Never assume the API of libav* to be stable unless at least 1 month has passedsince the last major version increase or the API was added. The last version increases were:libavcodec:    2013-03-xxlibavdevice:   2013-03-xxlibavfilter:   2013-12-xxlibavformat:   2013-03-xxlibavresample: 2012-10-05libpostproc:   2011-04-18libswresample: 2011-09-19libswscale:    2011-06-20libavutil:     2012-10-22  API changes, most recent first: 2014-06-20 - 0dceefc / 9e500ef - lavu 52.90.100 / 53.17.0 - imgutils.h  Add av_image_check_sar(). 2014-06-20 - 4a99333 / 874390e - lavc 55.68.100 / 55.55.0 - avcodec.h  Add av_packet_rescale_ts() to simplify timestamp conversion. 2014-06-18 - ac293b6 / 194be1f - lavf 55.44.100 / 55.20.0 - avformat.h  The proper way for providing a hint about the desired timebase to the muxers  is now setting AVStream.time_base, instead of AVStream.codec.time_base as was  done previously. The old method is now deprecated. 2014-06-10 - xxxxxxx - lavf 55.43.100 - avformat.h  New field int64_t max_analyze_duration2 instead of deprecated  int max_analyze_duration. 2014-05-30 - 00759d7 - lavu 52.89.100 - opt.h  Add av_opt_copy() 2014-04-xx - 03bb99a / 0957b27 - lavc 55.66.100 / 55.54.0 - avcodec.h  Add AVCodecContext.side_data_only_packets to allow encoders to output packets  with only side data. This option may become mandatory in the future, so all  users are recommended to update their code and enable this option. 2014-06-01 - 6e8e9f1 / 8c02adc - lavu 52.88.100 / 53.16.0 - frame.h, pixfmt.h  Move all color-related enums (AVColorPrimaries, AVColorSpace, AVColorRange,  AVColorTransferCharacteristic, and AVChromaLocation) inside lavu.  And add AVFrame fields for them. 2014-04-xx - bdb2e80 / b2d4565 - lavr 1.3.0 - avresample.h  Add avresample_max_output_samples 2014-05-24 - d858ee7 / 6d21259 - lavf 55.42.100 / 55.19.0 - avformat.h  Add strict_std_compliance and related AVOptions to support experimental  muxing. 2014-05-26 - xxxxxxx - lavu 52.87.100 - threadmessage.h  Add thread message queue API. 2014-05-26 - c37d179 - lavf 55.41.100 - avformat.h  Add format_probesize to AVFormatContext. 2014-05-19 - 7d25af1 / c23c96b - lavf 55.39.100 / 55.18.0 - avformat.h  Add av_stream_get_side_data() to access stream-level side data  in the same way as av_packet_get_side_data(). 2014-05-xx - xxxxxxx - lavu 52.86.100 - fifo.h  Add av_fifo_alloc_array() function. 2014-05-19 - ef1d4ee / bddd8cb - lavu 52.85.100 / 53.15.0 - frame.h, display.h  Add AV_FRAME_DATA_DISPLAYMATRIX for exporting frame-level  spatial rendering on video frames for proper display. 2014-05-xx - xxxxxxx - lavc 55.64.100 / 55.53.0 - avcodec.h  Add AV_PKT_DATA_DISPLAYMATRIX for exporting packet-level  spatial rendering on video frames for proper display. 2014-05-19 - 999a99c / a312f71 - lavf 55.38.101 / 55.17.1 - avformat.h  Deprecate AVStream.pts and the AVFrac struct, which was its only use case.  See use av_stream_get_end_pts() 2014-05-18 - 68c0518 / fd05602 - lavc 55.63.100 / 55.52.0 - avcodec.h  Add avcodec_free_context(). From now on it should be used for freeing  AVCodecContext. 2014-05-17 - 0eec06e - lavu 52.84.100 - time.h  Add av_gettime_relative() av_gettime_relative_is_monotonic() 2014-05-15 - eacf7d6 / 0c1959b - lavf 55.38.100 / 55.17.0 - avformat.h  Add AVMFT_FLAG_BITEXACT flag. Muxers now use it instead of checking  CODEC_FLAG_BITEXACT on the first stream. 2014-05-15 - 96cb4c8 - lswr 0.19.100 - swresample.h  Add swr_close() 2014-05-11 - 14aef38 / 66e6c8a - lavu 52.83.100 / 53.14.0 - pixfmt.h  Add AV_PIX_FMT_VDA for new-style VDA acceleration. 2014-05-xx - xxxxxxx - lavu 52.82.0 - fifo.h  Add av_fifo_freep() function. 