ffmpeg update to june 23 version which fixes mp4 crash on still frames with 3...

source/patched-ffmpeg-mt/libavutil/internal.h

 /*
  * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
@@ skipping 28 matching lines @@
 #include "timer.h"
 
 #ifndef attribute_align_arg
 #if (!defined(__ICC) || __ICC > 1110) && AV_GCC_VERSION_AT_LEAST(4,2)
 #    define attribute_align_arg __attribute__((force_align_arg_pointer))
 #else
 #    define attribute_align_arg
 #endif
 #endif
 
+
+/**
+ * Marks a variable as used and prevents the compiler from optimizing it away.
+ * This is usefull for asm that accesses varibles in ways that the compiler doesnt
+ * understand
+ */
 #ifndef attribute_used
 #if AV_GCC_VERSION_AT_LEAST(3,1)
 #    define attribute_used __attribute__((used))
 #else
 #    define attribute_used
 #endif
 #endif
 
 #ifndef INT16_MIN
 #define INT16_MIN       (-0x7fff - 1)
@@ skipping 130 matching lines @@
  * Returns NULL if CONFIG_SMALL is true, otherwise the argument
  * without modification. Used to disable the definition of strings
  * (for example AVCodec long_names).
  */
 #if CONFIG_SMALL
 #   define NULL_IF_CONFIG_SMALL(x) NULL
 #else
 #   define NULL_IF_CONFIG_SMALL(x) x
 #endif
 
+/**
+ * Create a non default alias for a function with specified version.
+ * This is needed when symbols are moved from a lib to a dependancy of the lib
+ * because the gnu linker as of 2010 is buggy and fails to dynamicaly link if a symbol
+ * is not found in the lib in which it was during link time with enabled versioning
+ * even if a correctly versioned and matching symbol exists in another lib and
+ * even if it did find that would it not contain an explicit check to fail
+ */
+#if HAVE_SYMVER_ASM_LABEL
+#   define FF_SYMVER(type, name, args, ver)                     \
+    type ff_##name args __asm__ (EXTERN_PREFIX #name "@" ver);  \
+    type ff_##name args
+#elif HAVE_SYMVER_GNU_ASM
+#   define FF_SYMVER(type, name, args, ver)                             \
+    __asm__ (".symver ff_" #name "," EXTERN_PREFIX #name "@" ver);      \
+    type ff_##name args;                                                \
+    type ff_##name args
+#endif
+
+/**
+ * Returns NULL if a threading library has not been enabled.
+ * Used to disable threading functions in AVCodec definitions
+ * when not needed.
+ */
 #if HAVE_THREADS
 #   define ONLY_IF_THREADS_ENABLED(x) x
 #else
 #   define ONLY_IF_THREADS_ENABLED(x) NULL
 #endif
 
 #endif /* AVUTIL_INTERNAL_H */