path: root/doc/APIchanges

Never assume the API of libav* to be stable unless at least 1 month has passed
since the last major version increase.

The last version increases were:
libavcodec:    2012-01-27
libavdevice:   2011-04-18
libavfilter:   2011-04-18
libavformat:   2012-01-27
libavresample: 2012-04-24
libpostproc:   2011-04-18
libswresample: 2011-09-19
libswscale:    2011-06-20
libavutil:     2011-04-18


API changes, most recent first:

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-xx-xx - xxxxxxx - 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 - e0e0793 - 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.

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
  Add sample_aspect_ratio field to AVFilterLink.

2011-01-15 - a242ac3 - lavfi 1.74.0 - AVFilterBufferRefAudioProps
  Rename AVFilterBufferRefAudioProps.samples_nb to nb_samples.

2011-01-14 - 7f88a5b - lavf 52.93.0 - av_metadata_copy()
  Add av_metadata_copy() in avformat.h.

2011-01-07 - 81c623f - lavc 52.107.0 - deprecate reordered_opaque
  Deprecate reordered_opaque in favor of pkt_pts/dts.

2011-01-07 - 1919fea - 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 - 393cbb9 - lavc 52.105.0 - pkt_pts
  Add pkt_pts to AVFrame.

2011-01-07 - 060ec0a - lavc 52.104.0 - av_get_profile_name()
  Add av_get_profile_name to libavcodec/avcodec.h.

2010-12-27 - 0ccabee - lavfi 1.71.0 - AV_PERM_NEG_LINESIZES
  Add AV_PERM_NEG_LINESIZES in avfilter.h.

2010-12-27 - 9128ae0 - lavf 52.91.0 - av_find_best_stream()
  Add av_find_best_stream to libavformat/avformat.h.

2010-12-27 - 107a7e3 - lavf 52.90.0
  Add AVFMT_NOSTREAMS flag for formats with no streams,
  like e.g. text metadata.

2010-12-22 - 0328b9e - lavu 50.36.0 - file.h
  Add functions av_file_map() and av_file_unmap() in file.h.

2010-12-19 - 0bc55f5 - 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 - c61cdd0 - 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 - 16cfc96 - lavc 52.98.0 - CODEC_CAP_NEG_LINESIZES
  Add CODEC_CAP_NEG_LINESIZES codec capability flag in avcodec.h.

2010-12-04 - bb4afa1 - 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 - 4da12e3 - lavcore 0.15.0 - av_image_alloc()
  Add av_image_alloc() to libavcore/imgutils.h.

2010-12-02 - 037be76 - lavfi 1.67.0 - avfilter_graph_create_filter()
  Add function avfilter_graph_create_filter() in avfiltergraph.h.

2010-11-25 - 4723bc2 - 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 - 176a615 - 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 - 6bfc268 - lavf 52.85.0 - avformat.h
  Add av_append_packet().

2010-11-21 - a08d918 - lavc 52.97.0 - avcodec.h
  Add av_grow_packet().

2010-11-17 - 0985e1a - lavcore 0.13.0 - parseutils.h
  Add av_parse_color() declared in libavcore/parseutils.h.

2010-11-13 - cb2c971 - lavc 52.95.0 - AVCodecContext
  Add AVCodecContext.subtitle_header and AVCodecContext.subtitle_header_size
  fields.

2010-11-13 - 5aaea02 - lavfi 1.62.0 - avfiltergraph.h
  Make avfiltergraph.h public.

2010-11-13 - 4fcbb2a - 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 - d2af720 - 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 - 24de0ed - lavfi 1.59.0 - avfilter_free()
  Rename avfilter_destroy() to avfilter_free().
  This change breaks libavfilter API/ABI.

2010-11-07 - 1e80a0e - lavfi 1.58.0 - avfiltergraph.h
  Remove graphparser.h header, move AVFilterInOut and
  avfilter_graph_parse() declarations to libavfilter/avfiltergraph.h.

2010-11-07 - 7313132 - lavfi 1.57.0 - AVFilterInOut
  Rename field AVFilterInOut.filter to AVFilterInOut.filter_ctx.
  This change breaks libavfilter API.

2010-11-04 - 97dd1e4 - lavfi 1.56.0 - avfilter_graph_free()
  Rename avfilter_graph_destroy() to avfilter_graph_free().
  This change breaks libavfilter API/ABI.

2010-11-04 - e15aeea - lavfi 1.55.0 - avfilter_graph_alloc()
  Add avfilter_graph_alloc() to libavfilter/avfiltergraph.h.

