--- bitstream.c	2003/03/15 14:32:56	1.39.2.2
+++ bitstream.c	2003/03/15 17:03:17	1.39.2.3
@@ -1204,8 +1204,12 @@
 
 	WRITE_MARKER();
 
-	BitstreamPutBit(bs, 1);		// fixed_vop_rate = 1
-	BitstreamPutBits(bs, pParam->fincr, log2bin(pParam->fbase));	// fixed_vop_time_increment
+    if (pParam->fincr>0) {
+	    BitstreamPutBit(bs, 1);		// fixed_vop_rate = 1
+	    BitstreamPutBits(bs, pParam->fincr, log2bin(pParam->fbase));	// fixed_vop_time_increment
+    }else{
+        BitstreamPutBit(bs, 0);		// fixed_vop_rate = 0
+    }
 
 	WRITE_MARKER();
 	BitstreamPutBits(bs, pParam->width, 13);	// width