API changes, most recent first:
+2011-xx-xx - xxxxxxx - 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 - xxxxxxx - lavu 51.17.0
+ Add av_x_if_null().
+
2011-09-18 - xxxxxxx - lavc 53.16.0
Add showall flag2
2011-08-20 - 69e2c1a - lavu 51.13.0
Add av_get_media_type_string().
-2011-08-xx - xxxxxxx - lavc 53.13.0
+2011-09-03 - fb4ca26 - lavc 53.13.0
lavf 53.11.0
lsws 2.1.0
Add {avcodec,avformat,sws}_get_class().
-2011-08-xx - xxxxxxx - lavu 51.15.0
+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 - 48f9e45 - lavf 53.8.0
+2011-08-16 - 48f9e45 - lavf 53.8.0
Add avformat_query_codec().
-2011-08-xx - bca06e7 - lavc 53.11.0
+2011-08-16 - bca06e7 - lavc 53.11.0
Add avcodec_get_type().
2011-08-06 - 2f63440 - lavf 53.7.0