APIchanges

Never assume the API of libav* to be stable unless at least 1 month has passed
since the last major version increase or the API was added.

The last version increases were:
libavcodec:    2013-03-xx
libavdevice:   2013-03-xx
libavfilter:   2013-12-xx
libavformat:   2013-03-xx
libavresample: 2012-10-05
libpostproc:   2011-04-18
libswresample: 2011-09-19
libswscale:    2011-06-20
libavutil:     2012-10-22


API changes, most recent first:

2014-03-11 - 3f3229c - lavf 55.34.101 - avformat.h
  Set AVFormatContext.start_time_realtime when demuxing.

2014-xx-xx - xxxxxx - lavd 55.11.100 - avdevice.h
  Add av_input_audio_device_next().
  Add av_input_video_device_next().
  Add av_output_audio_device_next().
  Add av_output_video_device_next().

2014-02-24 - fff5262 / 1155fd0 - lavu 52.66.100 / 53.5.0 - frame.h
  Add av_frame_copy() for copying the frame data.

2014-02-24 - a66be60 - lswr 0.18.100 - swresample.h
  Add swr_is_initialized() for checking whether a resample context is initialized.

2014-02-22 - 5367c0b / 7e86c27 - lavr 1.2.0 - avresample.h
  Add avresample_is_open() for checking whether a resample context is open.

2014-02-19 - 6a24d77 / c3ecd96 - lavu 52.65.100 / 53.4.0  - opt.h
  Add AV_OPT_FLAG_EXPORT and AV_OPT_FLAG_READONLY to mark options meant (only)
  for reading.

2014-02-19 - f4c8d00 / 6bb8720 - lavu 52.64.101 / 53.3.1 - opt.h
  Deprecate unused AV_OPT_FLAG_METADATA.

2014-02-xx - xxxxxxx - lavd 55.10.100 - avdevice.h
  Add avdevice_list_devices() and avdevice_free_list_devices()

2014-02-16 - db3c970 - lavf 55.33.100 - avio.h
  Add avio_find_protocol_name() to find out the name of the protocol that would
  be selected for a given URL.

2014-02-15 - a2bc6c1 / c98f316 - lavu 52.64.100 / 53.3.0 - frame.h
  Add AV_FRAME_DATA_DOWNMIX_INFO value to the AVFrameSideDataType enum and
  downmix_info.h API, which identify downmix-related metadata.

2014-02-11 - 1b05ac2 - lavf 55.32.100 - avformat.h
  Add av_write_uncoded_frame() and av_interleaved_write_uncoded_frame().

2014-02-04 - 3adb5f8 / d9ae103 - lavf 55.30.100 / 55.11.0 - avformat.h
  Add AVFormatContext.max_interleave_delta for controlling amount of buffering
  when interleaving.

2014-02-02 - 5871ee5 - lavf 55.29.100 - avformat.h
  Add output_ts_offset muxing option to AVFormatContext.

2014-01-27 - 102bd64 - lavd 55.7.100 - avdevice.h
                       lavf 55.28.100 - avformat.h
  Add avdevice_dev_to_app_control_message() function.

2014-01-27 - 7151411 - lavd 55.6.100 - avdevice.h
                       lavf 55.27.100 - avformat.h
  Add avdevice_app_to_dev_control_message() function.

2014-01-24 - 86bee79 - lavf 55.26.100 - avformat.h
  Add AVFormatContext option metadata_header_padding to allow control over the
  amount of padding added.

2014-01-20 - eef74b2 / 93c553c - lavc 55.48.102 / 55.32.1 - avcodec.h
  Edges are not required anymore on video buffers allocated by get_buffer2()
  (i.e. as if the CODEC_FLAG_EMU_EDGE flag was always on). Deprecate
  CODEC_FLAG_EMU_EDGE and avcodec_get_edge_width().

2014-01-19 - 1a193c4 - lavf 55.25.100 - avformat.h
  Add avformat_get_mov_video_tags() and avformat_get_mov_audio_tags().

2014-01-19 - xxxxxxx - lavu 52.63.100 - rational.h
  Add av_make_q() function.

2014-01-05 - 4cf4da9 / 5b4797a - lavu 52.62.100 / 53.2.0 - frame.h
  Add AV_FRAME_DATA_MATRIXENCODING value to the AVFrameSideDataType enum, which
  identifies AVMatrixEncoding data.

2014-01-05 - 751385f / 5c437fb - lavu 52.61.100 / 53.1.0 - channel_layout.h
  Add values for various Dolby flags to the AVMatrixEncoding enum.

2014-01-04 - b317f94 - lavu 52.60.100 - mathematics.h
  Add av_add_stable() function.

2013-12-22 - 911676c - lavu 52.59.100 - avstring.h
  Add av_strnlen() function.

2013-12-09 - 64f73ac - lavu 52.57.100 - opencl.h
  Add av_opencl_benchmark() function.

2013-11-30 - 82b2e9c - lavu 52.56.100 - ffversion.h
  Moves version.h to libavutil/ffversion.h.
  Install ffversion.h and make it public.

