since the last major version increase.
The last version increases were:
-libavcodec: 2011-04-18
+libavcodec: 2012-01-27
libavdevice: 2011-04-18
libavfilter: 2011-04-18
-libavformat: 2011-04-18
+libavformat: 2012-01-27
libpostproc: 2011-04-18
libswscale: 2011-06-20
libavutil: 2011-04-18
API changes, most recent first:
+2012-02-21 - xxxxxxx - lavc 54.4.100
+ Add av_get_pcm_codec() function.
+
+2012-02-16 - xxxxxxx - libswr 0.7.100
+ Add swr_set_matrix() function.
+
+2012-02-09 - xxxxxxx - lavu 51.39.100
+ Add a new installed header libavutil/timestamp.h with timestamp
+ utilities.
+
+2012-02-06 - xxxxxxx - lavu 51.38.100
+ Add av_parse_ratio() function to parseutils.h.
+
+2012-02-06 - xxxxxxx - lavu 51.38.100
+ Add AV_LOG_MAX_OFFSET macro to log.h.
+
+2012-02-02 - xxxxxxx - lavu 51.37.100
+ Add public timecode helpers.
+
+2012-01-24 - xxxxxxx - lavfi 2.60.100
+ Add avfilter_graph_dump.
+
+2012-xx-xx - lavc 54.8.0
+ xxxxxxx Add av_get_exact_bits_per_sample()
+ xxxxxxx Add av_get_audio_frame_duration()
+
+2012-03-xx - xxxxxxx - lavc 54.7.0 - avcodec.h
+ Add av_codec_is_encoder/decoder().
+
+2012-xx-xx - xxxxxxx - lavc 54.3.0 - avcodec.h
+ Add av_packet_shrink_side_data.
+
+2012-xx-xx - xxxxxxx - 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
+
+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().
+
+2012-01-31 - af08d9a - lavc 54.01.0
+ Add avcodec_is_open() function.
+
+2012-01-30 - 8b93312 - lavu 51.22.0 - intfloat.h
+ Add a new installed header libavutil/intfloat.h with int/float punning
+ functions.
+
+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.
Add av_toupper()/av_tolower()
2011-11-05 - b6d08f4 - lavf 53.13.0
- Add avformat_network_init()/avformat_network_uninit()
+ Add avformat_network_init()/avformat_network_deinit()
2011-10-27 - 512557b - lavc 53.15.0
Remove avcodec_parse_frame.
2011-07-10 - 0b950fe - lavc 53.8.0
Add avcodec_open2(), deprecate avcodec_open().
+ 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().