API changes, most recent first:
-2011-09-22 - xxxxxxx - lavu 51.17.0
+2011-12-08 - xxxxxxx - lavu 51.31.0
+ Add av_log_format_line.
+
+2011-12-03 - xxxxxxx - lavu 51.30.0
+ Add AVERROR_BUG.
+
+2011-xx-xx - xxxxxxx - 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-xx-xx - xxxxxxx - 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-xx-xx - xxxxxxx - 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_uninit()
+
+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 - xxxxxxx - lavc 53.16.0
+2011-09-18 - 645cebb - lavc 53.16.0
Add showall flag2
-2011-09-16 - xxxxxxx - lavfi 2.42.0
+2011-09-16 - ea8de10 - lavfi 2.42.0
Add avfilter_all_channel_layouts.
-2011-09-16 - xxxxxxx - lavfi 2.41.0
+2011-09-16 - 9899037 - lavfi 2.41.0
Rename avfilter_all_* function names to avfilter_make_all_*.
In particular, apply the renames:
avfilter_all_channel_layouts -> avfilter_make_all_channel_layouts
avfilter_all_packing_formats -> avfilter_make_all_packing_formats
-2011-09-12 - xxxxxxx - lavfi 2.40.0
+2011-09-12 - 4381bdd - lavfi 2.40.0
Change AVFilterBufferRefAudioProps.sample_rate type from uint32_t to int.
-2011-09-12 - xxxxxxx - lavfi 2.40.0
+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 - xxxxxxx - lavfi 2.39.0
+2011-09-06 - 4f7dfe1 - lavfi 2.39.0
Rename libavfilter/vsink_buffer.h to libavfilter/buffersink.h.
-2011-09-06 - xxxxxxx - lavfi 2.38.0
+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-xx - xxxxxxx - lavu 51.16.0
+2011-09-04 - 61e2e29 - lavu 51.16.0
Add av_asprintf().
2011-08-22 - dacd827 - lavf 53.10.0
Add av_get_bytes_per_sample() in libavutil/samplefmt.h.
Deprecate av_get_bits_per_sample_fmt().
-2011-06-xx - b39b062 - lavu 51.8.0 - opt.h
+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