2010-11-02 - 6f84cd1 - 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 - d63e456 - 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 - 262d1c5 - lavcore 0.10.0 - samplefmt.h
  Define enum AVSampleFormat in libavcore/samplefmt.h, deprecate enum
  SampleFormat.

2010-10-16 - 2a24df9 - lavfi 1.52.0 - avfilter_graph_config()
  Add the function avfilter_graph_config() in avfiltergraph.h.

2010-10-15 - 03700d3 - 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 - 867ae7a - lavfi 1.49.0 - AVFilterLink.time_base
  Add time_base field to AVFilterLink.

2010-09-27 - c85eef4 - lavu 50.31.0 - av_set_options_string()
  Move av_set_options_string() from libavfilter/parseutils.h to
  libavutil/opt.h.

2010-09-27 - acc0490 - 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 - 372e288 - lavu 50.30.0 - av_get_token()
  Move av_get_token() from libavfilter/parseutils.h to
  libavutil/avstring.h.

2010-09-26 - 635d4ae - lsws 0.12.0 - swscale.h
  Add the functions sws_alloc_context() and sws_init_context().

2010-09-26 - 6ed0404 - lavu 50.29.0 - opt.h
  Move libavcodec/opt.h to libavutil/opt.h.

2010-09-24 - 1c1c80f - 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
  enabling it for your app!.

2010-09-24 - f66eb58 - lavc 52.90.0 - av_opt_show2()
  Deprecate av_opt_show() in favor or av_opt_show2().

2010-09-14 - bc6f0af - lavu 50.27.0 - av_popcount()
  Add av_popcount() to libavutil/common.h.

2010-09-08 - c6c98d0 - lavu 50.26.0 - av_get_cpu_flags()
  Add av_get_cpu_flags().

2010-09-07 - 34017fd - lavcore 0.9.0 - av_image_copy()
  Add av_image_copy().

2010-09-07 - 9686abb - lavcore 0.8.0 - av_image_copy_plane()
  Add av_image_copy_plane().

2010-09-07 - 9b7269e - lavcore 0.7.0 - imgutils.h
  Adopt hierarchical scheme for the imgutils.h function names,
  deprecate the old names.

2010-09-04 - 7160bb7 - lavu 50.25.0 - AV_CPU_FLAG_*
  Deprecate the FF_MM_* flags defined in libavcodec/avcodec.h in favor
  of the AV_CPU_FLAG_* flags defined in libavutil/cpu.h.

2010-08-26 - 5da19b5 - lavc 52.87.0 - avcodec_get_channel_layout()
  Add avcodec_get_channel_layout() in audioconvert.h.

2010-08-20 - e344336 - lavcore 0.6.0 - av_fill_image_max_pixsteps()
  Rename av_fill_image_max_pixstep() to av_fill_image_max_pixsteps().

2010-08-18 - a6ddf8b - lavcore 0.5.0 - av_fill_image_max_pixstep()
  Add av_fill_image_max_pixstep() in imgutils.h.

2010-08-17 - 4f2d2e4 - lavu 50.24.0 - AV_NE()
  Add the AV_NE macro.

2010-08-17 - ad2c950 - lavfi 1.36.0 - audio framework
  Implement AVFilterBufferRefAudioProps struct for audio properties,
  get_audio_buffer(), filter_samples() functions and related changes.

2010-08-12 - 81c1eca - lavcore 0.4.0 - av_get_image_linesize()
  Add av_get_image_linesize() in imgutils.h.

2010-08-11 - c1db7bf - lavfi 1.34.0 - AVFilterBufferRef
  Resize data and linesize arrays in AVFilterBufferRef to 8.

  This change breaks libavfilter API/ABI.

2010-08-11 - 9f08d80 - lavc 52.85.0 - av_picture_data_copy()
  Add av_picture_data_copy in avcodec.h.

2010-08-11 - 84c0386 - lavfi 1.33.0 - avfilter_open()
  Change avfilter_open() signature:
  AVFilterContext *avfilter_open(AVFilter *filter, const char *inst_name) ->
  int avfilter_open(AVFilterContext **filter_ctx, AVFilter *filter, const char *inst_name);

  This change breaks libavfilter API/ABI.

2010-08-11 - cc80caf - lavfi 1.32.0 - AVFilterBufferRef
  Add a type field to AVFilterBufferRef, and move video specific
  properties to AVFilterBufferRefVideoProps.

