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: 2011-12-03 - xxxxxxx - lavu 51.30.0  Add AVERROR_BUG. 2011-xx-xx - xxxxxxx - lavu 51.28.1  Add av_get_alt_sample_fmt() to samplefmt.h. 2011-11-03 - 96949da - lavu 51.23.0  Add av_strcasecmp() and av_strncasecmp() to avstring.h. 2011-10-20 - b35e9e1 - lavu 51.22.0  Add av_strtok() to avstring.h. 2011-xx-xx - xxxxxxx - lavc 53.25.0  Add nb_samples and extended_data fields to AVFrame.  Deprecate AVCODEC_MAX_AUDIO_FRAME_SIZE.  Deprecate avcodec_decode_audio3() in favor of avcodec_decode_audio4().  avcodec_decode_audio4() writes output samples to an AVFrame, which allows  audio decoders to use get_buffer(). 2011-xx-xx - xxxxxxx - lavc 53.24.0  Change AVFrame.data[4]/base[4]/linesize[4]/error[4] to [8] at next major bump.  Change AVPicture.data[4]/linesize[4] to [8] at next major bump.  Change AVCodecContext.error[4] to [8] at next major bump.  Add AV_NUM_DATA_POINTERS to simplify the bump transition. 2011-11-23 - bbb46f3 - lavu 51.18.0  Add av_samples_get_buffer_size(), av_samples_fill_arrays(), and  av_samples_alloc(), to samplefmt.h. 2011-11-23 - 8889cc4 - lavu 51.17.0  Add planar sample formats and av_sample_fmt_is_planar() to samplefmt.h. 2011-11-19 - f3a29b7 - 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 2011-11-16 - 6270671 - lavu 51.16.0  Add av_timegm() 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. 2011-11-06 - 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() 2011-09-22 - a70e787 - lavu 51.17.0  Add av_x_if_null(). 2011-09-18 - 645cebb - lavc 53.16.0  Add showall flag2 2011-09-16 - ea8de10 - lavfi 2.42.0  Add avfilter_all_channel_layouts. 2011-09-16 - 9899037 - lavfi 2.41.0  Rename avfilter_all_* function names to avfilter_make_all_*.   In particular, apply the renames:  avfilter_all_formats         -> avfilter_make_all_formats  avfilter_all_channel_layouts -> avfilter_make_all_channel_layouts  avfilter_all_packing_formats -> avfilter_make_all_packing_formats 2011-09-12 - 4381bdd - lavfi 2.40.0  Change AVFilterBufferRefAudioProps.sample_rate type from uint32_t to int. 2011-09-12 - 2c03174 - lavfi 2.40.0  Simplify signature for avfilter_get_audio_buffer(), make it  consistent with avfilter_get_video_buffer(). 2011-09-06 - 4f7dfe1 - lavfi 2.39.0  Rename libavfilter/vsink_buffer.h to libavfilter/buffersink.h. 2011-09-06 - c4415f6 - lavfi 2.38.0  Unify video and audio sink API.   In particular, add av_buffersink_get_buffer_ref(), deprecate  av_vsink_buffer_get_video_buffer_ref() and change the value for the  opaque field passed to the abuffersink init function. 2011-09-04 - 61e2e29 - lavu 51.16.0  Add av_asprintf(). 2011-08-22 - dacd827 - lavf 53.10.0  Add av_find_program_from_stream(). 2011-08-20 - 69e2c1a - lavu 51.13.0  Add av_get_media_type_string(). 2011-09-03 - fb4ca26 - lavc 53.13.0                       lavf 53.11.0                       lsws  2.1.0  Add {avcodec,avformat,sws}_get_class(). 2011-08-03 - c11fb82 - lavu 51.15.0  Add AV_OPT_SEARCH_FAKE_OBJ flag for av_opt_find() function. 2011-08-14 - 323b930 - lavu 51.12.0  Add av_fifo_peek2(), deprecate av_fifo_peek(). 2011-08-16 - 48f9e45 - lavf 53.8.0  Add avformat_query_codec(). 2011-08-16 - bca06e7 - lavc 53.11.0  Add avcodec_get_type(). 2011-08-06 - 2f63440 - lavf 53.7.0  Add error_recognition to AVFormatContext. 2011-08-02 - 9d39cbf - lavc 53.9.1  Add AV_PKT_FLAG_CORRUPT AVPacket flag. 2011-07-16 - b57df29 - lavfi 2.27.0  Add audio packing negotiation fields and helper functions.   In particular, add AVFilterPacking enum, planar, in_packings and  out_packings fields to AVFilterLink, and the functions:  avfilter_set_common_packing_formats()  avfilter_all_packing_formats() 2011-07-10 - a67c061 - lavf 53.6.0  Add avformat_find_stream_info(), deprecate av_find_stream_info(). 2011-07-10 - 0b950fe - lavc 53.8.0  Add avcodec_open2(), deprecate avcodec_open(). 2011-07-01 - b442ca6 - lavf 53.5.0 - avformat.h  Add function av_get_output_timestamp(). 2011-06-28 - 5129336 - lavu 51.11.0 - avutil.h  Define the AV_PICTURE_TYPE_NONE value in AVPictureType enum. 2011-06-19 - fd2c0a5 - lavfi 2.23.0 - avfilter.h  Add layout negotiation fields and helper functions.   