[mythtv-commits] Ticket #12508: Some channels in Hong Kong not covered

[MythTV]

#12508: Some channels in Hong Kong not covered
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 Reporter:  Walter Cheuk <wwycheuk@…>  |          Owner:
     Type:  Bug Report - General       |         Status:  new
 Priority:  minor                      |      Milestone:  unknown
Component:  MythTV - Channel Scanner   |        Version:  0.27-fixes
 Severity:  medium                     |     Resolution:
 Keywords:                             |  Ticket locked:  0
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Comment (by mdean):

 All of the frequencies used in Hong Kong are covered by FREQ_UHF, which is
 included as part of europe-west as well as some other analog frequency
 tables (see
 https://github.com/MythTV/mythtv/blob/master/mythtv/libs/libmythtv/frequencies.cpp#L848
 and line #899).  Hong Kong seems to use the PAL-I broadcast system as well
 as a subset of frequencies that are used in the UK, so europe-west is an
 appropriate choice of frequency table.  (That said, europe-west has
 several channel blocks that aren't used in Hong Kong, while italy
 (pal_italy) and southafrica (pal_bcast_za) have only 10 extra channels and
 newzealand (pal_newzealand) has only 11 extra, so those choices may be
 useful for limiting the time spent scanning unused frequencies--
 southafrica probably being the most "intuitive" choice since it also uses
 PAL-I.)

 Similarly, it looks like the digital channels used by DTMB would be
 covered by the UK digital frequency table (see
 https://github.com/MythTV/mythtv/blob/master/mythtv/libs/libmythtv/frequencytables.cpp#L327
 ), though I'm not sure whether the other values specified for
 dvbt_ofdm_gb0 would apply for DTMB.

 I can't decide whether adding an analog frequency table specifically for
 Hong Kong that includes only FREQ_UHF for analog (with a comment including
 the link to the tvbnet.pdf document you linked, above) would be worthwhile
 for making configuration more intuitive for users in Hong Kong, at least
 through the analog shut off in 2020.  The europe-west frequency table is
 already set as a default in the MythLocale defaults file for Hong Kong (
 https://github.com/MythTV/mythtv/blob/master/mythtv/locales/zh_hk.xml ),
 but the name isn't likely to make users think it's correct unless they
 know that Hong Kong is using a subset of the frequencies used by the UK.

 A digital table specifically for Hong Kong may make sense depending on
 whether FrequencyTable properties need to be modified versus the UK one
 (in which case, it definitely makes sense) or not (in which case it may
 not make sense, even though they're currently using only channels in the
 range from 22 (482MHz) through 62 (802MHz)--only 7 less than UK's 21
 (474MHz) through 68 (850MHz)--but they may be allowed to/eventually use
 more channels--I'm guessing the same UHF block could potentially be used).
 If so, it's down to whether it makes sense to use a more intuitive name.

 So, MythTV's not picking up all your channels is likely due to other
 factors, such as card/driver issues, signal issues, or similar problems
 unrelated to the frequency table.

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Ticket URL: <https://code.mythtv.org/trac/ticket/12508#comment:2>
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