diff --git a/lib/dtsc.cpp b/lib/dtsc.cpp
index 8d84b012..0885d57c 100644
--- a/lib/dtsc.cpp
+++ b/lib/dtsc.cpp
@@ -3332,6 +3332,38 @@ namespace DTSC{
     // return is by reference
   }
 
+  /// Returns true if the tracks idx1 and idx2 are keyframe aligned
+  bool Meta::keyTimingsMatch(size_t idx1, size_t idx2) const {
+    const DTSC::Track &t1 = tracks.at(idx1);
+    const DTSC::Track &t2 = tracks.at(idx2);
+    uint64_t t1Firstms = t1.track.getInt(t1.trackFirstmsField);
+    uint64_t t2Firstms = t2.track.getInt(t2.trackFirstmsField);
+    uint64_t firstms = t1Firstms > t2Firstms ? t1Firstms : t2Firstms;
+
+    uint64_t t1Lastms = t1.track.getInt(t1.trackFirstmsField);
+    uint64_t t2Lastms = t2.track.getInt(t2.trackFirstmsField);
+    uint64_t lastms = t1Lastms > t2Lastms ? t1Lastms : t2Lastms;
+
+    if (firstms > lastms) {
+      WARN_MSG("Cannot check for timing alignment for tracks %zu and %zu: No overlap", idx1, idx2);
+      return false;
+    }
+
+    uint32_t keyIdx1 = getKeyIndexForTime(idx1,firstms);
+    uint32_t keyIdx2 = getKeyIndexForTime(idx2,firstms);
+
+    DTSC::Keys keys1(tracks.at(idx1).keys);
+    DTSC::Keys keys2(tracks.at(idx2).keys);
+
+    while(true) {
+      if (lastms < keys1.getTime(keyIdx1) || lastms < keys2.getTime(keyIdx2)) {return true;}
+      if (keys1.getTime(keyIdx1) != keys2.getTime(keyIdx2)) {return false;}
+      keyIdx1++;
+      keyIdx2++;
+    }
+    return true;
+  }
+
   Parts::Parts(const Util::RelAccX &_parts) : parts(_parts){
     sizeField = parts.getFieldData("size");
     durationField = parts.getFieldData("duration");
diff --git a/lib/dtsc.h b/lib/dtsc.h
index 59d4f79f..7debe215 100644
--- a/lib/dtsc.h
+++ b/lib/dtsc.h
@@ -450,6 +450,7 @@ namespace DTSC{
     size_t getPageNumberForTime(uint32_t idx, uint64_t time) const;
     size_t getPageNumberForKey(uint32_t idx, uint64_t keynumber) const;
     size_t getKeyNumForTime(uint32_t idx, uint64_t time) const;
+    bool keyTimingsMatch(size_t idx1, size_t idx2) const;
 
     const Util::RelAccX &parts(size_t idx) const;
     Util::RelAccX &keys(size_t idx);