In particular, add in_chlayouts and out_chlayouts to AVFilterLink,  and the functions:  avfilter_set_common_sample_formats()  avfilter_set_common_channel_layouts()  avfilter_all_channel_layouts() 2011-06-19 - 527ca39 - lavfi 2.22.0 - AVFilterFormats  Change type of AVFilterFormats.formats from int * to int64_t *,  and update formats handling API accordingly.   avfilter_make_format_list() still takes a int32_t array and converts  it to int64_t. A new function, avfilter_make_format64_list(), that  takes int64_t arrays has been added. 2011-06-19 - 44f669e - lavfi 2.21.0 - vsink_buffer.h  Add video sink buffer and vsink_buffer.h public header. 2011-06-12 - 9fdf772 - lavfi 2.18.0 - avcodec.h  Add avfilter_get_video_buffer_ref_from_frame() function in  libavfilter/avcodec.h. 2011-06-12 - c535494 - lavfi 2.17.0 - avfiltergraph.h  Add avfilter_inout_alloc() and avfilter_inout_free() functions. 2011-06-12 - 6119b23 - lavfi 2.16.0 - avfilter_graph_parse()  Change avfilter_graph_parse() signature. 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(). 2011-06-10 - c381960 - lavfi 2.15.0 - avfilter_get_audio_buffer_ref_from_arrays  Add avfilter_get_audio_buffer_ref_from_arrays() to avfilter.h. 2011-06-09 - d9f80ea - lavu 51.8.0 - 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 51.8.0 - 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 51.8.0 - opt.h  Add av_opt_free convenience function. 2011-06-06 - 95a0242 - lavfi 2.14.0 - AVFilterBufferRefAudioProps  Remove AVFilterBufferRefAudioProps.size, and use nb_samples in  avfilter_get_audio_buffer() and avfilter_default_get_audio_buffer() in  place of size. 2011-06-06 - 0bc2cca - lavu 51.6.0 - av_samples_alloc()  Switch nb_channels and nb_samples parameters order in  av_samples_alloc(). 2011-06-06 - e1c7414 - lavu 51.5.0 - av_samples_*  Change the data layout created by av_samples_fill_arrays() and  av_samples_alloc(). 2011-06-06 - 27bcf55 - lavfi 2.13.0 - vsrc_buffer.h  Make av_vsrc_buffer_add_video_buffer_ref() accepts an additional  flags parameter in input. 2011-06-03 - e977ca2 - lavfi 2.12.0 - avfilter_link_free()  Add avfilter_link_free() function. 2011-06-02 - 5ad38d9 - lavu 51.4.0 - av_force_cpu_flags()  Add av_cpu_flags() in libavutil/cpu.h. 2011-05-28 - e71f260 - lavu 51.3.0 - 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 53.3.0 - avformat.h  Add fps_probe_size to AVFormatContext. 2011-05-22 - 5ecdfd0 - lavf 53.2.0 - avformat.h  Introduce avformat_alloc_output_context2() and deprecate  avformat_alloc_output_context(). 2011-05-22 - 83db719 - lavfi 2.10.0 - vsrc_buffer.h  Make libavfilter/vsrc_buffer.h public. 2011-05-19 - c000a9f - lavfi 2.8.0 - avcodec.h  Add av_vsrc_buffer_add_frame() to libavfilter/avcodec.h. 2011-05-14 - 9fdf772 - lavfi 2.6.0 - avcodec.h  Add avfilter_get_video_buffer_ref_from_frame() to libavfilter/avcodec.h. 2011-05-18 - 64150ff - lavc 53.7.0 - AVCodecContext.request_sample_fmt  Add request_sample_fmt field to AVCodecContext. 2011-05-10 - 188dea1 - lavc 53.6.0 - 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. 2011-05-07 - 9fdf772 - lavfi 2.5.0 - avcodec.h  Add libavfilter/avcodec.h header and avfilter_copy_frame_props()  function. 2011-05-07 - 18ded93 - lavc 53.5.0 - AVFrame  Add format field to AVFrame. 2011-05-07 - 22333a6 - lavc 53.4.0 - AVFrame  Add width and height fields to AVFrame. 2011-05-01 - 35fe66a - lavfi 2.4.0 - avfilter.h  Rename AVFilterBufferRefVideoProps.pixel_aspect to  sample_aspect_ratio. 2011-05-01 - 77e9dee - lavc 53.3.0 - AVFrame  Add a sample_aspect_ratio field to AVFrame. 2011-05-01 - 1ba5727 - lavc 53.2.0 - AVFrame  Add a pkt_pos field to AVFrame. 2011-04-29 - 35ceaa7 - lavu 51.2.0 - mem.h  Add av_dynarray_add function for adding  an element to a dynamic array. 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 2011-04-08 - 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    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. 2011-03-17 - e309fdc - lavu 50.40.0 - pixfmt.h  Add PIX_FMT_BGR48LE and PIX_FMT_BGR48BE pixel formats 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. 2011-01-31 - 7b3ea55 - lavfi 1.76.0 - vsrc_buffer  Add sample_aspect_ratio fields to vsrc_buffer arguments 2011-01-31 - 910b5b8 - lavfi 1.75.0 - AVFilterLink sample_aspect_ratio

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