Never assume the API of libav* to be stable unless at least 1 week has passed sincethe last major version increase.The last version increases were:libavcodec:  ?libavdevice: ?libavfilter: 2009-10-18libavformat: ?libpostproc: ?libswscale:  ?libavutil:   2009-03-08  API changes, most recent first: 2011-03-02 - 863c471 - lavf  52.103.0 - av_pkt_dump2, av_pkt_dump_log2  Add new functions av_pkt_dump2, av_pkt_dump_log2 that uses the  source stream timebase for outputting timestamps. Deprecate  av_pkt_dump and av_pkt_dump_log. 2011-02-20 - e731b8d - lavf  52.102.0 - avio.h  * e731b8d - rename init_put_byte() to ffio_init_context(), deprecating the              original, and move it to a private header so it is no longer              part of our public API. Instead, use av_alloc_put_byte().  * ae628ec - rename ByteIOContext to AVIOContext. 2011-02-16 - 09d171b - lavf  52.101.0 - avformat.h                       lavu  52.39.0  - parseutils.h  * 610219a - Add av_ prefix to dump_format().  * f6c7375 - Replace parse_date() in lavf with av_parse_time() in lavu.  * ab0287f - Move find_info_tag from lavf to lavu and add av_prefix to it. 2011-02-15 - lavu 52.38.0 - merge libavcore  libavcore is merged back completely into libavutil 2011-02-10 - 55bad0c - lavc 52.113.0 - vbv_delay  Add vbv_delay field to AVCodecContext 2011-02-14 - 24a83bd - lavf 52.100.0 - AV_DISPOSITION_CLEAN_EFFECTS  Add AV_DISPOSITION_CLEAN_EFFECTS disposition flag. 2011-02-14 - 910b5b8 - lavfi 1.76.0 - AVFilterLink sample_aspect_ratio  Add sample_aspect_ratio field to AVFilterLink. 2011-02-10 - 12c14cd - lavf 52.99.0 - AVStream.disposition  Add AV_DISPOSITION_HEARING_IMPAIRED and AV_DISPOSITION_VISUAL_IMPAIRED. 2011-02-09 - 5592734 - lavc 52.112.0 - avcodec_thread_init()  Deprecate avcodec_thread_init()/avcodec_thread_free() use; instead  set thread_count before calling avcodec_open. 2011-02-09 - 778b08a - lavc 52.111.0 - threading API  Add CODEC_CAP_FRAME_THREADS with new restrictions on get_buffer()/  release_buffer()/draw_horiz_band() callbacks for appropriate codecs.  Add thread_type and active_thread_type fields to AVCodecContext. 2011-02-08 - 3940caa - lavf 52.98.0 - av_probe_input_buffer  Add av_probe_input_buffer() to avformat.h for probing format from a  ByteIOContext. 2011-02-06 - fe174fc - lavf 52.97.0 - avio.h  Add flag for non-blocking protocols: URL_FLAG_NONBLOCK 2011-02-04 - f124b08 - lavf 52.96.0 - avformat_free_context()  Add avformat_free_context() in avformat.h. 2011-02-03 - f5b82f4 - lavc 52.109.0 - add CODEC_ID_PRORES  Add CODEC_ID_PRORES to avcodec.h. 2011-02-03 - fe9a3fb - lavc 52.109.0 - H.264 profile defines  Add defines for H.264 * Constrained Baseline and Intra profiles 2011-02-02 - lavf 52.95.0  * 50196a9 - add a new installed header version.h.  * 4efd5cf, dccbd97, 93b78d1 - add several variants of public    avio_{put,get}_str* functions.  Deprecate corresponding semi-public    {put,get}_str*. 2011-02-02 - dfd2a00 - lavu 50.37.0 - log.h  Make av_dlog public. 