Make sure a ringbuffer switch is checked at least every 10 seconds.

Otherwise, this check is only performed on keyframes, and if there is a
problem with the input we may never see one again, resulting in a wedged
recording.

mythtv/libs/libmythtv/recorders/recorderbase.cpp

@@ -392,6 +392,8 @@ void RecorderBase::CheckForRingBufferSwitch(void)
 
     if (recq && tvrec)
         tvrec->RingBufferChanged(ringBuffer, curRecording, recq);
+
+    ringBufferCheckTimer.restart();
 }
 
 void RecorderBase::SetRecordingStatus(RecStatus::Type status,
@@ -636,6 +638,18 @@ void RecorderBase::SavePositionMap(bool force, bool finished)
     {
         positionMapLock.unlock();
     }
+
+    // Make sure a ringbuffer switch is checked at least every 10
+    // seconds.  Otherwise, this check is only performed on keyframes,
+    // and if there is a problem with the input we may never see one
+    // again, resulting in a wedged recording.
+    if (ringBufferCheckTimer.isRunning() &&
+        ringBufferCheckTimer.elapsed() > 10000)
+    {
+        LOG(VB_RECORD, LOG_WARNING, LOC + "It is has been over 10 seconds "
+            "since we've checked for a ringbuffer switch.");
+        CheckForRingBufferSwitch();
+    }
 }
 
 void RecorderBase::TryWriteProgStartMark(const frm_pos_map_t &durationDeltaCopy)

mythtv/libs/libmythtv/recorders/recorderbase.h

@@ -333,6 +333,7 @@ class MTV_PUBLIC RecorderBase : public QRunnable
     QMutex         nextRingBufferLock;
     RingBuffer    *nextRingBuffer;
     RecordingInfo *nextRecording;
+    MythTimer      ringBufferCheckTimer;
 
     // Seektable  support
     MarkTypes      positionMapType;