  This change breaks libavfilter API/ABI.

2010-08-07 - 5d4890d - lavfi 1.31.0 - AVFilterLink
  Rename AVFilterLink fields:
  AVFilterLink.srcpic    ->  AVFilterLink.src_buf
  AVFilterLink.cur_pic   ->  AVFilterLink.cur_buf
  AVFilterLink.outpic    ->  AVFilterLink.out_buf

2010-08-07 - 7fce481 - lavfi 1.30.0
  Rename functions and fields:
  avfilter_(un)ref_pic       -> avfilter_(un)ref_buffer
  avfilter_copy_picref_props -> avfilter_copy_buffer_ref_props
  AVFilterBufferRef.pic      -> AVFilterBufferRef.buffer

2010-08-07 - ecc8dad - lavfi 1.29.0 - AVFilterBufferRef
  Rename AVFilterPicRef to AVFilterBufferRef.

2010-08-07 - d54e094 - lavfi 1.28.0 - AVFilterBuffer
  Move format field from AVFilterBuffer to AVFilterPicRef.

2010-08-06 - bf176f5 - lavcore 0.3.0 - av_check_image_size()
  Deprecate avcodec_check_dimensions() in favor of the function
  av_check_image_size() defined in libavcore/imgutils.h.

2010-07-30 - 56b5e9d - lavfi 1.27.0 - AVFilterBuffer
  Increase size of the arrays AVFilterBuffer.data and
  AVFilterBuffer.linesize from 4 to 8.

  This change breaks libavfilter ABI.

2010-07-29 - e7bd48a - lavcore 0.2.0 - imgutils.h
  Add functions av_fill_image_linesizes() and
  av_fill_image_pointers(), declared in libavcore/imgutils.h.

2010-07-27 - 126b638 - lavcore 0.1.0 - parseutils.h
  Deprecate av_parse_video_frame_size() and av_parse_video_frame_rate()
  defined in libavcodec in favor of the newly added functions
  av_parse_video_size() and av_parse_video_rate() declared in
  libavcore/parseutils.h.

2010-07-23 - 4485247 - lavu 50.23.0 - mathematics.h
  Add the M_PHI constant definition.

2010-07-22 - bdab614 - lavfi 1.26.0 - media format generalization
  Add a type field to AVFilterLink.

  Change the field types:
  enum PixelFormat format   -> int format   in AVFilterBuffer
  enum PixelFormat *formats -> int *formats in AVFilterFormats
  enum PixelFormat *format  -> int format   in AVFilterLink

  Change the function signatures:
  AVFilterFormats *avfilter_make_format_list(const enum PixelFormat *pix_fmts); ->
  AVFilterFormats *avfilter_make_format_list(const int *fmts);

  int avfilter_add_colorspace(AVFilterFormats **avff, enum PixelFormat pix_fmt); ->
  int avfilter_add_format    (AVFilterFormats **avff, int fmt);

  AVFilterFormats *avfilter_all_colorspaces(void); ->
  AVFilterFormats *avfilter_all_formats    (enum AVMediaType type);

  This change breaks libavfilter API/ABI.

2010-07-21 - aac6ca6 - lavcore 0.0.0
  Add libavcore.

2010-07-17 - b5c582f - lavfi 1.25.0 - AVFilterBuffer
  Remove w and h fields from AVFilterBuffer.

2010-07-17 - f0d77b2 - lavfi 1.24.0 - AVFilterBuffer
  Rename AVFilterPic to AVFilterBuffer.

2010-07-17 - 57fe80f - lavf 52.74.0 - url_fskip()
  Make url_fskip() return an int error code instead of void.

2010-07-11 - 23940f1 - lavc 52.83.0
  Add AVCodecContext.lpc_type and AVCodecContext.lpc_passes fields.
  Add AVLPCType enum.
  Deprecate AVCodecContext.use_lpc.

2010-07-11 - e1d7c88 - lavc 52.82.0 - avsubtitle_free()
  Add a function for free the contents of a AVSubtitle generated by
  avcodec_decode_subtitle.

2010-07-11 - b91d08f - lavu 50.22.0 - bswap.h and intreadwrite.h
  Make the bswap.h and intreadwrite.h API public.

2010-07-08 - ce1cd1c - lavu 50.21.0 - pixdesc.h
  Rename read/write_line() to av_read/write_image_line().

2010-07-07 - 4d508e4 - lavfi 1.21.0 - avfilter_copy_picref_props()
  Add avfilter_copy_picref_props().

