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:   2012-06-22
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:

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

2013-10-17 - xxxxxxx - 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-xx - xxxxxxx -libswscale 2.5.101 - options.c
  Change default scaler to bicubic

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

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

2013-08-xx - xxxxxxx - lavfi 3.11.0 - avfilter.h
  Add AVFilterGraph.execute and AVFilterGraph.opaque for custom slice threading
  implementations.

2013-09-21 - xxxxxxx - lavu 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-xx - xxxxxxx - lavc 55.27.100 - vdpau.h
  Add a render2 alternative to the render callback function.

2013-08-xx - xxxxxxx - lavc 55.26.100 - vdpau.h
  Add allocation function for AVVDPAUContext, allowing
  to extend it in the future without breaking ABI/API.

2013-08-10 - 67a580f / 5a9a9d4 - lavc 55.25.100 / 55.16.0 - avcodec.h
  Extend AVPacket API with av_packet_unref, av_packet_ref,
  av_packet_move_ref, av_packet_copy_props, av_packet_free_side_data.

2013-08-05 - 9547e3e / f824535 - lavc 55.22.100 / 55.13.0 - avcodec.h
  Deprecate the bitstream-related members from struct AVVDPAUContext.
  The bistream buffers no longer need to be explicitly freed.

2013-08-05 - 3b805dc / 549294f - lavc 55.21.100 / 55.12.0 - avcodec.h
  Deprecate the CODEC_CAP_HWACCEL_VDPAU codec capability. Use CODEC_CAP_HWACCEL
  and select the AV_PIX_FMT_VDPAU format with get_format() instead.

2013-08-05 - 4ee0984 / a0ad5d0 - lavu 52.41.100 / 52.14.0 - pixfmt.h
  Deprecate AV_PIX_FMT_VDPAU_*. Use AV_PIX_FMT_VDPAU instead.

2013-08-02 - 82fdfe8 / a8b1927 - lavc 55.20.100 / 55.11.0 - avcodec.h
  Add output_picture_number to AVCodecParserContext.

2013-07-23 - abc8110 - lavc 55.19.100 - avcodec.h
  Add avcodec_chroma_pos_to_enum()
  Add avcodec_enum_to_chroma_pos()

2013-07-03 - 838bd73 - lavfi 3.78.100 - avfilter.h
  Deprecate avfilter_graph_parse() in favor of the equivalent
  avfilter_graph_parse_ptr().

2013-06-24 - af5f9c0 / 95d5246 - lavc 55.17.100 / 55.10.0 - avcodec.h
  Add MPEG-2 AAC profiles

2013-06-25 - 95d5246 - lavf 55.10.100 - avformat.h
  Add AV_DISPOSITION_* flags to indicate text track kind.

2013-06-15 - 99b8cd0 - lavu 52.36.100
  Add AVRIPEMD:
   av_ripemd_alloc()
   av_ripemd_init()
   av_ripemd_update()
   av_ripemd_final()

2013-06-04 - 30b491f / fc962d4 - lavu 52.35.100 / 52.13.0 - mem.h
  Add av_realloc_array and av_reallocp_array

2013-05-30 - 682b227 - lavu 52.35.100
  Add AVSHA512:
   av_sha512_alloc()
   av_sha512_init()
   av_sha512_update()
   av_sha512_final()

2013-05-24 - 8d4e969 / 129bb23 - lavfi 3.10.0 / 3.70.100 - avfilter.h
  Add support for slice multithreading to lavfi. Filters supporting threading
  are marked with AVFILTER_FLAG_SLICE_THREADS.
  New fields AVFilterContext.thread_type, AVFilterGraph.thread_type and
  AVFilterGraph.nb_threads (accessible directly or through AVOptions) may be
  used to configure multithreading.

2013-05-24 - fe40a9f / 2a6eaea - lavu 52.12.0 / 52.34.100 - cpu.h
  Add av_cpu_count() function for getting the number of logical CPUs.

2013-05-24 - 0c25c39 / b493847 - lavc 55.7.0 / 55.12.100 - avcodec.h
  Add picture_structure to AVCodecParserContext.

2013-05-17 - 3a751ea - lavu 52.33.100 - opt.h
  Add AV_OPT_TYPE_COLOR value to AVOptionType enum.

2013-05-13 - e398416 - lavu 52.31.100 - mem.h
  Add av_dynarray2_add().

2013-05-12 - 1776177 - lavfi 3.65.100
  Add AVFILTER_FLAG_SUPPORT_TIMELINE* filter flags.

2013-04-19 - 380cfce - lavc 55.4.100
  Add AV_CODEC_PROP_TEXT_SUB property for text based subtitles codec.

2013-04-18 - 7c1a002 - lavf 55.3.100
  The matroska demuxer can now output proper verbatim ASS packets. It will
  become the default starting lavf 56.0.100.

2013-04-10 - af0d270 - lavu 25.26.100 - avutil.h,opt.h
  Add av_int_list_length()
  and av_opt_set_int_list().

2013-03-30 - 5c73645 - lavu 52.24.100 - samplefmt.h
  Add av_samples_alloc_array_and_samples().

2013-03-29 - ef7b6b4 - lavf 55.1.100 - avformat.h
  Add av_guess_frame_rate()

2013-03-20 - 8d928a9 - lavu 52.22.100 - opt.h
  Add AV_OPT_TYPE_DURATION value to AVOptionType enum.

2013-03-17 - 7aa9af5 - lavu 52.20.100 - opt.h
  Add AV_OPT_TYPE_VIDEO_RATE value to AVOptionType enum.

2013-03-07 - 9767ec6 - lavu 52.18.100 - avstring.h,bprint.h
  Add av_escape() and av_bprint_escape() API.

2013-02-24 - b59cd08 - lavfi 3.41.100 - buffersink.h
  Add sample_rates field to AVABufferSinkParams.

2013-01-17 - a1a707f - lavf 54.61.100
  Add av_codec_get_tag2().

2013-01-01 - 2eb2e17 - lavfi 3.34.100
  Add avfilter_get_audio_buffer_ref_from_arrays_channels.

2012-12-20 - 34de47aa - lavfi 3.29.100 - avfilter.h
  Add AVFilterLink.channels, avfilter_link_get_channels()
  and avfilter_ref_get_channels().

2012-12-15 - 96d815fc - lavc 54.80.100 - avcodec.h
  Add pkt_size field to AVFrame.

2012-11-25 - c70ec631 - lavu 52.9.100 - opt.h
  Add the following convenience functions to opt.h:
   av_opt_get_image_size
   av_opt_get_pixel_fmt
   av_opt_get_sample_fmt
   av_opt_set_image_size
   av_opt_set_pixel_fmt
   av_opt_set_sample_fmt

2012-11-17 - 4cd74c81 - lavu 52.8.100 - bprint.h
  Add av_bprint_strftime().

2012-11-15 - 92648107 - lavu 52.7.100 - opt.h
  Add av_opt_get_key_value().

2012-11-13 - 79456652 - lavfi 3.23.100 - avfilter.h
  Add channels field to AVFilterBufferRefAudioProps.

2012-11-03 - 481fdeee - lavu 52.3.100 - opt.h
  Add AV_OPT_TYPE_SAMPLE_FMT value to AVOptionType enum.

2012-10-21 - 6fb2fd8 - lavc  54.68.100 - avcodec.h
                       lavfi  3.20.100 - avfilter.h