2011-01-15 - r26374 - lavfi 1.74.0 - AVFilterBufferRefAudioProps  Rename AVFilterBufferRefAudioProps.samples_nb to nb_samples. 2011-01-14 - r26330 - lavf 52.93.0 - av_metadata_copy()  Add av_metadata_copy() in avformat.h. 2011-01-07 - r26262 - lavc 52.107.0 - deprecate reordered_opaque  Deprecate reordered_opaque in favor of pkt_pts/dts. 2011-01-07 - r26261 - lavc 52.106.0 - pkt_dts  Add pkt_dts to AVFrame, this will in the future allow multithreading decoders  to not mess up dts. 2011-01-07 - r26260 - lavc 52.105.0 - pkt_pts  Add pkt_pts to AVFrame. 2011-01-07 - r26259 - lavc 52.104.0 - av_get_profile_name()  Add av_get_profile_name to libavcodec/avcodec.h. 2010-12-27 - r26108 - lavfi 1.71.0 - AV_PERM_NEG_LINESIZES  Add AV_PERM_NEG_LINESIZES in avfilter.h. 2010-12-27 - r26104 - lavf 52.91.0 - av_find_best_stream()  Add av_find_best_stream to libavformat/avformat.h. 2010-12-27 - r26103 - lavf 52.90.0  Add AVFMT_NOSTREAMS flag for formats with no streams,  like e.g. text metadata. 2010-12-22 - r26073 - lavu 50.36.0 - file.h  Add functions av_file_map() and av_file_unmap() in file.h. 2010-12-19 - r26056 - lavu 50.35.0 - error.h  Add "not found" error codes:  AVERROR_DEMUXER_NOT_FOUND  AVERROR_MUXER_NOT_FOUND  AVERROR_DECODER_NOT_FOUND  AVERROR_ENCODER_NOT_FOUND  AVERROR_PROTOCOL_NOT_FOUND  AVERROR_FILTER_NOT_FOUND  AVERROR_BSF_NOT_FOUND  AVERROR_STREAM_NOT_FOUND 2010-12-09 - r25923 - lavcore 0.16.0 - avcore.h  Move AV_NOPTS_VALUE, AV_TIME_BASE, AV_TIME_BASE_Q symbols from  avcodec.h to avcore.h. 2010-12-04 - r25886 - lavc 52.98.0 - CODEC_CAP_NEG_LINESIZES  Add CODEC_CAP_NEG_LINESIZES codec capability flag in avcodec.h. 2010-12-04 - r25879 - lavu 50.34.0 - av_get_pix_fmt_string()  Deprecate avcodec_pix_fmt_string() in favor of  pixdesc.h/av_get_pix_fmt_string(). 2010-12-04 - r25878 - lavcore 0.15.0 - av_image_alloc()  Add av_image_alloc() to libavcore/imgutils.h. 2010-12-02 - r25862 - lavfi 1.67.0 - avfilter_graph_create_filter()  Add function avfilter_graph_create_filter() in avfiltergraph.h. 2010-11-25 - r25826 - lavfi 1.65.0 - avfilter_get_video_buffer_ref_from_arrays()  Add function avfilter_get_video_buffer_ref_from_arrays() in  avfilter.h. 2010-11-21 - r25787 - lavcore 0.14.0 - audioconvert.h  Add a public audio channel API in audioconvert.h, and deprecate the  corresponding functions in libavcodec:  avcodec_get_channel_name()  avcodec_get_channel_layout()  avcodec_get_channel_layout_string()  avcodec_channel_layout_num_channels()  and the CH_* macros defined in libavcodec/avcodec.h. 2010-11-21 - r25777 - lavf 52.85.0 - avformat.h  Add av_append_packet(). 2010-11-21 - r25776 - lavc 52.97.0 - avcodec.h  Add av_grow_packet(). 2010-11-17 - r25761 - lavcore 0.13.0 - parseutils.h  Add av_parse_color() declared in libavcore/parseutils.h. 2010-11-13 - r25745 - lavc 52.95.0 - AVCodecContext  Add AVCodecContext.subtitle_header and AVCodecContext.subtitle_header_size  fields. 2010-11-13 - r25740 - lavfi 1.62.0 - avfiltergraph.h  Make avfiltergraph.h public. 2010-11-13 - r25737 - lavfi 1.61.0 - avfiltergraph.h  Remove declarations from avfiltergraph.h for the functions:  avfilter_graph_check_validity()  avfilter_graph_config_links()  avfilter_graph_config_formats()  which are now internal.  Use avfilter_graph_config() instead. 2010-11-08 - r25708 - lavu 50.33.0 - eval.h  Deprecate functions:  av_parse_and_eval_expr(),  av_parse_expr(),  av_eval_expr(),  av_free_expr(),  in favor of the functions:  av_expr_parse_and_eval(),  av_expr_parse(),  av_expr_eval(),  av_expr_free(). 2010-11-08 - r25707 - lavfi 1.59.0 - avfilter_free()  Rename avfilter_destroy() to avfilter_free().  This change breaks libavfilter API/ABI. 2010-11-07 - r25705 - lavfi 1.58.0 - avfiltergraph.h  Remove graphparser.h header, move AVFilterInOut and  avfilter_graph_parse() declarations to libavfilter/avfiltergraph.h. 2010-11-07 - r25700 - lavfi 1.57.0 - AVFilterInOut  Rename field AVFilterInOut.filter to AVFilterInOut.filter_ctx.  This change breaks libavfilter API. 2010-11-04 - r25674 - lavfi 1.56.0 - avfilter_graph_free()  Rename avfilter_graph_destroy() to avfilter_graph_free().  This change breaks libavfilter API/ABI. 2010-11-04 - r25673 - lavfi 1.55.0 - avfilter_graph_alloc()  Add avfilter_graph_alloc() to libavfilter/avfiltergraph.h. 2010-11-02 - r25654 - lavcore 0.12.0 - av_get_bits_per_sample_fmt()  Add av_get_bits_per_sample_fmt() to libavcore/samplefmt.h and  deprecate av_get_bits_per_sample_format(). 2010-11-02 - r25653 - lavcore 0.11.0 - samplefmt.h  Add sample format functions in libavcore/samplefmt.h:  av_get_sample_fmt_name(),  av_get_sample_fmt(),  av_get_sample_fmt_string(),  and deprecate the corresponding libavcodec/audioconvert.h functions:  avcodec_get_sample_fmt_name(),  avcodec_get_sample_fmt(),  avcodec_sample_fmt_string(). 2010-11-02 - r25652 - lavcore 0.10.0 - samplefmt.h  Define enum AVSampleFormat in libavcore/samplefmt.h, deprecate enum  SampleFormat. 2010-10-16 - r25502 - lavfi 1.52.0 - avfilter_graph_config()  Add the function avfilter_graph_config() in avfiltergraph.h. 2010-10-15 - r25493 - lavf 52.83.0 - metadata API  Change demuxers to export metadata in generic format and  muxers to accept generic format. Deprecate the public  conversion API. 2010-10-10 - r25441 - lavfi 1.49.0 - AVFilterLink.time_base  Add time_base field to AVFilterLink. 2010-09-27 - r25236 - lavu 50.31.0 - av_set_options_string()  Move av_set_options_string() from libavfilter/parseutils.h to  libavutil/opt.h. 2010-09-27 - r25227 - lavfi 1.47.0 - AVFilterLink  Make the AVFilterLink fields srcpad and dstpad store the pointers to  the source and destination pads, rather than their indexes. 2010-09-27 - r25225 - lavu 50.30.0 - av_get_token()  Move av_get_token() from libavfilter/parseutils.h to  libavutil/avstring.h. 2010-09-26 - r32368 - lsws 0.12.0 - swscale.h  Add the functions sws_alloc_context() and sws_init_context(). 2010-09-26 - r25210 - lavu 50.29.0 - opt.h  Move libavcodec/opt.h to libavutil/opt.h. 2010-09-24 - r25174 - lavu 50.28.0 - av_log_set_flags()  Default of av_log() changed due to many problems to the old no repeat  detection. Read the docs of AV_LOG_SKIP_REPEATED in log.h before  enabling it for your app!. 2010-09-24 - r25167 - lavc 52.90.0 - av_opt_show2()  Deprecate av_opt_show() in favor or av_opt_show2(). 2010-09-14 - r25120 - lavu 50.27.0 - av_popcount()  Add av_popcount() to libavutil/common.h. 2010-09-08 - r25076 - lavu 50.26.0 - av_get_cpu_flags()  Add av_get_cpu_flags(). 2010-09-07 - r25067 - lavcore 0.9.0 - av_image_copy()  Add av_image_copy(). 2010-09-07 - r25064 - lavcore 0.8.0 - av_image_copy_plane()  Add av_image_copy_plane(). 2010-09-07 - r25057 - lavcore 0.7.0 - imgutils.h  Adopt hierarchical scheme for the imgutils.h function names,  deprecate the old names. 2010-09-04 - r25040 - lavu 50.25.0 - AV_CPU_FLAG_*  Deprecate the FF_MM_* flags defined in libavcodec/avcodec.h in favor  of the AV_CPU_FLAG_* flags defined in libavutil/cpu.h. 2010-08-26 - r24936 - lavc 52.87.0 - avcodec_get_channel_layout()  Add avcodec_get_channel_layout() in audioconvert.h. 2010-08-20 - r24851 - lavcore 0.6.0 - av_fill_image_max_pixsteps()  Rename av_fill_image_max_pixstep() to av_fill_image_max_pixsteps(). 2010-08-18 - r24827 - lavcore 0.5.0 - av_fill_image_max_pixstep()  Add av_fill_image_max_pixstep() in imgutils.h. 2010-08-17 - r24814 - lavu 50.24.0 - AV_NE()  Add the AV_NE macro. 2010-08-17 - r24811 - lavfi 1.36.0 - audio framework  Implement AVFilterBufferRefAudioProps struct for audio properties,  get_audio_buffer(), filter_samples() functions and related changes. 2010-08-12 - r24787 - lavcore 0.4.0 - av_get_image_linesize()  Add av_get_image_linesize() in imgutils.h. 2010-08-11 - r24773 - lavfi 1.34.0 - AVFilterBufferRef  Resize data and linesize arrays in AVFilterBufferRef to 8.   This change breaks libavfilter API/ABI. 2010-08-11 - r24768 - lavc 52.85.0 - av_picture_data_copy()  Add av_picture_data_copy in avcodec.h. 2010-08-11 - r24765 - lavfi 1.33.0 - avfilter_open()  Change avfilter_open() signature:  AVFilterContext *avfilter_open(AVFilter *filter, const char *inst_name) ->  int avfilter_open(AVFilterContext **filter_ctx, AVFilter *filter, const char *inst_name);   This change breaks libavfilter API/ABI. 2010-08-11 - r24763 - lavfi 1.32.0 - AVFilterBufferRef  Add a type field to AVFilterBufferRef, and move video specific  properties to AVFilterBufferRefVideoProps.   This change breaks libavfilter API/ABI. 2010-08-07 - r24732 - lavfi 1.31.0 - AVFilterLink  Rename AVFilterLink fields:  AVFilterLink.srcpic    ->  AVFilterLink.src_buf  AVFilterLink.cur_pic   ->  AVFilterLink.cur_buf  AVFilterLink.outpic    ->  AVFilterLink.out_buf 2010-08-07 - r24731 - lavfi 1.30.0  Rename functions and fields:  avfilter_(un)ref_pic       -> avfilter_(un)ref_buffer  avfilter_copy_picref_props -> avfilter_copy_buffer_ref_props  AVFilterBufferRef.pic      -> AVFilterBufferRef.buffer 2010-08-07 - r24730 - lavfi 1.29.0 - AVFilterBufferRef  Rename AVFilterPicRef to AVFilterBufferRef. 2010-08-07 - r24728 - lavfi 1.28.0 - AVFilterBuffer  Move format field from AVFilterBuffer to AVFilterPicRef. 2010-08-06 - r24709 - lavcore 0.3.0 - av_check_image_size()  Deprecate avcodec_check_dimensions() in favor of the function  av_check_image_size() defined in libavcore/imgutils.h. 2010-07-30 - r24592 - lavfi 1.27.0 - AVFilterBuffer  Increase size of the arrays AVFilterBuffer.data and  AVFilterBuffer.linesize from 4 to 8.   This change breaks libavfilter ABI. 2010-07-29 - r24583 - lavcore 0.2.0 - imgutils.h  Add functions av_fill_image_linesizes() and  av_fill_image_pointers(), declared in libavcore/imgutils.h. 2010-07-27 - r24518 - lavcore 0.1.0 - parseutils.h  Deprecate av_parse_video_frame_size() and av_parse_video_frame_rate()  defined in libavcodec in favor of the newly added functions  av_parse_video_size() and av_parse_video_rate() declared in  libavcore/parseutils.h. 2010-07-23 - r24439 - lavu 50.23.0 - mathematics.h  Add the M_PHI constant definition. 2010-07-22 - r24424 - lavfi 1.26.0 - media format generalization  Add a type field to AVFilterLink.   Change the field types:  enum PixelFormat format   -> int format   in AVFilterBuffer  enum PixelFormat *formats -> int *formats in AVFilterFormats  enum PixelFormat *format  -> int format   in AVFilterLink   Change the function signatures:  AVFilterFormats *avfilter_make_format_list(const enum PixelFormat *pix_fmts); ->  AVFilterFormats *avfilter_make_format_list(const int *fmts);   int avfilter_add_colorspace(AVFilterFormats **avff, enum PixelFormat pix_fmt); ->  int avfilter_add_format    (AVFilterFormats **avff, int fmt);   AVFilterFormats *avfilter_all_colorspaces(void); ->  AVFilterFormats *avfilter_all_formats    (enum AVMediaType type);   This change breaks libavfilter API/ABI. 2010-07-21 - r24393 - lavcore 0.0.0  Add libavcore. 2010-07-17 - r24291 - lavfi 1.25.0 - AVFilterBuffer  Remove w and h fields from AVFilterBuffer. 2010-07-17 - r24284 - lavfi 1.24.0 - AVFilterBuffer  Rename AVFilterPic to AVFilterBuffer. 2010-07-17 - r24278 - lavf 52.74.0 - url_fskip()  Make url_fskip() return an int error code instead of void. 2010-07-11 - r24199 - lavc 52.83.0  Add AVCodecContext.lpc_type and AVCodecContext.lpc_passes fields.  Add AVLPCType enum.  Deprecate AVCodecContext.use_lpc. 2010-07-11 - r24185 - lavc 52.82.0 - avsubtitle_free()  Add a function for free the contents of a AVSubtitle generated by  avcodec_decode_subtitle. 2010-07-11 - r24174 - lavu 50.22.0 - bswap.h and intreadwrite.h  Make the bswap.h and intreadwrite.h API public. 2010-07-08 - r24101 - lavu 50.21.0 - pixdesc.h  Rename read/write_line() to av_read/write_image_line(). 2010-07-07 - r24091 - lavfi 1.21.0 - avfilter_copy_picref_props()  Add avfilter_copy_picref_props(). 2010-07-03 - r24021 - lavc 52.79.0  Add FF_COMPLIANCE_UNOFFICIAL and change all instances of  FF_COMPLIANCE_INOFFICIAL to use FF_COMPLIANCE_UNOFFICIAL. 2010-07-02 - r23985 - lavu 50.20.0 - lfg.h  Export av_lfg_init(), av_lfg_get(), av_mlfg_get(), and av_bmg_get() through  lfg.h. 2010-06-28 - r23835 - lavfi 1.20.1 - av_parse_color()  Extend av_parse_color() syntax, make it accept an alpha value specifier and  set the alpha value to 255 by default. 2010-06-22 - r23706 - lavf 52.71.0 - URLProtocol.priv_data_size, priv_data_class  Add priv_data_size and priv_data_class to URLProtocol. 2010-06-22 - r23704 - lavf 52.70.0 - url_alloc(), url_connect()  Add url_alloc() and url_connect(). 2010-06-22 - r23702 - lavf 52.69.0 - av_register_protocol2()  Add av_register_protocol2(), deprecating av_register_protocol(). 2010-06-09 - r23551 - lavu 50.19.0 - av_compare_mod()  Add av_compare_mod() to libavutil/mathematics.h. 2010-06-05 - r23485 - lavu 50.18.0 - eval API  Make the eval API public. 2010-06-04 - r23461 - lavu 50.17.0 - AV_BASE64_SIZE  Add AV_BASE64_SIZE() macro. 2010-06-02 - r23421 - lavc 52.73.0 - av_get_codec_tag_string()  Add av_get_codec_tag_string(). 2010-06-01 - r31301 - lsws 0.11.0 - convertPalette API  Add sws_convertPalette8ToPacked32() and sws_convertPalette8ToPacked24(). 2010-05-26 - r23334 - lavc 52.72.0 - CODEC_CAP_EXPERIMENTAL  Add CODEC_CAP_EXPERIMENTAL flag. 2010-05-23 - r23255 - lavu 50.16.0 - av_get_random_seed()  Add av_get_random_seed(). 2010-05-18 - r23161 - lavf 52.63.0 - AVFMT_FLAG_RTP_HINT  Add AVFMT_FLAG_RTP_HINT as possible value for AVFormatContext.flags. 2010-05-09 - r23066 - lavfi 1.20.0 - AVFilterPicRef  Add interlaced and top_field_first fields to AVFilterPicRef. 2010-05-01 - r23002 - lavf 52.62.0 - probe function  Add av_probe_input_format2 to API, it allows ignoring probe  results below given score and returns the actual probe score. 2010-04-01 - r22806 - lavf 52.61.0 - metadata API  Add a flag for av_metadata_set2() to disable overwriting of  existing tags. 2010-04-01 - r22753 - lavc 52.66.0  Add avcodec_get_edge_width(). 2010-03-31 - r22750 - lavc 52.65.0  Add avcodec_copy_context(). 2010-03-31 - r22748 - lavf 52.60.0 - av_match_ext()  Make av_match_ext() public. 2010-03-31 - r22736 - lavu 50.14.0 - AVMediaType  Move AVMediaType enum from libavcodec to libavutil. 2010-03-31 - r22735 - lavc 52.64.0 - AVMediaType  Define AVMediaType enum, and use it instead of enum CodecType, which  is deprecated and will be dropped at the next major bump. 2010-03-25 - r22684 - lavu 50.13.0 - av_strerror()  Implement av_strerror(). 2010-03-23 - r22649 - lavc 52.60.0 - av_dct_init()  Support DCT-I and DST-I. 2010-03-15 - r22540 - lavf 52.56.0 - AVFormatContext.start_time_realtime  Add AVFormatContext.start_time_realtime field. 2010-03-13 - r22506 - lavfi 1.18.0 - AVFilterPicRef.pos  Add AVFilterPicRef.pos field. 2010-03-13 - r22501 - lavu 50.12.0 - error.h  Move error code definitions from libavcodec/avcodec.h to

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