2010-07-03 - 2d525ef - lavc 52.79.0
  Add FF_COMPLIANCE_UNOFFICIAL and change all instances of
  FF_COMPLIANCE_INOFFICIAL to use FF_COMPLIANCE_UNOFFICIAL.

2010-07-02 - 89eec74 - lavu 50.20.0 - lfg.h
  Export av_lfg_init(), av_lfg_get(), av_mlfg_get(), and av_bmg_get() through
  lfg.h.

2010-06-28 - a52e2c3 - lavfi 1.20.1 - av_parse_color()
  Extend av_parse_color() syntax, make it accept an alpha value specifier and
  set the alpha value to 255 by default.

2010-06-22 - 735cf6b - lavf 52.71.0 - URLProtocol.priv_data_size, priv_data_class
  Add priv_data_size and priv_data_class to URLProtocol.

2010-06-22 - ffbb289 - lavf 52.70.0 - url_alloc(), url_connect()
  Add url_alloc() and url_connect().

2010-06-22 - 9b07a2d - lavf 52.69.0 - av_register_protocol2()
  Add av_register_protocol2(), deprecating av_register_protocol().

2010-06-09 - 65db058 - lavu 50.19.0 - av_compare_mod()
  Add av_compare_mod() to libavutil/mathematics.h.

2010-06-05 - 0b99215 - lavu 50.18.0 - eval API
  Make the eval API public.

2010-06-04 - 31878fc - lavu 50.17.0 - AV_BASE64_SIZE
  Add AV_BASE64_SIZE() macro.

2010-06-02 - 7e566bb - lavc 52.73.0 - av_get_codec_tag_string()
  Add av_get_codec_tag_string().

2010-06-01 - 2b99142 - lsws 0.11.0 - convertPalette API
  Add sws_convertPalette8ToPacked32() and sws_convertPalette8ToPacked24().

2010-05-26 - 93ebfee - lavc 52.72.0 - CODEC_CAP_EXPERIMENTAL
  Add CODEC_CAP_EXPERIMENTAL flag.
  NOTE: this was backported to 0.6

2010-05-23 - 9977863 - lavu 50.16.0 - av_get_random_seed()
  Add av_get_random_seed().

2010-05-18 - 796ac23 - lavf 52.63.0 - AVFMT_FLAG_RTP_HINT
  Add AVFMT_FLAG_RTP_HINT as possible value for AVFormatContext.flags.
  NOTE: this was backported to 0.6

2010-05-09 - b6bc205 - lavfi 1.20.0 - AVFilterPicRef
  Add interlaced and top_field_first fields to AVFilterPicRef.

------------------------------8<-------------------------------------
                   0.6 branch was cut here
----------------------------->8--------------------------------------

2010-05-01 - 8e2ee18 - lavf 52.62.0 - probe function
  Add av_probe_input_format2 to API, it allows ignoring probe
  results below given score and returns the actual probe score.

2010-04-01 - 3dd6180 - lavf 52.61.0 - metadata API
  Add a flag for av_metadata_set2() to disable overwriting of
  existing tags.

2010-04-01 - 0fb49b5 - lavc 52.66.0
  Add avcodec_get_edge_width().

2010-03-31 - d103218 - lavc 52.65.0
  Add avcodec_copy_context().

2010-03-31 - 1a70d12 - lavf 52.60.0 - av_match_ext()
  Make av_match_ext() public.

2010-03-31 - 1149150 - lavu 50.14.0 - AVMediaType
  Move AVMediaType enum from libavcodec to libavutil.

2010-03-31 - 72415b2 - lavc 52.64.0 - AVMediaType
  Define AVMediaType enum, and use it instead of enum CodecType, which
  is deprecated and will be dropped at the next major bump.

2010-03-25 - 8795823 - lavu 50.13.0 - av_strerror()
  Implement av_strerror().

2010-03-23 - e1484eb - lavc 52.60.0 - av_dct_init()
  Support DCT-I and DST-I.

2010-03-15 - b8819c8 - lavf 52.56.0 - AVFormatContext.start_time_realtime
  Add AVFormatContext.start_time_realtime field.

2010-03-13 - 5bb5c1d - lavfi 1.18.0 - AVFilterPicRef.pos
  Add AVFilterPicRef.pos field.

2010-03-13 - 60c144f - lavu 50.12.0 - error.h
  Move error code definitions from libavcodec/avcodec.h to
  the new public header libavutil/error.h.

2010-03-07 - c709483 - lavc 52.56.0 - avfft.h
  Add public FFT interface.

