[mythtv-commits] Ticket #13371: HDHomeRun DVB-C device seen as DVB-T

MythTV noreply at mythtv.org
Sat Jan 12 22:12:34 UTC 2019

#13371: HDHomeRun DVB-C device seen as DVB-T
 Reporter:  Klaas de Waal                        |          Owner:  (none)
     Type:  Bug Report - General                 |         Status:  new
 Priority:  minor                                |      Milestone:
                                                 |  needs_triage
Component:  MythTV - Channel Scanner             |        Version:
                                                 |  Unspecified
 Severity:  medium                               |     Resolution:
 Keywords:  DVB DVB-C channelscan HDHomeRun      |  Ticket locked:  0
  HDHR3-4DC                                      |

Comment (by Klaas de Waal):

 Created a first patch that implements (1) above, change tuner type to
 DVB-C for the HDHomeRun DVB-C devices.\\

 Created a second patch that modifies format_dvbc in hdhrchannel.cpp to
 generate a tuning string when modulation and symbol rate are specified but
 the bandwidth is not. In that case the bandwidth is set to 8MHz.\\

 Some exploratory programming to implement (2) and (3), bandwidth
 selection, gives the insight that the "Full Scan (Tuned)" only specifies
 the parameters for the first transport; the NIT is then parsed and that
 gives the tuning parameters for all other transports in the cable system
 delivery descriptors. For DVB-C, the delivery descriptors do not include
 the bandwidth and hence the 'a' (auto) is used to tune the other
 At this moment, replacing the 'a' with the selected bandwidth everywhere
 looks rather complicated and is maybe not the way forward.\\

 A question is also how useful it is to support DVB-C channels that do not
 have 8MHz bandwidth. According to the Dutch Wikipedia all European
 countries use 8MHz DVB-C channels so the attached patches could be good

Ticket URL: <https://code.mythtv.org/trac/ticket/13371#comment:1>
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