[mythtv-users] Do multiple sources need multiple .xmltv files?

[Mike Perkins]

On 23/10/12 14:03, Martin Moores wrote:
> On 22 October 2012 11:19, Mike Perkins <mikep at randomtraveller.org.uk> wrote:
>
>>
>> My policy was to treat the HD channels as an entirely separate source to
>> the SD channels. I therefore have SD tuners which scan 5 transports and the
>> xmltv file is edited accordingly. The HD channels are all on a single
>> transport (for now) and there are presently only four of them, so the xmltv
>> for these is easy.
>>
>> By doing it this way the HD tuner cannot get pre-empted by the scheduler
>> wanting to record an SD-only program. It is always available for recording
>> HD.
>>
>> Don't muck about with the channel names, just leave them as they are. If
>> there are duplicates of the programming on HD and SD these will show up on
>> mythweb or in the front end and you can pick whichever you want.
>>
>> It may also be a mistake to believe that the HD channels carry *exactly*
>> the same programming as the corresponding SD channel. Usually, but not
>> always. In addition, the "BBC HD" channel may carry a variety of programs
>> from different BBC origins.
>>
>
>
> Mike,
>
> Thanks for the info.
>
> Well, I think I have got to the bottom of my issues.  Was sat in work
> yesterday and had a bit of a realisation about my dual tuner and how I had
> set it up.  Will document it here in case anyone might find it useful!
>
> The tuner is dual, as in SD and HD, I had set it up as a dual tuner, with
> the same source, as in SD/HD and SD/HD, which was not the case.
>
> So I started setting it all up again, I now have 3 sources, 1 for my
> original SD freeview card and 2 for my new SD/HD card.  I can't use the
> same SD source across both cards, as they seem to tune slightly different
> SD channels between them, so thought it would be easier to have 2 sources.
>
> I then connected the tuners to the sources, the 1st priority being the HD
> tuner, then SD on the second card etc etc, re-scanned on them all and
> exited.
>
> Then, ran mythupchuk and created an xmltv file by running tv_grabber_uk_rt
> --configure and made 3 copied of this in /home/mythtv/.mythtv all named
> after the 3 sources.
>
> I commented everything out apart from the HD channels in the xmltv file for
> the HD source, I had to add ITV HD manually, as tv_grabber_uk_rt does not
> seem to add this one.
>
> I then ran through mythweb channel editor, checking that EIT was turned on
> for channels with no xmltv ID and visa versa.
>
> I then ran mythfilldatabase and checked through any xmltv IDs it complained
> about.  There were a few that mythupchuk had added incorrectly into the
> database, which I edited in mythweb to the correct ones from my xmltv
> file.  There were also some IDs that I did not have a channel for, so
> commented those out.
>
> After a few runs and re-checking files, mythfilldatabase ran successfully
> and my upcoming recordings looked good, everything recording in HD where
> appropriate.
>
> So that sums it up, thanks all for the pointers, got there in the end,
> hopefully won't need to re-tune again soon!  Now I just need to sort out
> why my machine is glitching when recording the HD, dodgey cables me thinks.
>
Yep. I'd forgotten I had to do that for ITV HD as well. I ended up running the 
grabber script once more with --configure and choosing 'all' to get a complete 
list of everything, then using the London ITV HD line out of that. Seems to work...

Don't forget that the transmitting power of the HD multiplex may be lower than 
that of the SD muxes. You may need an amp or to make sure your aerial is 
accurately positioned. The tuner just dumps the transmission to disk, so I'm not 
sure about the different sensitivity of an HD tuner vs. SD but the different 
format (H264 vs. MPEG2-TS) may be less resilient to glitches.

-- 

Mike Perkins