API changes, most recent first:
+-------- 8< --------- FFmpeg 4.1 was cut here -------- 8< ---------
+
+2018-10-27 - 718044dc19 - lavu 56.21.100 - pixdesc.h
+ Add av_read_image_line2(), av_write_image_line2()
+
+2018-10-24 - f9d4126f28 - lavu 56.20.100 - frame.h
+ Add AV_FRAME_DATA_S12M_TIMECODE
+
+2018-10-11 - f6d48b618a - lavc 58.33.100 - mediacodec.h
+ Add av_mediacodec_render_buffer_at_time().
+
+2018-09-09 - 35498c124a - lavc 58.29.100 - avcodec.h
+ Add AV_PKT_DATA_AFD
+
+2018-08-16 - b33f5299a5 - lavc 58.23.100 - avcodec.h
+ Add av_bsf_flush().
+
+2018-05-18 - 2b2f2f65f3 - lavf 58.15.100 - avformat.h
+ Add pmt_version field to AVProgram
+
+2018-05-17 - 5dfeb7f081 - lavf 58.14.100 - avformat.h
+ Add AV_DISPOSITION_STILL_IMAGE
+
+2018-05-10 - c855683427 - lavu 56.18.101 - hwcontext_cuda.h
+ Add AVCUDADeviceContext.stream.
+
+2018-04-30 - 56b081da57 - lavu 56.18.100 - pixdesc.h
+ Add AV_PIX_FMT_FLAG_ALPHA to AV_PIX_FMT_PAL8.
+
+2018-04-26 - 5be0410cb3 - lavu 56.17.100 - opt.h
+ Add AV_OPT_FLAG_DEPRECATED.
+
+2018-04-26 - 71fa82bed6 - lavu 56.16.100 - threadmessage.h
+ Add av_thread_message_queue_nb_elems().
+
+-------- 8< --------- FFmpeg 4.0 was cut here -------- 8< ---------
+
2018-04-03 - d6fc031caf - lavu 56.13.100 - pixdesc.h
Deprecate AV_PIX_FMT_FLAG_PSEUDOPAL and make allocating a pseudo palette
optional for API users (see AV_PIX_FMT_FLAG_PSEUDOPAL doxygen for details).
Add av_opt_get_dict_val/set_dict_val with AV_OPT_TYPE_DICT to support
dictionary types being set as options.
-2014-08-13 - afbd4b8 - lavf 56.01.0 - avformat.h
+2014-08-13 - afbd4b7e09 - lavf 56.01.0 - avformat.h
Add AVFormatContext.event_flags and AVStream.event_flags for signaling to
the user when events happen in the file/stream.
2014-08-08 - 5c3c671 - lavf 55.53.100 - avio.h
Add avio_feof() and deprecate url_feof().
-2014-08-07 - bb78903 - lsws 2.1.3 - swscale.h
+2014-08-07 - bb789016d4 - lsws 2.1.3 - swscale.h
sws_getContext is not going to be removed in the future.
2014-08-07 - a561662 / ad1ee5f - lavc 55.73.101 / 55.57.3 - avcodec.h