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:    2012-01-27libavdevice:   2011-04-18libavfilter:   2012-06-22libavformat:   2012-01-27libavresample: 2012-04-24libswscale:    2011-06-20libavutil:     2011-04-18  API changes, most recent first: 2012-10-xx - xxxxxxx - lavu 51.43.0 - aes.h, md5.h, sha.h, tree.h  Add functions for allocating the opaque contexts for the algorithms,  deprecate the context size variables. 2012-10-xx - xxxxxxx - lavf 54.18.0 - avio.h  Add avio_closep to complement avio_close. 2012-10-xx - xxxxxxx - lavu 51.42.0 - pixfmt.h  Rename PixelFormat to AVPixelFormat and all PIX_FMT_* to AV_PIX_FMT_*.  To provide backwards compatibility, PixelFormat is now #defined as  AVPixelFormat.  Note that this can break user code that includes pixfmt.h and uses the  'PixelFormat' identifier. Such code should either #undef PixelFormat  or stop using the PixelFormat name. 2012-10-05 - e7ba5b1 - lavr 1.0.0 - avresample.h  Data planes parameters to avresample_convert() and  avresample_read() are now uint8_t** instead of void**.  Libavresample is now stable. 2012-09-24 - a42aada - lavc 54.28.0 - avcodec.h  Add avcodec_free_frame(). This function must now  be used for freeing an AVFrame. 2012-09-12 - 8919fee - lavu 51.41.0 - audioconvert.h  Added AV_CH_LOW_FREQUENCY_2 channel mask value. 2012-09-04 - 686a329 - lavu 51.40.0 - opt.h  Reordered the fields in default_val in AVOption, changed which  default_val field is used for which AVOptionType. 2012-08-30 - a231832 - lavc 54.26.1 - avcodec.h  Add codec descriptor properties AV_CODEC_PROP_LOSSY and  AV_CODEC_PROP_LOSSLESS. 2012-08-18 - lavc 54.26 - avcodec.h  Add codec descriptors for accessing codec properties without having  to refer to a specific decoder or encoder.   c223d79 - Add an AVCodecDescriptor struct and functions            avcodec_descriptor_get() and avcodec_descriptor_next().  51efed1 - Add AVCodecDescriptor.props and AV_CODEC_PROP_INTRA_ONLY.  91e59fe - Add avcodec_descriptor_get_by_name().  2012-08-08 - 1d9c2dc - lavu 51.39 - avutil.h  Don't implicitly include libavutil/common.h in avutil.h 2012-08-08 - 987170c - lavu 51.38 - dict.h  Add av_dict_count(). 2012-08-07 - 104e10f - lavc 54.25 - avcodec.h  Rename CodecID to AVCodecID and all CODEC_ID_* to AV_CODEC_ID_*.  To provide backwards compatibility, CodecID is now #defined as AVCodecID.  Note that this can break user code that includes avcodec.h and uses the  'CodecID' identifier. Such code should either #undef CodecID or stop using the  CodecID name. 2012-08-03 - 239fdf1 - lavu 51.37.1 - cpu.h                       lsws 2.1.1   - swscale.h  Rename AV_CPU_FLAG_MMX2  ---> AV_CPU_FLAG_MMXEXT.  Rename SWS_CPU_CAPS_MMX2 ---> SWS_CPU_CAPS_MMXEXT. 2012-07-29 - 681ed00 - lavf 54.13.0 - avformat.h  Add AVFMT_FLAG_NOBUFFER for low latency use cases. 2012-07-20 - b70d89a - lavfi 3.0.0 - avfilter.h  Add avfilter_unref_bufferp(). 2012-07-10 - 5fade8a - lavu 51.37.0  Add av_malloc_array() and av_mallocz_array() 2012-06-22 - d3d3a32 - lavu 51.34.0  Add av_usleep() 2012-06-20 - ae0a301 - lavu 51.33.0  Move av_gettime() to libavutil, add libavutil/time.h 2012-06-09 - 3971be0 - lavr 0.0.3  Add a parameter to avresample_build_matrix() for Dolby/DPLII downmixing. 2012-06-12 - 9baeff9 - lavfi 2.23.0 - avfilter.h  Add AVFilterContext.nb_inputs/outputs. Deprecate  AVFilterContext.input/output_count. 