Index: DOCS/man/en/mplayer.1
===================================================================
--- DOCS/man/en/mplayer.1	(revision 19808)
+++ DOCS/man/en/mplayer.1	(working copy)
@@ -1666,6 +1666,7 @@
 For bsdbt848 and v4l, PAL, SECAM, NTSC are available.
 For v4l2, see the console output for a list of all available norms,
 also see the normid option below.
+If you can leave current norm, use norm=nochange
 .IPs "normid=<value> (v4l2 only)"
 Sets the TV norm to the given numeric ID.
 The TV norm depends on the capture card.
Index: stream/tv.c
===================================================================
--- stream/tv.c	(revision 19808)
+++ stream/tv.c	(working copy)
@@ -226,12 +226,15 @@
 	}
     } else {
 #endif
-    /* select video norm */
-    tvh->norm = norm_from_string(tvh, tv_param_norm);
+    /* if not leave current norm */
+    if (strcmp(tv_param_norm, "nochange")) {
+        /* select video norm */
+	tvh->norm = norm_from_string(tvh, tv_param_norm);
 
-    mp_msg(MSGT_TV, MSGL_V, "Selected norm: %s\n", tv_param_norm);
-    if (funcs->control(tvh->priv, TVI_CONTROL_TUN_SET_NORM, &tvh->norm) != TVI_CONTROL_TRUE) {
-	mp_msg(MSGT_TV, MSGL_ERR, "Error: Cannot set norm!\n");
+        mp_msg(MSGT_TV, MSGL_V, "Selected norm: %s\n", tv_param_norm);
+        if (funcs->control(tvh->priv, TVI_CONTROL_TUN_SET_NORM, &tvh->norm) != TVI_CONTROL_TRUE) {
+		mp_msg(MSGT_TV, MSGL_ERR, "Error: Cannot set norm!\n");
+        }
     }
 #ifdef HAVE_TV_V4L2
     }