Fix MPTS channel creation

MPTS channel creation can be selected at the channel scan; if selected
then one additional channel is created per transport stream which can
be used to make recordings of the complete transport stream.
An MPTS channel is created as a copy of an existing channel in the
same transport stream. It did however happen that during the
post processing the MPTS channel was discarded because of the
"Logical Channel Numbers Required" or the "Complete Scan Data Required"
options when the existing channel did not meet these criteria.
This is now fixed by selecting an existing channel that has
"Complete Scan Data", i.e. it does appear in PAT and PMT, and
by setting a value for the logical channel number.

mythtv/libs/libmythtv/channelscan/channelscan_sm.cpp

@@ -548,12 +548,7 @@ void ChannelScanSM::HandleBAT(const BouquetAssociationTable *bat)
             ServiceListDescriptor services(serv_list);
             if (!authority.IsValid() || !services.IsValid())
                 continue;
-#if 0
-            LOG(VB_CHANSCAN, LOG_DEBUG, LOC +
-                QString("Found default authority '%1' in BAT for services in nid %2 tid %3")
-                    .arg(authority.DefaultAuthority())
-                    .arg(netid).arg(tsid));
-#endif
+
             for (uint j = 0; j < services.ServiceCount(); ++j)
             {
                 // If the default authority is given in the SDT this
@@ -575,12 +570,12 @@ void ChannelScanSM::HandleBAT(const BouquetAssociationTable *bat)
 void ChannelScanSM::HandleSDTo(uint tsid, const ServiceDescriptionTable *sdt)
 {
     QMutexLocker locker(&m_lock);
-
-    LOG(VB_CHANSCAN, LOG_INFO, LOC +
+#if 0
+    LOG(VB_CHANSCAN, LOG_DEBUG, LOC +
         QString("Got a Service Description Table (other) for Transport ID %1 section %2/%3")
             .arg(tsid).arg(sdt->Section()).arg(sdt->LastSection()));
     LogLines(sdt->toString());
-
+#endif
     m_otherTableTime = std::chrono::milliseconds(m_timer.elapsed()) + m_otherTableTimeout;
 
     uint netid = sdt->OriginalNetworkID();
@@ -1832,17 +1827,35 @@ ScanDTVTransportList ChannelScanSM::GetChannelList(bool addFullTS) const
 
         if (!item.m_channels.empty())
         {
+            // Add a MPTS channel which can be used to record the entire transport
+            // stream multiplex. These recordings can be used in stream analyzer software.
             if (addFullTS)
             {
-                /* If addFullTS, then add a 'MPTS' channel
-                   which can be used to record the entire MPTS from
-                   the transport. */
-                dbchan_it = pnum_to_dbchan.begin();
-                ChannelInsertInfo info = *dbchan_it;
-
-                // Use transport stream ID as (fake) service ID
-                // to use in callsign and as channel number
+                // Find the first channel that is present in PAT/PMT and use that as
+                // template for the new MPTS channel.
+                ChannelInsertInfo info {};
+                for (auto & channel : pnum_to_dbchan)
+                {
+                    if (channel.m_inPat && channel.m_inPmt)
+                    {
+                        info = channel;
+                        break;
+                    }
+                }
+
+                // If we cannot find a valid channel then use the first channel in
+                // the list as template for the new MPTS channel.
+                if (info.m_serviceId == 0)
+                {
+                    dbchan_it = pnum_to_dbchan.begin();
+                    info = *dbchan_it;
+                }
+
+                // Use transport stream ID as (fake) service ID to use in callsign
+                // and as channel number.
                 info.m_serviceId = info.m_sdtTsId ? info.m_sdtTsId : info.m_patTsId;
+                info.m_chanNum = QString("%1").arg(info.m_serviceId);
+                info.m_logicalChannel = info.m_serviceId;
 
                 if (tuner_type == DTVTunerType::kTunerTypeASI)
                 {