diff -urN mplayer-1.0_rc2_p20090530-orig/cfg-mencoder.h mplayer-1.0_rc2_p20090530/cfg-mencoder.h
--- mplayer-1.0_rc2_p20090530-orig/cfg-mencoder.h	2009-05-29 10:53:39 +0900
+++ mplayer-1.0_rc2_p20090530/cfg-mencoder.h	2009-06-02 00:22:33 +0900
@@ -175,6 +175,7 @@
 	{"skiplimit", &skip_limit, CONF_TYPE_INT, 0, 0, 0, NULL},
 	{"noskiplimit", &skip_limit, CONF_TYPE_FLAG, 0, 0, -1, NULL},
 	{"noskip", &skip_limit, CONF_TYPE_FLAG, 0, 0, 0, NULL},
+	{"nodup", &dup_limit, CONF_TYPE_FLAG, 0, 0, 0, NULL},
 
 	{"audio-density", &audio_density, CONF_TYPE_INT, CONF_RANGE|CONF_GLOBAL, 1, 50, NULL},
 	{"audio-preload", &audio_preload, CONF_TYPE_FLOAT, CONF_RANGE|CONF_GLOBAL, 0, 2, NULL},
diff -urN mplayer-1.0_rc2_p20090530-orig/mencoder.c mplayer-1.0_rc2_p20090530/mencoder.c
--- mplayer-1.0_rc2_p20090530-orig/mencoder.c	2009-05-29 10:53:39 +0900
+++ mplayer-1.0_rc2_p20090530/mencoder.c	2009-06-02 00:22:33 +0900
@@ -156,6 +156,7 @@
 double force_fps=0;
 static double force_ofps=0; // set to 24 for inverse telecine
 static int skip_limit=-1;
+static int dup_limit=-1;
 float playback_speed=1.0;
 
 static int force_srate=0;
@@ -1328,7 +1329,7 @@
 videosamples++;
 videorate+=(GetTimerMS() - ptimer_start);
 
-if(skip_flag<0){
+if(dup_limit!=0 && skip_flag<0){
     // duplicate frame
 	if(!quiet) mp_msg(MSGT_MENCODER, MSGL_WARN, MSGTR_DuplicateFrames,-skip_flag);
     while(skip_flag<0){