2012-06-12 - 84b9fbe - lavfi 2.22.0 - avfilter.h  Add avfilter_pad_get_type() and avfilter_pad_get_name(). Those  should now be used instead of accessing AVFilterPad members  directly. 2012-06-12 - b0f0dfc - lavu 51.32.0 - audioconvert.h  Add av_get_channel_layout_channel_index(), av_get_channel_name()  and av_channel_layout_extract_channel(). 2012-05-25 - 154486f - lavu 51.31.0 - opt.h  Add av_opt_set_bin() 2012-05-26 - e9cef89 - lavf 54.3.0  Add AVFMT_TS_NONSTRICT format flag to indicate that a muxer supports  non-increasing monotone timestamps. 2012-05-15 - lavfi 2.17.0  Add support for audio filters  ac71230/a2cd9be - add video/audio buffer sink in a new installed                    header buffersink.h  720c6b7 - add av_buffersrc_write_frame(), deprecate            av_vsrc_buffer_add_frame()  ab16504 - add avfilter_copy_buf_props()  9453c9e - add extended_data to AVFilterBuffer  1b8c927 - add avfilter_get_audio_buffer_ref_from_arrays() 2012-05-09 - lavu 51.30.0 - samplefmt.h  142e740 - add av_samples_copy()  6d7f617 - add av_samples_set_silence() 2012-05-09 - a5117a2 - lavc 54.13.1  For audio formats with fixed frame size, the last frame  no longer needs to be padded with silence, libavcodec  will handle this internally (effectively all encoders  behave as if they had CODEC_CAP_SMALL_LAST_FRAME set). 2012-05-07 - 828bd08 - lavc 54.13.0 - avcodec.h  Add sample_rate and channel_layout fields to AVFrame. 2012-05-01 - 4010d72 - lavr 0.0.1  Change AV_MIX_COEFF_TYPE_Q6 to AV_MIX_COEFF_TYPE_Q8. 2012-04-25 - 3527a73 - lavu 51.29.0 - cpu.h  Add av_parse_cpu_flags() 2012-04-24 - c8af852 - lavr 0.0.0  Add libavresample audio conversion library 2012-04-20 - 0c0d1bc - lavu 51.28.0 - audio_fifo.h  Add audio FIFO functions:    av_audio_fifo_free()    av_audio_fifo_alloc()    av_audio_fifo_realloc()    av_audio_fifo_write()    av_audio_fifo_read()    av_audio_fifo_drain()    av_audio_fifo_reset()    av_audio_fifo_size()    av_audio_fifo_space() 2012-04-14 - lavfi 2.16.0 - avfiltergraph.h  d7bcc71 Add avfilter_graph_parse2().  91d3cbe Add avfilter_inout_alloc() and avfilter_inout_free(). 2012-04-08 - 4d693b0 - lavu 51.27.0 - samplefmt.h  Add av_get_packed_sample_fmt() and av_get_planar_sample_fmt() 2012-04-05 - 5cc51a5 - lavu 51.26.0 - audioconvert.h  Add av_get_default_channel_layout() 2012-03-06 - 4d851f8 - lavu 51.25.0 - cpu.h  Add av_set_cpu_flags_mask(). 2012-03-05 - lavc 54.8.0  6699d07 Add av_get_exact_bits_per_sample()  9524cf7 Add av_get_audio_frame_duration() 2012-03-04 - 44fe77b - lavc 54.7.0 - avcodec.h  Add av_codec_is_encoder/decoder(). 2012-03-01 - 442c132 - lavc 54.3.0 - avcodec.h  Add av_packet_shrink_side_data. 2012-02-29 - dd2a4bc - lavf 54.2.0 - avformat.h  Add AVStream.attached_pic and AV_DISPOSITION_ATTACHED_PIC,  used for dealing with attached pictures/cover art. 2012-02-25 - c9bca80 - lavu 51.24.0 - error.h  Add AVERROR_UNKNOWN  NOTE: this was backported to 0.8 2012-02-20 - e9cda85 - lavc 54.2.0  Add duration field to AVCodecParserContext 2012-02-20 - 0b42a93 - lavu 51.23.1 - mathematics.h  Add av_rescale_q_rnd() 2012-02-08 - 38d5533 - lavu 51.22.1 - pixdesc.h  Add PIX_FMT_PSEUDOPAL flag. 2012-02-08 - 52f82a1 - lavc 54.01.0  Add avcodec_encode_video2() and deprecate avcodec_encode_video(). 