diff --git a/sjplayer/src/sjplayer/ScheduledControllerInterface.d b/sjplayer/src/sjplayer/ScheduledControllerInterface.d
index aa875ad..244bd99 100644
--- a/sjplayer/src/sjplayer/ScheduledControllerInterface.d
+++ b/sjplayer/src/sjplayer/ScheduledControllerInterface.d
@@ -35,8 +35,9 @@ abstract class AbstractScheduledController : ScheduledControllerInterface {
       assert(next_operation_index_ <= operations_.length);
 
       const last_operation = &operations_[next_operation_index_-1];
-      if (IsTimeInPeriod(time, last_operation.period)) {
-        ProcessOperation(time, *last_operation);
+      const period         = last_operation.period;
+      if (IsTimeInPeriod(time, period)) {
+        ProcessOperation(period.ConvertToRelativeTime(time), *last_operation);
         return;
       }
       FinalizeOperation(*last_operation);
@@ -47,7 +48,8 @@ abstract class AbstractScheduledController : ScheduledControllerInterface {
     const next_operation = &operations_[next_operation_index_];
     if (IsTimeInPeriod(time, next_operation.period)) {
       PrepareOperation(*next_operation);
-      ProcessOperation(time, *next_operation);
+      ProcessOperation(
+          next_operation.period.ConvertToRelativeTime(time), *next_operation);
       ++next_operation_index_;
     }
   }
diff --git a/sjplayer/src/sjplayer/util/Period.d b/sjplayer/src/sjplayer/util/Period.d
index d0bfc9b..72660dc 100644
--- a/sjplayer/src/sjplayer/util/Period.d
+++ b/sjplayer/src/sjplayer/util/Period.d
@@ -12,3 +12,9 @@ bool IsTimeInPeriod(float time, in Period period) {
 bool IsPeriodIntersectedToPeriod(in Period p1, in Period p2) {
   return p1.start < p2.end && p2.start < p1.end;
 }
+
+///
+float ConvertToRelativeTime(in Period period, float src)
+    in (period.start < period.end) {
+  return (src - period.start) / (period.end - period.start);
+}