[mythtvnz] http://epg.org.nz/freeview.xml.gz

[Stephen Worthington]

On Mon, 25 Mar 2013 15:24:36 +1300, you wrote:

>On 25/03/13 03:08, Stephen Worthington wrote:
>> I have run mhegepgsnoop.py (0.5.1) with the -v (verbose) option, and 
>> it seems that my problem is caused by its fuzzy channel matching - it 
>> is picking up the wrong channels from my MythTV database when it 
>> matches them against my channels. Having all the Sky versions of the 
>> Freeview channels in my database is what is triggering the problem. I 
>> will have a look tomorrow to see if I can make a modification to the 
>> channel lookups so that it will only match against DVB-T channels.
>
>I have just discovered a related problem with the fuzzy channel matching 
>on my system. I'm getting Canterbury Television matched against 
>fv-maoritelevision. And I'm in Auckland. :) Not sure if there is a bug 
>in how I use the fuzzy matching lib or I'm just unlucky with channel 
>names. I'm thinking about adding another option to exclude specific 
>channels discovered in the MHEG data. Or try and improve fuzzy matching. 
>Or both. Don't hold your breath waiting for a fix from me...

It seems that the correct spelling of Maori with a macron over the o
character in the MHEG5 data is confusing things.  I am working on a
possible fix for that at the moment.  I think I already have a fix
that makes the fuzzy matching only work on the DVB-T channels, which
is to change the select query used to get the MythTV channel data to:

select callsign, name, xmltvid from channel c, dtv_multiplex d where
c.mplexid is not NULL and c.mplexid = d.mplexid and d.mod_sys !=
'DVB-S'

(This is in two places in the mhegepgsnoop.py file).  This fix needs
testing on databases other than mine that have satellite Freeview
channels and/or Sky channels, to make sure the database fields all
work the way I thing they do.


I also have a crude fix for the drivers returning invalid values, by
catching the IndexError exception:

	verbose('\nParameters read back from device. Might not be
accurate?\n') # Why are some of these values wrong? Driver/firmware
bugs?
	verbose('Frequency = ' + str(feparams.frequency) + '\n')
	try:
		verbose('Inversion = ' + str(feparams.inversion) + ' =
' + fe_spectral_inversion[feparams.inversion] + '\n')
	except IndexError:
		verbose('Inversion = ' + str(feparams.inversion) + ' =
***IndexError***\n')
	try:
		verbose('Bandwidth = ' +
str(feparams.u.ofdm.bandwidth) + ' = ' +
fe_bandwidth[feparams.u.ofdm.bandwidth] + '\n')
	except IndexError:
		verbose('Bandwidth = ' +
str(feparams.u.ofdm.bandwidth) + ' = ***IndexError***\n')
	try:
		verbose('Transmission mode = ' +
str(feparams.u.ofdm.transmission_mode) + ' = ' +
fe_transmit_mode[feparams.u.ofdm.transmission_mode] + '\n')
	except IndexError:
		verbose('Transmission mode = ' +
str(feparams.u.ofdm.transmission_mode) + ' = ***IndexError***\n')
	try:
		verbose('HP code rate = ' +
str(feparams.u.ofdm.code_rate_HP) + ' = ' +
fe_code_rate[feparams.u.ofdm.code_rate_HP] + '\n')
	except IndexError:
		verbose('HP code rate = ' +
str(feparams.u.ofdm.code_rate_HP) + ' = ***IndexError***\n')
	try:
		verbose('LP code rate = ' +
str(feparams.u.ofdm.code_rate_LP) + ' = ' +
fe_code_rate[feparams.u.ofdm.code_rate_LP] + '\n')
	except IndexError:
		verbose('LP code rate = ' +
str(feparams.u.ofdm.code_rate_LP) + ' = ***IndexError***\n')
	try:
		verbose('Constellation = ' +
str(feparams.u.ofdm.constellation) + ' = ' +
fe_modulation[feparams.u.ofdm.constellation] + '\n')
	except IndexError:
		verbose('Constellation = ' +
str(feparams.u.ofdm.constellation) + ' = ***IndexError***\n')
	try:
		verbose('Guard interval = ' +
str(feparams.u.ofdm.guard_interval) + ' = ' +
fe_guard_interval[feparams.u.ofdm.guard_interval] + '\n')
	except IndexError:
		verbose('Guard interval = ' +
str(feparams.u.ofdm.guard_interval) + ' = ***IndexError***\n')
	try:
		verbose('Hierarchy = ' +
str(feparams.u.ofdm.hierarchy_information) + ' = ' +
fe_hierarchy[feparams.u.ofdm.hierarchy_information] + '\n')
	except IndexError:
		verbose('Hierarchy = ' +
str(feparams.u.ofdm.hierarchy_information) + ' = ***IndexError***\n')