Index: muxers.c
===================================================================
--- muxers.c	(revision 659)
+++ muxers.c	(working copy)
@@ -30,6 +30,14 @@
 #include "matroska.h"
 #include "muxers.h"
 
+#ifdef _MSC_VER
+/* LARGEFILE support */
+
+#define fseek _fseeki64
+#define ftell _ftelli64
+
+#endif
+
 #ifndef _MSC_VER
 #include "config.h"
 #endif
@@ -245,7 +253,7 @@
 {
     y4m_input_t *h             = handle;
     int          i_frame_total = 0;
-    off_t        init_pos      = ftell(h->fh);
+    int64_t        init_pos      = ftell(h->fh);
 
     if( !fseek( h->fh, 0, SEEK_END ) )
     {
Index: x264.c
===================================================================
--- x264.c	(revision 659)
+++ x264.c	(working copy)
@@ -36,6 +36,12 @@
 #ifdef _MSC_VER
 #include <io.h>     /* _setmode() */
 #include <fcntl.h>  /* _O_BINARY */
+
+/* LARGEFILE support */
+
+#define fseek _fseeki64
+#define ftell _ftelli64
+
 #endif
 
 #ifndef _MSC_VER