Index: mythtv/libs/libmythtv/NuppelVideoPlayer.cpp
===================================================================
--- mythtv/libs/libmythtv/NuppelVideoPlayer.cpp	(revision 22866)
+++ mythtv/libs/libmythtv/NuppelVideoPlayer.cpp	(working copy)
@@ -1069,13 +1069,17 @@
 
     m_scan_locked = (scan != kScan_Detect);
 
-    if (scan == m_scan)
+    if (scan == m_scan) {
+        bool interlaced = m_deint_possible && is_interlaced(scan);
+        videosync->SetFrameInterval(frame_interval, interlaced);
         return;
+    }
 
     bool interlaced = is_interlaced(scan);
     if (interlaced && !m_deint_possible)
     {
         m_scan = scan;
+        videosync->SetFrameInterval(frame_interval, false);
         return;
     }
 
@@ -1109,11 +1113,8 @@
         if (kScan_Progressive == scan)
         {
             m_double_process = false;
-            if (m_double_framerate)
-            {
-                m_double_framerate = false;
-                videosync->SetFrameInterval(frame_interval, false);
-            }
+            m_double_framerate = false;
+            videosync->SetFrameInterval(frame_interval, false);
             videoOutput->SetDeinterlacingEnabled(false);
             VERBOSE(VB_PLAYBACK, "Disabled deinterlacing");
         }