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: 2012-04-24libpostproc:   2011-04-18libswresample: 2011-09-19libswscale:    2011-06-20libavutil:     2011-04-18  API changes, most recent first: 2012-08-13 - xxxxxxx - lavfi 3.8.100 - avfilter.h  Add avfilter_get_class() function, and priv_class field to AVFilter  struct. 2012-08-13 - xxxxxxx - lavu 51.69.100 - opt.h  Add AV_OPT_FLAG_FILTERING_PARAM symbol in opt.h. 2012-07-31 - xxxxxxx - lavc 54.46.100  Add channels field to AVFrame. 2012-07-30 - xxxxxxx - lavu 51.66.100  Add av_get_channel_description()  and av_get_standard_channel_layout() functions. 2012-07-20 - xxxxxxx - lavc 54.43.100  Add decode_error_flags field to AVFrame. 2012-07-20 - xxxxxxx - lavf 54.18.100  Add avformat_match_stream_specifier() function. 2012-07-14 - xxxxxxx - 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 - xxxxxxx - lavc 54.33.100  Add av_fast_padded_mallocz(). 2012-07-10 - xxxxxxx - lavfi 3.2.0 - avfilter.h  Add init_opaque() callback to AVFilter struct. 2012-06-26 - xxxxxxx - 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 - xxxxxxx - lavu 51.62.100 - version.h  version moved from avutil.h to version.h 2012-04-11 - xxxxxxx - lavu 51.58.100 - error.h  Add av_make_error_string() and av_err2str() utilities to  libavutil/error.h. 2012-06-05 - xxxxxxx - lavc 54.24.100  Add pkt_duration field to AVFrame. 2012-05-24 - xxxxxxx - lavu 51.54.100  Move AVPALETTE_SIZE and AVPALETTE_COUNT macros from  libavcodec/avcodec.h to libavutil/pixfmt.h. 2012-05-07 - xxxxxxx - lavf 54.5.100  Add av_guess_sample_aspect_ratio() function. 2012-04-20 - xxxxxxx - lavfi 2.70.100  Add avfilter_unref_bufferp() to avfilter.h. 2012-04-12 - xxxxxxx - 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. 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. 2012-03-05 - 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). 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. 2011-01-03 - 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.   - 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(). 2011-08-26 - lavu 51.9.0  - 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 53.8.0  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().  NOTE: this was backported to 0.7 2011-07-10 - 0b950fe - lavc 53.8.0  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(). 2011-07-01 - 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. 

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