skip deblocking and motion interpolation when using only I-frames

git-svn-id: svn://svn.videolan.org/x264/trunk@593 df754926-b1dd-0310-bc7b-ec298dee348c

encoder/encoder.c

@@ -1600,7 +1600,7 @@ do_encode:
     x264_ratecontrol_end( h, i_frame_size * 8 );
 
     /* handle references */
-    if( i_nal_ref_idc != NAL_PRIORITY_DISPOSABLE )
+    if( i_nal_ref_idc != NAL_PRIORITY_DISPOSABLE && h->param.i_keyint_max > 1 )
         x264_reference_update( h );
 #ifdef DEBUG_DUMP_FRAME
     else