diff --git a/doc/APIchanges b/doc/APIchanges
index a17922e11c1ee0700064f47a7bfb0bff25f8f945..e46ee48e360c4b9b20263fb7d4d23067c1ce63e0 100644
--- a/doc/APIchanges
+++ b/doc/APIchanges
@@ -13,6 +13,9 @@ libavutil:   2011-04-18
 
 API changes, most recent first:
 
+2011-05-07 - xxxxxxx - lavc 53.5.0 - AVFrame
+  Add format field to AVFrame.
+
 2011-05-07 - xxxxxxx - lavc 53.4.0 - AVFrame
   Add width and height fields to AVFrame.
 
diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index e26fcc212d4073e895647f32b985b6304907823a..acdb183f90ce321697ec6f91ec94d9cba248dee3 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -1025,6 +1025,15 @@ typedef struct AVPanScan{
      * - decoding: Read by user.\
      */\
     int width, height;\
+\
+    /**\
+     * format of the frame, -1 if unknown or unset\
+     * It should be cast to the corresponding enum (enum PixelFormat\
+     * for video, enum AVSampleFormat for audio)\
+     * - encoding: unused\
+     * - decoding: Read by user.\
+     */\
+    int format;\
 
 
 #define FF_QSCALE_TYPE_MPEG1 0
diff --git a/libavcodec/utils.c b/libavcodec/utils.c
index dc26092dd11497d7ab0aca94902d2ee446ad4cfd..5e0aa84ad0c66ed2087c1edf4e9bd4900ccf57ab 100644
--- a/libavcodec/utils.c
+++ b/libavcodec/utils.c
@@ -456,6 +456,7 @@ void avcodec_get_frame_defaults(AVFrame *pic){
     pic->pkt_pos = -1;
     pic->key_frame= 1;
     pic->sample_aspect_ratio = (AVRational){0, 1};
+    pic->format = -1;           /* unknown */
 }
 
 AVFrame *avcodec_alloc_frame(void){
@@ -743,6 +744,8 @@ int attribute_align_arg avcodec_decode_video2(AVCodecContext *avctx, AVFrame *pi
                 picture->width = avctx->width;
             if (!picture->height)
                 picture->height = avctx->height;
+            if (picture->format == PIX_FMT_NONE)
+                picture->format = avctx->pix_fmt;
         }
 
         emms_c(); //needed to avoid an emms_c() call before every return;
diff --git a/libavcodec/version.h b/libavcodec/version.h
index 362c4f1f2d27b61504dc49c841045f9485bbbdac..56d1eac52c7f855d2dfdc4d05e6c101d1b0b84c7 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  4
+#define LIBAVCODEC_VERSION_MINOR  5
 #define LIBAVCODEC_VERSION_MICRO  0
 
 #define LIBAVCODEC_VERSION_INT  AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
diff --git a/libavfilter/vsrc_buffer.c b/libavfilter/vsrc_buffer.c
index 84456718c489958df352693c0e074055f369fa28..b094e99209a105309adb85f7951f888fb494bb50 100644
--- a/libavfilter/vsrc_buffer.c
+++ b/libavfilter/vsrc_buffer.c
@@ -104,6 +104,7 @@ int av_vsrc_buffer_add_frame2(AVFilterContext *buffer_filter, AVFrame *frame,
     memcpy(c->frame.linesize, frame->linesize, sizeof(frame->linesize));
     c->frame.width  = frame->width;
     c->frame.height = frame->height;
+    c->frame.format = frame->format;
     c->frame.interlaced_frame= frame->interlaced_frame;
     c->frame.top_field_first = frame->top_field_first;
     c->frame.key_frame = frame->key_frame;