API changes, most recent first:
+2021-03-10 - xxxxxxxxxx - lavu 56.68.100 - buffer.h
+ Change AVBufferRef related function and struct size parameter and fields
+ type to size_t at next major bump.
+
+2021-03-04 - xxxxxxxxxx - lavc 58.128.101 - avcodec.h
+ Enable err_recognition to be set for encoders.
+
+2021-03-03 - xxxxxxxxxx - lavf 58.70.100 - avformat.h
+ Deprecate AVFMT_FLAG_PRIV_OPT. It will do nothing
+ as soon as av_demuxer_open() is removed.
+
+2021-02-27 - xxxxxxxxxx - lavc 58.126.100 - avcodec.h
+ Deprecated avcodec_get_frame_class().
+
+2021-02-21 - xxxxxxxxxx - lavu 56.66.100 - tx.h
+ Add enum AVTXFlags and AVTXFlags.AV_TX_INPLACE
+
+2021-02-14 - xxxxxxxxxx - lavd 58.12.100 - avdevice.h
+ Deprecated avdevice_capabilities_create() and
+ avdevice_capabilities_free().
+
+2021-02-xx - xxxxxxxxxx - lavu 56.xx.100 - common.h
+ Add FFABS64U()
+
+2021-01-26 - xxxxxxxxxx - lavu 56.64.100 - common.h
+ Add FFABSU()
+
+2021-01-25 - xxxxxxxxxx - lavc 58.119.100 - avcodec.h
+ Deprecate AVCodecContext.debug_mv, FF_DEBUG_VIS_MV_P_FOR, FF_DEBUG_VIS_MV_B_FOR,
+ FF_DEBUG_VIS_MV_B_BACK
+
+2021-01-11 - xxxxxxxxxx - lavc 58.116.100 - avcodec.h
+ Add FF_PROFILE_VVC_MAIN_10 and FF_PROFILE_VVC_MAIN_10_444.
+
+2020-xx-xx - xxxxxxxxxx - lavu 56.63.100 - video_enc_params.h
+ Add AV_VIDEO_ENC_PARAMS_MPEG2
+
+2020-12-03 - xxxxxxxxxx - lavu 56.62.100 - timecode.h
+ Add av_timecode_init_from_components.
+
+2020-xx-xx - xxxxxxxxxx - lavc 58.114.100 - avcodec.h
+ Deprecate AVCodecContext.thread_safe_callbacks. Starting with
+ LIBAVCODEC_VERSION_MAJOR=60, user callbacks must always be
+ thread-safe when frame threading is used.
+
+2020-11-25 - xxxxxxxxxx - lavc 58.113.100 - avcodec.h
+ Adds a new flag AV_CODEC_EXPORT_DATA_FILM_GRAIN for export_side_data.
+
+2020-11-25 - xxxxxxxxxx - lavu 56.61.100 - film_grain_params.h
+ Adds a new API for extracting codec film grain parameters as side data.
+ Adds a new AVFrameSideDataType entry AV_FRAME_DATA_FILM_GRAIN_PARAMS for it.
+
+2020-xx-xx - xxxxxxxxxx - lavf 58.64.100 - avformat.h
+ Add AVSTREAM_EVENT_FLAG_NEW_PACKETS.
+
+2020-xx-xx - xxxxxxxxxx - lavu 56.60.100 - buffer.h
+ Add a av_buffer_replace() convenience function.
+
2020-09-xx - xxxxxxxxxx - lavu 56.59.100 - timecode.h
Add av_timecode_make_smpte_tc_string2.
Add av_opt_child_class_iterate() and AVClass.child_class_iterate().
Deprecate av_opt_child_class_next() and AVClass.child_class_next().
+-------- 8< --------- FFmpeg 4.3 was cut here -------- 8< ---------
+
2020-06-05 - ec39c2276a - lavu 56.50.100 - buffer.h
Passing NULL as alloc argument to av_buffer_pool_init2() is now allowed.