2012-02-01 - 316fc74 - lavc 54.01.0  Add av_fast_padded_malloc() as alternative for av_realloc() when aligned  memory is required. The buffer will always have FF_INPUT_BUFFER_PADDING_SIZE  zero-padded bytes at the end. 2012-01-31 - dd6d3b0 - lavf 54.01.0  Add avformat_get_riff_video_tags() and avformat_get_riff_audio_tags().  NOTE: this was backported to 0.8 2012-01-31 - af08d9a - lavc 54.01.0  Add avcodec_is_open() function.  NOTE: this was backported to 0.8 2012-01-30 - 8b93312 - lavu 51.22.0 - intfloat.h  Add a new installed header libavutil/intfloat.h with int/float punning  functions.  NOTE: this was backported to 0.8 2012-01-25 - lavf 53.22.0  f1caf01 Allow doing av_write_frame(ctx, NULL) for flushing possible          buffered data within a muxer. Added AVFMT_ALLOW_FLUSH for          muxers supporting it (av_write_frame makes sure it is called          only for muxers with this flag). ------------------------------8<-------------------------------------                   0.8 branch was cut here----------------------------->8-------------------------------------- 2012-01-15 - lavc 53.34.0  New audio encoding API:  b2c75b6 Add CODEC_CAP_VARIABLE_FRAME_SIZE capability for use by audio          encoders.  5ee5fa0 Add avcodec_fill_audio_frame() as a convenience function.  b2c75b6 Add avcodec_encode_audio2() and deprecate avcodec_encode_audio().          Add AVCodec.encode2(). 2012-01-12 - 3167dc9 - lavfi 2.15.0  Add a new installed header -- libavfilter/version.h -- with version macros. 2011-01-03 - b73ec05 - lavu 51.21.0  Add av_popcount64 2011-12-25 - lavfi 2.14.0  e1d9dbf Add a new installed header - buffersrc.h  It contains a new function av_buffersrc_buffer() that allows passing  frames to the 'buffer' filter, but unlike av_vsrc_buffer_add_frame()  it allows for direct rendering.  1c9e340 Add avfilter_copy_frame_props() for copying properties from  AVFrame to AVFilterBufferRef. 2011-12-25 - lavc 53.31.0  Add the following new fields to AVFrame:    b58dbb5 sample_aspect_ratio    3a2ddf7 width, height    8a4a5f6 format 2011-12-18 - 8400b12 - lavc 53.28.1  Deprecate AVFrame.age. The field is unused. 2011-12-12 - 5266045 - lavf 53.17.0  Add avformat_close_input().  Deprecate av_close_input_file() and av_close_input_stream(). 2011-12-02 - 0eea212 - 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(). 2011-12-04 - 560f773 - 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_deinit() 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 - lavu 51.9.0  - f2011ed Add av_fifo_peek2(), deprecate av_fifo_peek().  - add41de..abc78a5 Do not include intfloat_readwrite.h,    mathematics.h, rational.h, pixfmt.h, or log.h from avutil.h. 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().  NOTE: this was backported to 0.7 2011-07-10 - 0b950fe - lavc 53.6.0  Add avcodec_open2(), deprecate avcodec_open().  NOTE: this was backported to 0.7   Add avcodec_alloc_context3. Deprecate avcodec_alloc_context() and  avcodec_alloc_context2(). 2011-06-23 - 67e9ae1 - lavu 51.8.0 - attributes.h  Add av_printf_format(). ------------------------------8<-------------------------------------                   0.7 branch was cut here----------------------------->8-------------------------------------- 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

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