--- a/media/liboggz/README_MOZILLA
+++ b/media/liboggz/README_MOZILLA
@@ -1,4 +1,9 @@
-The source from this directory was copied from the liboggz-0.9.7 source
-distribution using the update.sh script. The only changes made were
-those applied by update.sh and the addition/upate of Makefile.in files
-for the Mozilla build system.
+The source from this directory was copied from the liboggz-0.9.7
+source distribution using the update.sh script. The only changes made
+were those applied by update.sh, which applies a patch from
+seek.patch, and the addition/upate of Makefile.in files for the
+Mozilla build system.
+
+The seek.patch address a bug in liboggz when a seek call returns an
+error. It also addresses an issue where the guess for the seek
+position can exceed the file size. These will be upstreamed to liboggz.

new file mode 100644
--- /dev/null
+++ b/media/liboggz/seek.patch
@@ -0,0 +1,62 @@
+diff --git a/mozilla/media/liboggz/src/liboggz/oggz_seek.c b/mozilla/media/liboggz/src/liboggz/oggz_seek.c
+index f933d4d..23ffb57 100644
+--- a/mozilla/media/liboggz/src/liboggz/oggz_seek.c
++++ b/mozilla/media/liboggz/src/liboggz/oggz_seek.c
+@@ -486,16 +486,18 @@ oggz_scan_for_page (OGGZ * oggz, ogg_page * og, ogg_int64_t unit_target,
+       serialno = ogg_page_serialno (og);
+       granule_at = ogg_page_granulepos (og);
+       unit_at = oggz_get_unit (oggz, serialno, granule_at);
+ 
+       break;
+ #else
+       do {
+         offset_at = oggz_get_prev_start_page(oggz, og, &granule_at, &serialno);
++        if (offset_at == -1)
++          return -1;
+         unit_at = oggz_get_unit(oggz, serialno, granule_at);
+       } while (unit_at > unit_target);
+       return offset_at;
+ #endif
+     } else if (unit_at == unit_target) {
+ #ifdef DEBUG
+       printf (" scan: (%lld) == (%lld)\n", unit_at, unit_target);
+ #endif
+@@ -552,16 +554,19 @@ oggz_seek_guess (ogg_int64_t unit_at, ogg_int64_t unit_target,
+     printf ("oggz_seek_guess: unit_end <= unit_begin (ERROR)\n");
+ #endif
+     offset_guess = -1;
+   } else {
+     offset_guess = guess (unit_at, unit_target, unit_begin, unit_end,
+ 			  offset_begin, offset_end);
+   }
+ 
++  if (offset_end != -1 && guess >= offset_end)
++    offset_guess = offset_begin + (offset_end - offset_begin)/2;
++
+ #ifdef DEBUG
+     printf ("oggz_seek_guess: guessed %" PRI_OGGZ_OFF_T "d\n", offset_guess);
+ #endif
+ 
+   return offset_guess;
+ }
+ 
+ static oggz_off_t
+@@ -759,16 +764,18 @@ oggz_seek_set (OGGZ * oggz, ogg_int64_t unit_target)
+     } else {
+       break;
+     }
+   }
+ 
+  found:
+   do {
+     offset_at = oggz_get_prev_start_page (oggz, og, &granule_at, &serialno);
++    if (offset_at == -1)
++      break;
+     unit_at = oggz_get_unit (oggz, serialno, granule_at);
+   } while (unit_at > unit_target);
+ 
+   if (offset_at < 0) {
+     oggz_reset (oggz, offset_orig, -1, SEEK_SET);
+     return -1;
+   }
+ 

--- a/media/liboggz/src/liboggz/oggz_seek.c
+++ b/media/liboggz/src/liboggz/oggz_seek.c
@@ -486,16 +486,18 @@ oggz_scan_for_page (OGGZ * oggz, ogg_pag
       serialno = ogg_page_serialno (og);
       granule_at = ogg_page_granulepos (og);
       unit_at = oggz_get_unit (oggz, serialno, granule_at);
 
       break;
 #else
       do {
         offset_at = oggz_get_prev_start_page(oggz, og, &granule_at, &serialno);
+        if (offset_at == -1)
+          return -1;
         unit_at = oggz_get_unit(oggz, serialno, granule_at);
       } while (unit_at > unit_target);
       return offset_at;
 #endif
     } else if (unit_at == unit_target) {
 #ifdef DEBUG
       printf (" scan: (%lld) == (%lld)\n", unit_at, unit_target);
 #endif
@@ -552,16 +554,19 @@ oggz_seek_guess (ogg_int64_t unit_at, og
     printf ("oggz_seek_guess: unit_end <= unit_begin (ERROR)\n");
 #endif
     offset_guess = -1;
   } else {
     offset_guess = guess (unit_at, unit_target, unit_begin, unit_end,
 			  offset_begin, offset_end);
   }
 
+  if (offset_end != -1 && guess >= offset_end)
+    offset_guess = offset_begin + (offset_end - offset_begin)/2;
+
 #ifdef DEBUG
     printf ("oggz_seek_guess: guessed %" PRI_OGGZ_OFF_T "d\n", offset_guess);
 #endif
 
   return offset_guess;
 }
 
 static oggz_off_t
@@ -759,16 +764,18 @@ oggz_seek_set (OGGZ * oggz, ogg_int64_t 
     } else {
       break;
     }
   }
 
  found:
   do {
     offset_at = oggz_get_prev_start_page (oggz, og, &granule_at, &serialno);
+    if (offset_at == -1)
+      break;
     unit_at = oggz_get_unit (oggz, serialno, granule_at);
   } while (unit_at > unit_target);
 
   if (offset_at < 0) {
     oggz_reset (oggz, offset_orig, -1, SEEK_SET);
     return -1;
   }
 

--- a/media/liboggz/update.sh
+++ b/media/liboggz/update.sh
@@ -36,8 +36,9 @@ cp $1/src/liboggz/oggz_stream_private.h 
 cp $1/src/liboggz/oggz_vector.h ./src/liboggz/oggz_vector.h
 cp $1/src/liboggz/oggz_auto.h ./src/liboggz/oggz_auto.h
 sed s/\#include\ \"config.h\"/\#ifdef\ WIN32\\n\#include\ \"config_win32.h\"\\n\#else\\n\#include\ \"config.h\"\\n\#endif/g $1/src/liboggz/oggz_io.c >./src/liboggz/oggz_io.c
 sed s/\#include\ \"config.h\"/\#ifdef\ WIN32\\n\#include\ \"config_win32.h\"\\n\#else\\n\#include\ \"config.h\"\\n\#endif/g $1/src/liboggz/oggz_vector.c >./src/liboggz/oggz_vector.c
 sed s/\#include\ \"config.h\"/\#ifdef\ WIN32\\n\#include\ \"config_win32.h\"\\n\#else\\n\#include\ \"config.h\"\\n\#endif/g $1/src/liboggz/oggz_seek.c >./src/liboggz/oggz_seek.c
 cp $1/src/liboggz/oggz_dlist.h ./src/liboggz/oggz_dlist.h
 sed s/\#include\ \"config.h\"/\#ifdef\ WIN32\\n\#include\ \"config_win32.h\"\\n\#else\\n\#include\ \"config.h\"\\n\#endif/g $1/src/liboggz/metric_internal.c >./src/liboggz/metric_internal.c
 cp $1/AUTHORS ./AUTHORS
+patch -p4 <seek.patch
\ No newline at end of file