2010-03-06 - ac6ef86 - lavu 50.11.0 - av_stristr()
  Add av_stristr().

2010-03-03 - 4b83fc0 - lavu 50.10.0 - av_tree_enumerate()
  Add av_tree_enumerate().

2010-02-07 - b687c1a - lavu 50.9.0 - av_compare_ts()
  Add av_compare_ts().

2010-02-05 - 3f3dc76 - lsws 0.10.0 - sws_getCoefficients()
  Add sws_getCoefficients().

2010-02-01 - ca76a11 - lavf 52.50.0 - metadata API
  Add a list of generic tag names, change 'author' -> 'artist',
  'year' -> 'date'.

2010-01-30 - 80a07f6 - lavu 50.8.0 - av_get_pix_fmt()
  Add av_get_pix_fmt().

2010-01-21 - 01cc47d - lsws 0.9.0 - sws_scale()
  Change constness attributes of sws_scale() parameters.

2010-01-10 - 3fb8e77 - lavfi 1.15.0 - avfilter_graph_config_links()
  Add a log_ctx parameter to avfilter_graph_config_links().

2010-01-07 - 8e9767f - lsws 0.8.0 - sws_isSupported{In,Out}put()
  Add sws_isSupportedInput() and sws_isSupportedOutput() functions.

2010-01-06 - c1d662f - lavfi 1.14.0 - avfilter_add_colorspace()
  Change the avfilter_add_colorspace() signature, make it accept an
  (AVFilterFormats **) rather than an (AVFilterFormats *) as before.

2010-01-03 - 4fd1f18 - lavfi 1.13.0 - avfilter_add_colorspace()
  Add avfilter_add_colorspace().

2010-01-02 - 8eb631f - lavf 52.46.0 - av_match_ext()
  Add av_match_ext(), it should be used in place of match_ext().

2010-01-01 - a1f547b - lavf 52.45.0 - av_guess_format()
  Add av_guess_format(), it should be used in place of guess_format().

2009-12-13 - a181981 - lavf 52.43.0 - metadata API
  Add av_metadata_set2(), AV_METADATA_DONT_STRDUP_KEY and
  AV_METADATA_DONT_STRDUP_VAL.

2009-12-13 - 277c733 - lavu 50.7.0 - avstring.h API
  Add av_d2str().

2009-12-13 - 02b398e - lavc 52.42.0 - AVStream
  Add avg_frame_rate.

2009-12-12 - 3ba69a1 - lavu 50.6.0 - av_bmg_next()
  Introduce the av_bmg_next() function.

2009-12-05 - a13a543 - lavfi 1.12.0 - avfilter_draw_slice()
  Add a slice_dir parameter to avfilter_draw_slice().

2009-11-26 - 4cc3f6a - lavfi 1.11.0 - AVFilter
  Remove the next field from AVFilter, this is not anymore required.

2009-11-25 - 1433c4a - lavfi 1.10.0 - avfilter_next()
  Introduce the avfilter_next() function.

2009-11-25 - 86a60fa - lavfi 1.9.0 - avfilter_register()
  Change the signature of avfilter_register() to make it return an
  int. This is required since now the registration operation may fail.

2009-11-25 - 74a0059 - lavu 50.5.0 - pixdesc.h API
  Make the pixdesc.h API public.

2009-10-27 - 243110f - lavfi 1.5.0 - AVFilter.next
  Add a next field to AVFilter, this is used for simplifying the
  registration and management of the registered filters.

2009-10-23 - cccd292 - lavfi 1.4.1 - AVFilter.description
  Add a description field to AVFilter.

2009-10-19 - 6b5dc05 - lavfi 1.3.0 - avfilter_make_format_list()
  Change the interface of avfilter_make_format_list() from
  avfilter_make_format_list(int n, ...) to
  avfilter_make_format_list(enum PixelFormat *pix_fmts).

2009-10-18 - 0eb4ff9 - lavfi 1.0.0 - avfilter_get_video_buffer()
  Make avfilter_get_video_buffer() recursive and add the w and h
  parameters to it.

2009-10-07 - 46c40e4 - lavfi 0.5.1 - AVFilterPic
  Add w and h fields to AVFilterPic.

2009-06-22 - 92400be - lavf 52.34.1 - AVFormatContext.packet_size
  This is now an unsigned int instead of a signed int.

