diff --git a/src/io.cpp b/src/io.cpp
index 841d9dc3..ebf48ff6 100644
--- a/src/io.cpp
+++ b/src/io.cpp
@@ -29,6 +29,20 @@ namespace Mist {
 
   }
 
+  /// Returns the ID of the main selected track, or 0 if no tracks are selected.
+  /// The main track is the first video track, if any, and otherwise the first other track.
+  long unsigned int InOutBase::getMainSelectedTrack(){
+    if (!selectedTracks.size()){
+      return 0;
+    }
+    for (std::set<long unsigned int>::iterator it = selectedTracks.begin(); it != selectedTracks.end(); it++){
+      if (myMeta.tracks.count(*it) && myMeta.tracks[*it].type == "video"){
+        return *it;
+      }
+    }
+    return *(selectedTracks.begin());
+  }
+
   void negotiationProxy::clear(){
     pagesByTrack.clear();
     trackOffset.clear();
diff --git a/src/io.h b/src/io.h
index c95e4d90..a04d4f3a 100644
--- a/src/io.h
+++ b/src/io.h
@@ -70,6 +70,7 @@ namespace Mist {
       void bufferFinalize(unsigned long tid);
       void bufferRemove(unsigned long tid, unsigned long pageNumber);
       virtual void bufferLivePacket(const DTSC::Packet & packet);
+      long unsigned int getMainSelectedTrack();
     protected:
       void continueNegotiate(unsigned long tid, bool quickNegotiate = false);
       void continueNegotiate();
diff --git a/src/output/output.cpp b/src/output/output.cpp
index 4802da44..f79cffce 100644
--- a/src/output/output.cpp
+++ b/src/output/output.cpp
@@ -771,20 +771,6 @@ namespace Mist{
     return 0;
   }
   
-  /// Returns the ID of the main selected track, or 0 if no tracks are selected.
-  /// The main track is the first video track, if any, and otherwise the first other track.
-  long unsigned int Output::getMainSelectedTrack(){
-    if (!selectedTracks.size()){
-      return 0;
-    }
-    for (std::set<long unsigned int>::iterator it = selectedTracks.begin(); it != selectedTracks.end(); it++){
-      if (myMeta.tracks.count(*it) && myMeta.tracks[*it].type == "video"){
-        return *it;
-      }
-    }
-    return *(selectedTracks.begin());
-  }
-  
   void Output::dropTrack(uint32_t trackId, std::string reason, bool probablyBad){
     //depending on whether this is probably bad and the current debug level, print a message
     unsigned int printLevel = DLVL_INFO;
diff --git a/src/output/output.h b/src/output/output.h
index be875da4..1f3a536e 100644
--- a/src/output/output.h
+++ b/src/output/output.h
@@ -50,7 +50,6 @@ namespace Mist {
       uint64_t startTime();
       uint64_t endTime();
       void setBlocking(bool blocking);
-      long unsigned int getMainSelectedTrack();
       void updateMeta();
       void selectDefaultTracks();
       bool connectToFile(std::string file);