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