diff --git a/mencoder.c b/mencoder.c
index 70ace195d6..dc0773058b 100644
--- a/mencoder.c
+++ b/mencoder.c
@@ -353,7 +353,7 @@ divx4_param.rc_reaction_ratio  = 20;
 
   printf("success: format: %d  data: 0x%X - 0x%X\n",file_format, (int)(stream->start_pos),(int)(stream->end_pos));
 
-  if(stream_cache_size) stream_enable_cache(stream,stream_cache_size*1024);
+  if(stream_cache_size) stream_enable_cache(stream,stream_cache_size*1024,0,0);
 
   //demuxer=demux_open(stream,file_format,video_id,audio_id,dvdsub_id);
   demuxer=demux_open(stream,file_format,audio_id,video_id,dvdsub_id);
diff --git a/mplayer.c b/mplayer.c
index d603b6ede5..99d3ea0fb2 100644
--- a/mplayer.c
+++ b/mplayer.c
@@ -821,7 +821,8 @@ if(stream_dump_type==5){
 #endif
   current_module=NULL;
 
-  if(stream_cache_size) stream_enable_cache(stream,stream_cache_size*1024);
+    // initial prefill: 20%  later: 5%  (should be set by -cacheopts)
+  if(stream_cache_size) stream_enable_cache(stream,stream_cache_size*1024,stream_cache_size*1024/5,stream_cache_size*1024/20);
 
   use_stdin=filename && (!strcmp(filename,"-"));