Merge commit '7751e4693dd10ec98c20fbd9887233b575034272'

* commit '7751e4693dd10ec98c20fbd9887233b575034272':
  ogg: check that the expected number of headers had been parsed
  libx264: change default to closed gop to match x264cli
  Use avcodec_free_frame() to free AVFrames.
  lavf: use a malloced AVFrame in try_decode_frame().
  lavc: add avcodec_free_frame().
  lavc: ensure extended_data is set properly on decoding
  lavc: initialize AVFrame.extended_data in avcodec_get_frame_defaults()
  lavc: use av_mallocz to allocate AVFrames.
  lavc: rename the argument of avcodec_alloc_frame/get_frame_defaults

Conflicts:
	doc/APIchanges
	doc/examples/decoding_encoding.c
	libavcodec/utils.c
	libavcodec/version.h
	libavfilter/src_movie.c
	libavformat/oggdec.c
	libavformat/oggdec.h
	libavformat/oggparsetheora.c
	libavformat/utils.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/libx264.c

@@ -694,6 +694,7 @@ static const AVCodecDefault x264_defaults[] = {
     { "cmp",              "-1" },
     { "threads",          AV_STRINGIFY(X264_THREADS_AUTO) },
     { "thread_type",      "0" },
+    { "flags",            "+cgop" },
     { NULL },
 };