Count keyframes on queuePacket so that analysis Ready() will start when out of order packets are present

src/zm_packetqueue.cpp

@@ -107,6 +107,17 @@ bool PacketQueue::queuePacket(std::shared_ptr<ZMPacket> add_packet) {
         }
         rit++;
       }  // end while
+    } else if (!max_keyframe_interval_ and add_packet->keyframe) {
+      auto rit = pktQueue.rbegin();
+      int packet_count = 0;
+      while (rit != pktQueue.rend()) {
+        if ((*rit)->packet->stream_index == add_packet->packet->stream_index) {
+          if ((*rit)->keyframe) break;
+          packet_count ++;
+        }
+      }
+      Debug(1, "Have keyframe interval: %d", packet_count);
+      max_keyframe_interval_ = packet_count;
     }
 
     pktQueue.push_back(add_packet);