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:    2012-01-27libavdevice:   2011-04-18libavfilter:   2012-06-22libavformat:   2012-01-27libavresample: 2012-10-05libpostproc:   2011-04-18libswresample: 2011-09-19libswscale:    2011-06-20libavutil:     2012-10-22  API changes, most recent first: 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 - 2ada584d - 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. 2012-11-03 - 481fdeee - lavu 52.3.100 - opt.h  Add AV_OPT_TYPE_SAMPLE_FMT value to AVOptionType enum. 2012-10-21 - 6fb2fd8 - lavc  54.68.100 - avcodec.h                       lavfi  3.20.100 - avfilter.h  Add AV_PKT_DATA_STRINGS_METADATA side data type, used to transmit key/value  strings between AVPacket and AVFrame, and add metadata field to  AVCodecContext (which shall not be accessed by users; see AVFrame metadata  instead). 2012-09-27 - a70b493 - lavd 54.3.100 - version.h  Add LIBAVDEVICE_IDENT symbol. 2012-09-27 - a70b493 - lavfi 3.18.100 - version.h  Add LIBAVFILTER_IDENT symbol. 2012-09-27 - a70b493 - libswr 0.16.100 - version.h  Add LIBSWRESAMPLE_VERSION, LIBSWRESAMPLE_BUILD  and LIBSWRESAMPLE_IDENT symbols. 2012-09-06 - 29e972f - lavu 51.72.100 - parseutils.h  Add av_small_strptime() time parsing function.   Can be used as a stripped-down replacement for strptime(), on  systems which do not support it. 2012-08-25 - 2626cc4 - lavf 54.28.100  Matroska demuxer now identifies SRT subtitles as AV_CODEC_ID_SUBRIP instead  of AV_CODEC_ID_TEXT. 2012-08-13 - 5c0d8bc - lavfi 3.8.100 - avfilter.h  Add avfilter_get_class() function, and priv_class field to AVFilter  struct. 2012-08-12 - a25346e - lavu 51.69.100 - opt.h  Add AV_OPT_FLAG_FILTERING_PARAM symbol in opt.h. 2012-07-31 - 23fc4dd - lavc 54.46.100  Add channels field to AVFrame. 2012-07-30 - f893904 - lavu 51.66.100  Add av_get_channel_description()  and av_get_standard_channel_layout() functions. 2012-07-21 - 016a472 - lavc 54.43.100  Add decode_error_flags field to AVFrame. 2012-07-20 - b062936 - lavf 54.18.100  Add avformat_match_stream_specifier() function. 2012-07-14 - f49ec1b - lavc 54.38.100 - avcodec.h  Add metadata to AVFrame, and the accessor functions  av_frame_get_metadata() and av_frame_set_metadata(). 2012-07-10 - 0e003d8 - lavc 54.33.100  Add av_fast_padded_mallocz(). 2012-07-10 - 21d5609 - lavfi 3.2.0 - avfilter.h  Add init_opaque() callback to AVFilter struct. 2012-06-26 - e6674e4 - lavu 51.63.100 - imgutils.h  Add functions to libavutil/imgutils.h:  av_image_get_buffer_size()  av_image_fill_arrays()  av_image_copy_to_buffer() 2012-06-24 - c41899a - lavu 51.62.100 - version.h  version moved from avutil.h to version.h 2012-04-11 - 359abb1 - lavu 51.58.100 - error.h  Add av_make_error_string() and av_err2str() utilities to  libavutil/error.h. 2012-06-05 - 62b39d4 - lavc 54.24.100  Add pkt_duration field to AVFrame. 2012-05-24 - f2ee065 - lavu 51.54.100  Move AVPALETTE_SIZE and AVPALETTE_COUNT macros from  libavcodec/avcodec.h to libavutil/pixfmt.h. 2012-05-14 - 94a9ac1 - lavf 54.5.100  Add av_guess_sample_aspect_ratio() function. 2012-04-20 - 65fa7bc - lavfi 2.70.100  Add avfilter_unref_bufferp() to avfilter.h. 2012-04-13 - 162e400 - lavfi 2.68.100  Install libavfilter/asrc_abuffer.h public header. 2012-03-26 - a67d9cf - lavfi 2.66.100  Add avfilter_fill_frame_from_{audio_,}buffer_ref() functions. 