The last version increases were:
libavcodec: 2012-01-27
libavdevice: 2011-04-18
-libavfilter: 2011-04-18
+libavfilter: 2012-06-22
libavformat: 2012-01-27
-libavresample: 2012-04-24
+libavresample: 2012-10-05
libswscale: 2011-06-20
-libavutil: 2011-04-18
+libavutil: 2012-10-22
API changes, most recent first:
+2012-xx-xx - xxxxxxx - lavu 52.2.0 - audioconvert.h
+ Rename audioconvert.h to channel_layout.h. audioconvert.h is now deprecated.
+
+2012-xx-xx - xxxxxxx - lavu 52.1.0 - intmath.h
+ Add av_ctz() for trailing zero bit count
+
+2012-10-18 - xxxxxxx - lavu 51.45.0 - error.h
+ Add AVERROR_EXPERIMENTAL
+
+2012-10-12 - xxxxxxx - 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-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()
2012-04-05 - 5cc51a5 - lavu 51.26.0 - audioconvert.h
Add av_get_default_channel_layout()
+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
+
2012-03-06 - 4d851f8 - lavu 51.25.0 - cpu.h
Add av_set_cpu_flags_mask().
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