Mine

Index: libs/libmythtv/NuppelVideoPlayer.cpp
===================================================================
--- libs/libmythtv/NuppelVideoPlayer.cpp	(revision 20878)
+++ libs/libmythtv/NuppelVideoPlayer.cpp	(working copy)
@@ -1039,7 +1039,7 @@
         return;
 
     SetScanType((m_scan_tracker > min_count) ? kScan_Interlaced : kScan_Progressive);
-    m_scan_locked  = false;
+    m_scan_locked  = (m_scan_tracker > min_count && !player_ctx->buffer->isDVD());
 }
 
 void NuppelVideoPlayer::SetScanType(FrameScanType scan)