2013-12-11 - 29c83d2 / b9fb59d,409a143 / 9431356,44967ab / d7b3ee9 - lavc 55.45.101 / 55.28.1 - avcodec.h
  av_frame_alloc(), av_frame_unref() and av_frame_free() now can and should be
  used instead of avcodec_alloc_frame(), avcodec_get_frame_defaults() and
  avcodec_free_frame() respectively. The latter three functions are deprecated.

2013-12-09 - 7a60348 / 7e244c6- - lavu 52.58.100 / 52.20.0 - frame.h
  Add AV_FRAME_DATA_STEREO3D value to the AVFrameSideDataType enum and
  stereo3d.h API, that identify codec-independent stereo3d information.

2013-11-26 - 625b290 / 1eaac1d- - lavu 52.55.100 / 52.19.0 - frame.h
  Add AV_FRAME_DATA_A53_CC value to the AVFrameSideDataType enum, which
  identifies ATSC A53 Part 4 Closed Captions data.

2013-11-22 - 6859065 - lavu 52.54.100 - avstring.h
  Add av_utf8_decode() function.

2013-11-22 - fb7d70c - lavc 55.44.100 - avcodec.h
  Add HEVC profiles

2013-11-20 - c28b61c - lavc 55.44.100 - avcodec.h
  Add av_packet_{un,}pack_dictionary()
  Add AV_PKT_METADATA_UPDATE side data type, used to transmit key/value
  strings between a stream and the application.

2013-11-14 - 7c888ae / cce3e0a - lavu 52.53.100 / 52.18.0 - mem.h
  Move av_fast_malloc() and av_fast_realloc() for libavcodec to libavutil.

2013-11-14 - b71e4d8 / 8941971 - lavc 55.43.100 / 55.27.0 - avcodec.h
  Deprecate AVCodecContext.error_rate, it is replaced by the 'error_rate'
  private option of the mpegvideo encoder family.

2013-11-14 - 31c09b7 / 728c465 - lavc 55.42.100 / 55.26.0 - vdpau.h
  Add av_vdpau_get_profile().
  Add av_vdpau_alloc_context(). This function must from now on be
  used for allocating AVVDPAUContext.

2013-11-04 - be41f21 / cd8f772 - lavc 55.41.100 / 55.25.0 - avcodec.h
                       lavu 52.51.100 - frame.h
  Add ITU-R BT.2020 and other not yet included values to color primaries,
  transfer characteristics and colorspaces.

2013-11-04 - 85cabf1 - lavu 52.50.100 - avutil.h
  Add av_fopen_utf8()

2013-10-31 - 78265fc / 28096e0 - lavu 52.49.100 / 52.17.0 - frame.h
  Add AVFrame.flags and AV_FRAME_FLAG_CORRUPT.

2013-10-27 - dbe6f9f - lavc 55.39.100 - avcodec.h
  Add CODEC_CAP_DELAY support to avcodec_decode_subtitle2.

2013-10-27 - d61617a - lavu 52.48.100 - parseutils.h
  Add av_get_known_color_name().

2013-10-17 - 8696e51 - lavu 52.47.100 - opt.h
  Add AV_OPT_TYPE_CHANNEL_LAYOUT and channel layout option handlers
  av_opt_get_channel_layout() and av_opt_set_channel_layout().

2013-10-06 - ccf96f8 -libswscale 2.5.101 - options.c
  Change default scaler to bicubic

2013-10-03 - e57dba0 - lavc 55.34.100 - avcodec.h
  Add av_codec_get_max_lowres()

2013-10-02 - 5082fcc - lavf 55.19.100 - avformat.h
  Add audio/video/subtitle AVCodec fields to AVFormatContext to force specific
  decoders

2013-09-28 - 7381d31 / 0767bfd - lavfi 3.88.100 / 3.11.0 - avfilter.h
  Add AVFilterGraph.execute and AVFilterGraph.opaque for custom slice threading
  implementations.

2013-09-21 - 85f8a3c / e208e6d - lavu 52.46.100 / 52.16.0 - pixfmt.h
  Add interleaved 4:2:2 8/10-bit formats AV_PIX_FMT_NV16 and
  AV_PIX_FMT_NV20.

2013-09-16 - c74c3fb / 3feb3d6 - lavu 52.44.100 / 52.15.0 - mem.h
  Add av_reallocp.

2013-09-04 - 3e1f507 - lavc 55.31.101 - avcodec.h
  avcodec_close() argument can be NULL.

2013-09-04 - 36cd017 - lavf 55.16.101 - avformat.h
  avformat_close_input() argument can be NULL and point on NULL.

2013-08-29 - e31db62 - lavf 55.15.100 - avformat.h
  Add av_format_get_probe_score().

2013-08-15 - 1e0e193 - lsws 2.5.100 -
  Add a sws_dither AVOption, allowing to set the dither algorithm used

2013-08-11 - d404fe35 - lavc 55.27.100 - vdpau.h
  Add a render2 alternative to the render callback function.

2013-08-11 - af05edc - lavc 55.26.100 - vdpau.h