API changes, most recent first:
+2016-xx-xx - xxxxxxx
+ Change av_sha_update() and av_md5_sum()/av_md5_update() length
+ parameter type to size_t at next major bump.
+
+2016-xx-xx - xxxxxxx - lavc 57.29.0 - avcodec.h
+ Add AV_PKT_DATA_SPHERICAL packet side data to export AVSphericalMapping
+ information from containers.
+
+2016-xx-xx - xxxxxxx - lavu 55.30.0 - spherical.h
+ Add AV_FRAME_DATA_SPHERICAL value, av_spherical_alloc() API and
+ AVSphericalMapping type to export and describe spherical video properties.
+
+2016-xx-xx - xxxxxxx - lavf 57.10.0 - avformat.h
+ Add av_stream_add_side_data().
+
+2016-xx-xx - xxxxxxx - lavu 55.28.0 - pixfmt.h
+ Add AV_PIX_FMT_GRAY12(LE/BE).
+
+2016-xx-xx - xxxxxxx - lavu 55.27.0 - hwcontext.h
+ Add av_hwframe_map() and associated AV_HWFRAME_MAP_* flags.
+ Add av_hwframe_ctx_create_derived().
+
+2016-xx-xx - xxxxxxx - lavu 55.25.0 - pixfmt.h
+ Add AV_PIX_FMT_GBRAP12(LE/BE).
+
+2016-xx-xx - xxxxxxx - lavu 55.24.0 - pixfmt.h
+ Add AV_PIX_FMT_GBRP12(LE/BE).
+
+2016-xx-xx - xxxxxxx - lavu 55.23.0 - hwcontext_vaapi.h
+ Add AV_VAAPI_DRIVER_QUIRK_ATTRIB_MEMTYPE.
+
+2016-xx-xx - xxxxxxx - lavf 57.08.0 - avio.h
+ Add AVIO_SEEKABLE_TIME flag.
+
+2016-xx-xx - xxxxxxx - lavu 55.22.0 - pixfmt.h
+ Add AV_PIX_FMT_YUV420P12, AV_PIX_FMT_YUV422P12, and AV_PIX_FMT_YUV444P12.
+
+2016-xx-xx - xxxxxxx - lavc 57.27.0 - avcodec.h
+ Add FF_PROFILE_HEVC_REXT, the extended pixel format profile for HEVC.
+
2016-08-24 - xxxxxxx - lavu 55.21.0 - imgutils.h
Add av_image_copy_uc_from(), a version of av_image_copy() for copying
from GPU mapped memory.
Deprecate struct vaapi_context and the vaapi.h installed header.
Callers should set AVCodecContext.hw_frames_ctx instead.
+------------------------------8<-------------------------------------
+ 12 branch was cut here
+----------------------------->8--------------------------------------
+
2016-07-20 - xxxxxxx - lavu 55.20.0 - cpu.h
Add AV_CPU_FLAG_SSSE3SLOW.