API changes, most recent first:
-2011-08-22 - xxxxxx - lavf 53.10.0
+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.
+
+2011-10-27 - 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 - xxxxxx - lavu 51.13.0
+2011-08-20 - 69e2c1a - lavu 51.13.0
Add av_get_media_type_string().
-2011-08-14 - xxxxxx - lavu 51.12.0
+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-xx - xxxxxxx - lavf 53.4.0
+2011-08-16 - 48f9e45 - lavf 53.8.0
Add avformat_query_codec().
-2011-08-xx - xxxxxxx - lavc 53.8.0
+2011-08-16 - bca06e7 - lavc 53.11.0
Add avcodec_get_type().
-2011-08-06 - 2f63440 - lavf 53.4.0
+2011-08-06 - 2f63440 - lavf 53.7.0
Add error_recognition to AVFormatContext.
-2011-08-02 - 9d39cbf - lavc 53.7.1
+2011-08-02 - 9d39cbf - lavc 53.9.1
Add AV_PKT_FLAG_CORRUPT AVPacket flag.
2011-07-16 - b57df29 - lavfi 2.27.0
avfilter_set_common_packing_formats()
avfilter_all_packing_formats()
-2011-07-10 - a67c061 - lavf 53.3.0
+2011-07-10 - a67c061 - lavf 53.6.0
Add avformat_find_stream_info(), deprecate av_find_stream_info().
-2011-07-10 - 0b950fe - lavc 53.6.0
+2011-07-10 - 0b950fe - lavc 53.8.0
Add avcodec_open2(), deprecate avcodec_open().
2011-07-01 - b442ca6 - lavf 53.5.0 - avformat.h
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
d9d86e0 rename url_fprintf -> avio_printf
59f65d9 deprecate url_setbufsize
3e68b3b deprecate url_ferror
- 66e5b1d deprecate url_feof
e8bb2e2 deprecate url_fget_max_packet_size
76aa876 rename url_fsize -> avio_size
e519753 deprecate url_fgetc