diff --git a/doc/APIchanges b/doc/APIchanges
index b97df1f1a7..74bceaae9a 100644
--- a/doc/APIchanges
+++ b/doc/APIchanges
@@ -13,6 +13,9 @@ libavutil:   2011-04-18
 
 API changes, most recent first:
 
+2011-09-18 - xxxxxxx - lavc 53.16.0
+  Add showall flag2
+
 2011-09-16 - xxxxxxx - lavfi 2.42.0
   Add avfilter_all_channel_layouts.
 
diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index f8f4f69ef6..8e771dd293 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -608,6 +608,7 @@ typedef struct RcOverride{
 #define CODEC_FLAG2_LOCAL_HEADER  0x00000008 ///< Place global headers at every keyframe instead of in extradata.
 #define CODEC_FLAG2_SKIP_RD       0x00004000 ///< RD optimal MB level residual skipping
 #define CODEC_FLAG2_CHUNKS        0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
+#define CODEC_FLAG2_SHOW_ALL      0x00400000 ///< Show all frames before the first keyframe
 /**
  * @defgroup deprecated_flags Deprecated codec flags
  * Use corresponding private codec options instead.
diff --git a/libavcodec/options.c b/libavcodec/options.c
index 549d04a76c..b78ffccdba 100644
--- a/libavcodec/options.c
+++ b/libavcodec/options.c
@@ -123,6 +123,7 @@ static const AVOption options[]={
 {"sgop", "strictly enforce gop size", 0, FF_OPT_TYPE_CONST, {.dbl = CODEC_FLAG2_STRICT_GOP }, INT_MIN, INT_MAX, V|E, "flags2"},
 {"noout", "skip bitstream encoding", 0, FF_OPT_TYPE_CONST, {.dbl = CODEC_FLAG2_NO_OUTPUT }, INT_MIN, INT_MAX, V|E, "flags2"},
 {"local_header", "place global headers at every keyframe instead of in extradata", 0, FF_OPT_TYPE_CONST, {.dbl = CODEC_FLAG2_LOCAL_HEADER }, INT_MIN, INT_MAX, V|E, "flags2"},
+{"showall", "Show all frames before the first keyframe", 0, FF_OPT_TYPE_CONST, {.dbl = CODEC_FLAG2_SHOW_ALL }, INT_MIN, INT_MAX, V|D, "flags2"},
 {"sub_id", NULL, OFFSET(sub_id), FF_OPT_TYPE_INT, {.dbl = DEFAULT }, INT_MIN, INT_MAX},
 {"me_method", "set motion estimation method", OFFSET(me_method), FF_OPT_TYPE_INT, {.dbl = ME_EPZS }, INT_MIN, INT_MAX, V|E, "me_method"},
 {"zero", "zero motion estimation (fastest)", 0, FF_OPT_TYPE_CONST, {.dbl = ME_ZERO }, INT_MIN, INT_MAX, V|E, "me_method" },
diff --git a/libavcodec/version.h b/libavcodec/version.h
index b9e44e0686..bca20f6ad1 100644
--- a/libavcodec/version.h
+++ b/libavcodec/version.h
@@ -21,7 +21,7 @@
 #define AVCODEC_VERSION_H
 
 #define LIBAVCODEC_VERSION_MAJOR 53
-#define LIBAVCODEC_VERSION_MINOR 15
+#define LIBAVCODEC_VERSION_MINOR 16
 #define LIBAVCODEC_VERSION_MICRO  0
 
 #define LIBAVCODEC_VERSION_INT  AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \