Never assume the API of libav* to be stable unless at least 1 month has passedsince the last major version increase. The last version increases were:libavcodec:  2011-04-18libavdevice: 2011-04-18libavfilter: 2011-04-18libavformat: 2011-04-18libpostproc: 2011-04-18libswscale:  2011-06-20libavutil:   2011-04-18  API changes, most recent first: 2011-xx-xx - xxxxxxx - lavu 51.18.0  Add av_samples_get_buffer_size(), av_samples_fill_arrays(), and  av_samples_alloc(), to samplefmt.h. 2011-xx-xx - xxxxxxx - lavu 51.17.0  Add planar sample formats and av_sample_fmt_is_planar() to samplefmt.h. 2011-xx-xx - xxxxxxx - lavc 53.21.0  Move some AVCodecContext fields to a new private struct, AVCodecInternal,  which is accessed from a new field, AVCodecContext.internal.  - fields moved:      AVCodecContext.internal_buffer       --> AVCodecInternal.buffer      AVCodecContext.internal_buffer_count --> AVCodecInternal.buffer_count      AVCodecContext.is_copy               --> AVCodecInternal.is_copy 2011-11-13 - lavf 53.15.0  New interrupt callback API, allowing per-AVFormatContext/AVIOContext  interrupt callbacks.  6aa0b98 Add AVIOInterruptCB struct and the interrupt_callback field to          AVFormatContext.  1dee0ac Add avio_open2() with additional parameters. Those are          an interrupt callback and an options AVDictionary.          This will allow passing AVOptions to protocols after lavf          54.0. 2011-11-xx - xxxxxxx - lavu 51.16.0  Add av_timegm() 2011-11-06 - ba04ecf - lavu 51.14.0  Add av_strcasecmp() and av_strncasecmp() to avstring.h. 2011-11-06 - 07b172f - lavu 51.13.0  Add av_toupper()/av_tolower() 2011-11-05 - b6d08f4 - lavf 53.13.0  Add avformat_network_init()/avformat_network_uninit() 2011-10-27 - 512557b - lavc 53.15.0  Remove avcodec_parse_frame.  Deprecate AVCodecContext.parse_only and CODEC_CAP_PARSE_ONLY. 2011-10-19 - 569129a - lavf 53.10.0  Add avformat_new_stream(). Deprecate av_new_stream(). 2011-10-13 - b631fba - lavf 53.9.0  Add AVFMT_NO_BYTE_SEEK AVInputFormat flag. 2011-10-12 - lavu 51.12.0  AVOptions API rewrite.   - 145f741 FF_OPT_TYPE* renamed to AV_OPT_TYPE_*  - new setting/getting functions with slightly different semantics:        dac66da av_set_string3 -> av_opt_set                av_set_double  -> av_opt_set_double                av_set_q       -> av_opt_set_q                av_set_int     -> av_opt_set_int         41d9d51 av_get_string  -> av_opt_get                av_get_double  -> av_opt_get_double                av_get_q       -> av_opt_get_q                av_get_int     -> av_opt_get_int   - 8c5dcaa trivial rename av_next_option -> av_opt_next  - 641c7af new functions - av_opt_child_next, av_opt_child_class_next    and av_opt_find2() 2011-09-03 - fb4ca26 - lavc 53.10.0                       lavf 53.6.0                       lsws  2.1.0  Add {avcodec,avformat,sws}_get_class(). 2011-09-03 - c11fb82 - lavu 51.10.0  Add AV_OPT_SEARCH_FAKE_OBJ flag for av_opt_find() function. 2011-08-26 - f2011ed - lavu 51.9.0  Add av_fifo_peek2(), deprecate av_fifo_peek(). 2011-08-16 - 48f9e45 - lavf 53.4.0  Add avformat_query_codec(). 2011-08-16 - bca06e7 - lavc 53.8.0  Add avcodec_get_type(). 2011-08-06 - 2f63440 - lavf 53.4.0  Add error_recognition to AVFormatContext. 2011-08-02 - 9d39cbf - lavc 53.7.1  Add AV_PKT_FLAG_CORRUPT AVPacket flag. 2011-07-10 - a67c061 - lavf 53.3.0  Add avformat_find_stream_info(), deprecate av_find_stream_info(). 2011-07-10 - 0b950fe - lavc 53.6.0  Add avcodec_open2(), deprecate avcodec_open(). 2011-06-23 - 67e9ae1 - lavu 51.8.0 - attributes.h  Add av_printf_format(). 2011-06-16 - 05e84c9, 25de595 - lavf 53.2.0 - avformat.h  Add avformat_open_input and avformat_write_header().  Deprecate av_open_input_stream, av_open_input_file,  AVFormatParameters and av_write_header. 2011-06-16 - 7e83e1c, dc59ec5 - lavu 51.7.0 - opt.h  Add av_opt_set_dict() and av_opt_find().  Deprecate av_find_opt().  Add AV_DICT_APPEND flag. 2011-06-10 - cb7c11c - lavu 51.6.0 - opt.h  Add av_opt_flag_is_set(). 2011-06-08 - d9f80ea - lavu 51.5.0 - AVMetadata  Move AVMetadata from lavf to lavu and rename it to  AVDictionary -- new installed header dict.h.  All av_metadata_* functions renamed to av_dict_*. 2011-06-07 - a6703fa - lavu 51.4.0 - av_get_bytes_per_sample()  Add av_get_bytes_per_sample() in libavutil/samplefmt.h.  Deprecate av_get_bits_per_sample_fmt(). 2011-06-05 - b39b062 - lavu 51.3.0 - opt.h  Add av_opt_free convenience function. 2011-05-28 - 0420bd7 - lavu 51.2.0 - pixdesc.h  Add av_get_pix_fmt_name() in libavutil/pixdesc.h, and deprecate  avcodec_get_pix_fmt_name() in libavcodec/avcodec.h in its favor. 2011-05-25 - 30315a8 - lavf 53.1.0 - avformat.h  Add fps_probe_size to AVFormatContext. 2011-05-18 - 64150ff - lavc 53.4.0 - AVCodecContext.request_sample_fmt  Add request_sample_fmt field to AVCodecContext. 2011-05-10 - 188dea1 - lavc 53.3.0 - avcodec.h  Deprecate AVLPCType and the following fields in  AVCodecContext: lpc_coeff_precision, prediction_order_method,  min_partition_order, max_partition_order, lpc_type, lpc_passes.  Corresponding FLAC encoder options should be used instead. 2011-04-26 - bebe72f - lavu 51.1.0 - avutil.h  Add AVPictureType enum and av_get_picture_type_char(), deprecate  FF_*_TYPE defines and av_get_pict_type_char() defined in  libavcodec/avcodec.h. 2011-04-26 - 10d3940 - lavfi 2.3.0 - avfilter.h  Add pict_type and key_frame fields to AVFilterBufferRefVideo. 2011-04-26 - 7a11c82 - lavfi 2.2.0 - vsrc_buffer  Add sample_aspect_ratio fields to vsrc_buffer arguments 2011-04-21 - 94f7451 - lavc 53.1.0 - avcodec.h  Add CODEC_CAP_SLICE_THREADS for codecs supporting sliced threading. 2011-04-15 - lavc 52.120.0 - avcodec.h  AVPacket structure got additional members for passing side information:    4de339e introduce side information for AVPacket    2d8591c make containers pass palette change in AVPacket 2011-04-12 - lavf 52.107.0 - avio.h  Avio cleanup, part II - deprecate the entire URLContext API:    175389c add avio_check as a replacement for url_exist    ff1ec0c add avio_pause and avio_seek_time as replacements            for _av_url_read_fseek/fpause    cdc6a87 deprecate av_protocol_next(), avio_enum_protocols            should be used instead.    80c6e23 rename url_set_interrupt_cb->avio_set_interrupt_cb.    f87b1b3 rename open flags: URL_* -> AVIO_*    f8270bb add avio_enum_protocols.    5593f03 deprecate URLProtocol.    c486dad deprecate URLContext.    026e175 deprecate the typedef for URLInterruptCB    8e76a19 deprecate av_register_protocol2.    b840484 deprecate URL_PROTOCOL_FLAG_NESTED_SCHEME    1305d93 deprecate av_url_read_seek    fa104e1 deprecate av_url_read_pause    727c7aa deprecate url_get_filename().    5958df3 deprecate url_max_packet_size().    1869ea0 deprecate url_get_file_handle().    32a97d4 deprecate url_filesize().    e52a914 deprecate url_close().    58a48c6 deprecate url_seek().    925e908 deprecate url_write().    dce3756 deprecate url_read_complete().    bc371ac deprecate url_read().    0589da0 deprecate url_open().    62eaaea deprecate url_connect.    5652bb9 deprecate url_alloc.    333e894 deprecate url_open_protocol    e230705 deprecate url_poll and URLPollEntry 2011-04-10 - lavu  50.40.0 - pixfmt.h  Add PIX_FMT_BGR48LE and PIX_FMT_BGR48BE pixel formats 2011-04-08 - lavf 52.106.0 - avformat.h  Minor avformat.h cleanup:    a9bf9d8 deprecate av_guess_image2_codec    c3675df rename avf_sdp_create->av_sdp_create 2011-04-03 - lavf 52.105.0 - avio.h  Large-scale renaming/deprecating of AVIOContext-related functions:    724f6a0 deprecate url_fdopen    403ee83 deprecate url_open_dyn_packet_buf    6dc7d80 rename url_close_dyn_buf       -> avio_close_dyn_buf    b92c545 rename url_open_dyn_buf        -> avio_open_dyn_buf    8978fed introduce an AVIOContext.seekable field as a replacement for            AVIOContext.is_streamed and url_is_streamed()    b64030f deprecate get_checksum()    4c4427a deprecate init_checksum()    4ec153b deprecate udp_set_remote_url/get_local_port    933e90a deprecate av_url_read_fseek/fpause    8d9769a deprecate url_fileno    b7f2fdd rename put_flush_packet -> avio_flush    35f1023 deprecate url_close_buf    83fddae deprecate url_open_buf    d9d86e0 rename url_fprintf -> avio_printf    59f65d9 deprecate url_setbufsize    3e68b3b deprecate url_ferror    66e5b1d deprecate url_feof    e8bb2e2 deprecate url_fget_max_packet_size    76aa876 rename url_fsize -> avio_size    e519753 deprecate url_fgetc    655e45e deprecate url_fgets    a2704c9 rename url_ftell -> avio_tell    e16ead0 deprecate get_strz() in favor of avio_get_str    0300db8,2af07d3 rename url_fskip -> avio_skip    6b4aa5d rename url_fseek -> avio_seek    61840b4 deprecate put_tag    22a3212 rename url_fopen/fclose -> avio_open/close.    0ac8e2b deprecate put_nbyte    77eb550 rename put_byte          -> avio_w8                   put_[b/l]e<type>  -> avio_w[b/l]<type>                   put_buffer        -> avio_write    b7effd4 rename get_byte          -> avio_r8,                   get_[b/l]e<type>  -> avio_r[b/l]<type>                   get_buffer        -> avio_read    b3db9ce deprecate get_partial_buffer    8d9ac96 rename av_alloc_put_byte -> avio_alloc_context 2011-03-25 - 34b47d7 - lavc 52.115.0 - AVCodecContext.audio_service_type  Add audio_service_type field to AVCodecContext. 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

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