2014-05-02 - ba52fb11 - lavu 52.81.0 - opt.h  Add av_opt_set_dict2() function. 2014-05-01 - e77b985 / a2941c8 - lavc 55.60.103 / 55.50.3 - avcodec.h  Deprecate CODEC_FLAG_MV0. It is replaced by the flag "mv0" in the  "mpv_flags" private option of the mpegvideo encoders. 2014-05-01 - e40ae8c / 6484149 - lavc 55.60.102 / 55.50.2 - avcodec.h  Deprecate CODEC_FLAG_GMC. It is replaced by the "gmc" private option of the  libxvid encoder. 2014-05-01 - 1851643 / b2c3171 - lavc 55.60.101 / 55.50.1 - avcodec.h  Deprecate CODEC_FLAG_NORMALIZE_AQP. It is replaced by the flag "naq" in the  "mpv_flags" private option of the mpegvideo encoders. 2014-05-01 - cac07d0 / 5fcceda - avcodec.h  Deprecate CODEC_FLAG_INPUT_PRESERVED. Its functionality is replaced by passing  reference-counted frames to encoders. 2014-04-29 - 1bf6396 - lavc 55.60.100 - avcodec.h  Add AVCodecDescriptor.mime_types field. 2014-04-29 - xxxxxxx - lavu 52.80.0 - hash.h  Add av_hash_final_bin(), av_hash_final_hex() and av_hash_final_b64(). 2014-03-07 - 8b2a130 - lavc 55.50.0 / 55.53.100 - dxva2.h  Add FF_DXVA2_WORKAROUND_INTEL_CLEARVIDEO for old Intel GPUs. 2014-04-22 - 502512e /dac7e8a - lavu 53.13.0 / 52.78.100 - avutil.h  Add av_get_time_base_q(). 2014-04-17 - a8d01a7 / 0983d48 - lavu 53.12.0 / 52.77.100 - crc.h  Add AV_CRC_16_ANSI_LE crc variant. 2014-04-XX - xxxxxxx - lavf xx.xx.1xx - avformat.h  Add av_format_inject_global_side_data() 2014-04-12 - 4f698be - lavu 52.76.100 - log.h  Add av_log_get_flags() 2014-04-11 - 6db42a2b - lavd 55.12.100 - avdevice.h  Add avdevice_capabilities_create() function.  Add avdevice_capabilities_free() function. 2014-04-07 - 0a1cc04 / 8b17243 - lavu 52.75.100 / 53.11.0 - pixfmt.h  Add AV_PIX_FMT_YVYU422 pixel format. 2014-04-04 - c1d0536 / 8542f9c - lavu 52.74.100 / 53.10.0 - replaygain.h  Full scale for peak values is now 100000 (instead of UINT32_MAX) and values  may overflow. 2014-04-03 - c16e006 / 7763118 - lavu 52.73.100 / 53.9.0 - log.h  Add AV_LOG(c) macro to have 256 color debug messages. 2014-04-03 - eaed4da9 - lavu 52.72.100 - opt.h  Add AV_OPT_MULTI_COMPONENT_RANGE define to allow return  multi-component option ranges. 2014-03-29 - cd50a44b - lavu 52.70.100 - mem.h  Add av_dynarray_add_nofree() function. 2014-02-24 - 3e1f241 / d161ae0 - lavu 52.69.100 / 53.8.0 - frame.h  Add av_frame_remove_side_data() for removing a single side data  instance from a frame. 2014-03-24 - 83e8978 / 5a7e35d - lavu 52.68.100 / 53.7.0 - frame.h, replaygain.h  Add AV_FRAME_DATA_REPLAYGAIN for exporting replaygain tags.  Add a new header replaygain.h with the AVReplayGain struct. 2014-03-24 - 83e8978 / 5a7e35d - lavc 55.54.100 / 55.36.0 - avcodec.h  Add AV_PKT_DATA_REPLAYGAIN for exporting replaygain tags. 2014-03-24 - 595ba3b / 25b3258 - lavf 55.35.100 / 55.13.0 - avformat.h  Add AVStream.side_data and AVStream.nb_side_data for exporting stream-global  side data (e.g. replaygain tags, video rotation) 2014-03-24 - bd34e26 / 0e2c3ee - lavc 55.53.100 / 55.35.0 - avcodec.h  Give the name AVPacketSideData to the previously anonymous struct used for  AVPacket.side_data. 2014-03-18 - 37c07d4 - lsws 2.5.102  Make gray16 full-scale. 2014-03-16 - 6b1ca17 / 1481d24 - lavu 52.67.100 / 53.6.0 - pixfmt.h  Add RGBA64_LIBAV pixel format and variants for compatibility 2014-03-11 - 3f3229c - lavf 55.34.101 - avformat.h  Set AVFormatContext.start_time_realtime when demuxing. 2014-03-03 - 06fed440 - 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  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 bitstream 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 - af5f9c0 / 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. 

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