Ticket #4637: vsync.diff

libs/libmythtv/vsync.cpp

@@ -117 +117 @@
     m_frame_interval(frameint), m_refresh_interval(refreshint),
     m_interlaced(halve_frame_interval) 
 {
-    if (m_interlaced && m_refresh_interval > m_frame_interval/2)
+    int tolerance = m_refresh_interval >> 6;
+    if (m_interlaced && m_refresh_interval > ((m_frame_interval/2) + tolerance))
         m_interlaced = false; // can't display both fields at 2x rate
 
     //cout << "Frame interval: " << m_frame_interval << endl;
@@ -133 +134 @@
  */
 void VideoSync::SetFrameInterval(int fr, bool intr)
 {
+    int tolerance = m_refresh_interval >> 6;
     m_frame_interval = fr;
     m_interlaced = intr;
-    if (m_interlaced && m_refresh_interval > m_frame_interval/2)
+    if (m_interlaced && m_refresh_interval > ((m_frame_interval/2) + tolerance))
         m_interlaced = false; // can't display both fields at 2x rate
 
     VERBOSE(VB_PLAYBACK, QString("Set video sync frame interval to %1")