-setup transport 
editor I created a new transport with the known frequency of the dvb-t2 
(HD) multiplex, 8MHz BW and QAM256 modulation.  I then scanned this as a 
'known transport' with 'ignore timeouts' (may be irrelevant) and 'link 
to other transports'. After that my old transports had been deleted and 
four new ones had been found, with netids and transportids showing in 
the editor.  I have not yet detected the fifth SD multiplex from that 
transmitter - I believe it's still on low power - and as before the 
'ids' were not populated for the HD mux.  This time I didn't bother to 
inject them.

After this single scan all SD channels were operational;  there didn't 
appear to be any need to do a new channel scan.  The old one was OK, but 
using this transport-based procedure a new scan (after deleting all 
channels) wouldn't have given problems either.

I've used similar procedures before with a non-dvb-t2-capable tuner but 
it seems to be necessary then to go round the transport-linking loop 
more than once.  Starting with dvb-t2 'just works' apart from the HD 
transport DB injection.

Usual transmitter Waltham, temporary tuning for Sandy Heath.

John P

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