2009-06-19 - a4276ba - lavc 52.32.0 - AVSubtitle.pts
  Add a pts field to AVSubtitle which gives the subtitle packet pts
  in AV_TIME_BASE. Some subtitle de-/encoders (e.g. XSUB) will
  not work right without this.

2009-06-03 - 8f3f2e0 - lavc 52.30.2 - AV_PKT_FLAG_KEY
  PKT_FLAG_KEY has been deprecated and will be dropped at the next
  major version. Use AV_PKT_FLAG_KEY instead.

2009-06-01 - f988ce6 - lavc 52.30.0 - av_lockmgr_register()
  av_lockmgr_register() can be used to register a callback function
  that lavc (and in the future, libraries that depend on lavc) can use
  to implement mutexes. The application should provide a callback function
  that implements the AV_LOCK_* operations described in avcodec.h.
  When the lock manager is registered, FFmpeg is guaranteed to behave
  correctly in a multi-threaded application.

2009-04-30 - ce1d9c8 - lavc 52.28.0 - av_free_packet()
  av_free_packet() is no longer an inline function. It is now exported.

2009-04-11 - 80d403f - lavc 52.25.0 - deprecate av_destruct_packet_nofree()
  Please use NULL instead. This has been supported since r16506
  (lavf > 52.23.1, lavc > 52.10.0).

2009-04-07 - 7a00bba - lavc 52.23.0 - avcodec_decode_video/audio/subtitle
  The old decoding functions are deprecated, all new code should use the
  new functions avcodec_decode_video2(), avcodec_decode_audio3() and
  avcodec_decode_subtitle2(). These new functions take an AVPacket *pkt
  argument instead of a const uint8_t *buf / int buf_size pair.

2009-04-03 - 7b09db3 - lavu 50.3.0 - av_fifo_space()
  Introduce the av_fifo_space() function.

2009-04-02 - fabd246 - lavc 52.23.0 - AVPacket
  Move AVPacket declaration from libavformat/avformat.h to
  libavcodec/avcodec.h.

2009-03-22 - 6e08ca9 - lavu 50.2.0 - RGB32 pixel formats
  Convert the pixel formats PIX_FMT_ARGB, PIX_FMT_RGBA, PIX_FMT_ABGR,
  PIX_FMT_BGRA, which were defined as macros, into enum PixelFormat values.
  Conversely PIX_FMT_RGB32, PIX_FMT_RGB32_1, PIX_FMT_BGR32 and
  PIX_FMT_BGR32_1 are now macros.
  avcodec_get_pix_fmt() now recognizes the "rgb32" and "bgr32" aliases.
  Re-sort the enum PixelFormat list accordingly.
  This change breaks API/ABI backward compatibility.

2009-03-22 - f82674e - lavu 50.1.0 - PIX_FMT_RGB5X5 endian variants
  Add the enum PixelFormat values:
  PIX_FMT_RGB565BE, PIX_FMT_RGB565LE, PIX_FMT_RGB555BE, PIX_FMT_RGB555LE,
  PIX_FMT_BGR565BE, PIX_FMT_BGR565LE, PIX_FMT_BGR555BE, PIX_FMT_BGR555LE.

2009-03-21 - ee6624e - lavu 50.0.0  - av_random*
  The Mersenne Twister PRNG implemented through the av_random* functions
  was removed. Use the lagged Fibonacci PRNG through the av_lfg* functions
  instead.

2009-03-08 - 41dd680 - lavu 50.0.0  - AVFifoBuffer
  av_fifo_init, av_fifo_read, av_fifo_write and av_fifo_realloc were dropped
  and replaced by av_fifo_alloc, av_fifo_generic_read, av_fifo_generic_write
  and av_fifo_realloc2.
  In addition, the order of the function arguments of av_fifo_generic_read
  was changed to match av_fifo_generic_write.
  The AVFifoBuffer/struct AVFifoBuffer may only be used in an opaque way by
  applications, they may not use sizeof() or directly access members.

2009-03-01 - ec26457 - lavf 52.31.0 - Generic metadata API
  Introduce a new metadata API (see av_metadata_get() and friends).
  The old API is now deprecated and should not be used anymore. This especially
  includes the following structure fields:
    - AVFormatContext.title
    - AVFormatContext.author
    - AVFormatContext.copyright
    - AVFormatContext.comment
    - AVFormatContext.album
    - AVFormatContext.year
    - AVFormatContext.track
    - AVFormatContext.genre
    - AVStream.language
    - AVStream.filename
    - AVProgram.provider_name
    - AVProgram.name
    - AVChapter.title