2013-xx-xx - xxxxxxx - lavu 52.7.0 - dict.h  Add av_dict_parse_string() to set multiple key/value pairs at once from a  string. 2013-01-xx - xxxxxxx - lavu 52.6.0 - avstring.h  Add av_strnstr() 2013-01-xx - xxxxxxx - lavu 52.5.0 - hmac.h  Add AVHMAC. 2013-01-13 - xxxxxxx - lavc 54.36.0 - vdpau.h  Add AVVDPAUContext struct for VDPAU hardware-accelerated decoding. 2013-01-12 - 169fb94 - lavu 52.4.0 - pixdesc.h  Add AV_PIX_FMT_VDPAU flag. 2013-01-07 - 074a00d - lavr 1.1.0  Add avresample_set_channel_mapping() for input channel reordering,  duplication, and silencing. 2012-12-29 - d8fd06c - lavu 52.3.0 - avstring.h  Add av_basename() and av_dirname(). 2012-11-11 - 5980f5d - lavu 52.2.0 - audioconvert.h  Rename audioconvert.h to channel_layout.h. audioconvert.h is now deprecated. 2012-11-05 - dfde8a3 - lavu 52.1.0 - intmath.h  Add av_ctz() for trailing zero bit count 2012-10-21 - a893655 - lavu 51.45.0 - error.h  Add AVERROR_EXPERIMENTAL 2012-10-12 - d2fcb35 - lavu 51.44.0 - pixdesc.h  Add functions for accessing pixel format descriptors.  Accessing the av_pix_fmt_descriptors array directly is now  deprecated. 2012-10-11 - 9a92aea - lavu 51.43.0 - aes.h, md5.h, sha.h, tree.h  Add functions for allocating the opaque contexts for the algorithms, 2012-10-10 - b522000 - lavf 54.18.0 - avio.h  Add avio_closep to complement avio_close. 2012-10-08 - 78071a1 - 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 - 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. 2012-07-10 - 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() 2012-05-15 - 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(). 2012-04-08 - 4d693b0 - lavu 51.27.0 - samplefmt.h  Add av_get_packed_sample_fmt() and av_get_planar_sample_fmt() 2012-03-21 - b75c67d - lavu 51.43.100  Add bprint.h for bprint API. 2012-02-21 - 9cbf17e - lavc 54.4.100  Add av_get_pcm_codec() function. 2012-02-16 - 560b224 - libswr 0.7.100  Add swr_set_matrix() function. 2012-02-09 - c28e7af - lavu 51.39.100  Add a new installed header libavutil/timestamp.h with timestamp  utilities. 2012-02-06 - 70ffda3 - lavu 51.38.100  Add av_parse_ratio() function to parseutils.h. 2012-02-06 - 70ffda3 - lavu 51.38.100  Add AV_LOG_MAX_OFFSET macro to log.h. 2012-02-02 - 0eaa123 - lavu 51.37.100  Add public timecode helpers. 2012-01-24 - 0c3577b - lavfi 2.60.100  Add avfilter_graph_dump. 2012-03-20 - 3c90cc2 - lavfo 54.2.0  Deprecate av_read_packet(), use av_read_frame() with  AVFMT_FLAG_NOPARSE | AVFMT_FLAG_NOFILLIN in AVFormatContext.flags 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 54.1.0  Add avcodec_encode_video2() and deprecate avcodec_encode_video(). 2012-02-01 - 316fc74 - lavc 54.1.0  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 54.1.0  Add avformat_get_riff_video_tags() and avformat_get_riff_audio_tags().  NOTE: this was backported to 0.8 2012-01-31 - af08d9a - lavc 54.1.0  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). 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. 2011-12-08 - a502939 - lavfi 2.52.0  Add av_buffersink_poll_frame() to buffersink.h. 2011-12-08 - 26c6fec - lavu 51.31.0  Add av_log_format_line. 2011-12-03 - 976b095 - lavu 51.30.0  Add AVERROR_BUG. 2011-11-24 - 573ffbb - 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. 2012-01-03 - b73ec05 - lavu 51.21.0  Add av_popcount64 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.

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