diff -NEbaurw avidemux-2.1.2old/avidemux/ADM_codecs/ADM_x264.cpp avidemux-2.1.2/avidemux/ADM_codecs/ADM_x264.cpp
--- avidemux-2.1.2old/avidemux/ADM_codecs/ADM_x264.cpp	2005-06-08 19:23:13.000000000 +0200
+++ avidemux-2.1.2/avidemux/ADM_codecs/ADM_x264.cpp	2006-08-01 19:44:08.778225250 +0200
@@ -200,7 +200,13 @@
 {
   memset(&param,0,sizeof(param));
   x264_param_default( &param );
+#if X264_BUILD < 48
   param.rc.b_cbr=1;
+#else
+  /* X264_RC_CQP with qp constant 0 is used instead of b_cbr in x264 r48 */
+  param.rc.i_rc_method = X264_RC_CQP;
+  param.rc.i_qp_constant = 0;
+#endif
   param.rc.i_bitrate=val/1000;  
 //  param.rc.i_rc_buffer_size=val/1000;
 //  param.rc.i_rc_init_buffer=(val/1000)>>1;
@@ -234,7 +240,13 @@
   memset(&param,0,sizeof(param));
   x264_param_default( &param );
   
+#if X264_BUILD < 48
   param.rc.b_cbr=1;
+#else
+  /* X264_RC_CQP with qp constant 0 is used instead of b_cbr in x264 r48 */
+  param.rc.i_rc_method = X264_RC_CQP;
+  param.rc.i_qp_constant = 0;
+#endif
   param.rc.i_bitrate=val;  
   //param.rc.i_rc_buffer_size=val;
   //param.rc.i_rc_init_buffer=val>>1;