API changes, most recent first:
+2010-01-30 - r21545 - lavu 50.8.0 - av_get_pix_fmt()
+ Add av_get_pix_fmt().
+
+2010-01-10 - r21121 - lavfi 1.15.0 - avfilter_graph_config_links()
+ Add a log_ctx parameter to avfilter_graph_config_links().
+
+2010-01-07 - r30236 - lsws 0.8.0 - sws_isSupported{In,Out}put
+ Add sws_isSupportedInput and sws_isSupportedOutput() functions.
+
+2010-01-06 - r21035 - lavfi 1.14.0 - avfilter_add_colorspace()
+ Change the avfilter_add_colorspace() signature, make it accept an
+ (AVFilterFormats **) rather than an (AVFilterFormats *) as before.
+
+2010-01-03 - r21007 - lavfi 1.13.0 - avfilter_add_colorspace()
+ Add avfilter_add_colorspace().
+
+2010-01-02 - r20998 - lavf 52.46.0 - av_match_ext()
+ Add av_match_ext(), it should be used in place of match_ext().
+
+2010-01-01 - r20991 - lavf 52.45.0 - av_guess_format()
+ Add av_guess_format(), it should be used in place of guess_format().
+
2009-12-13 - r20834 - lavf 52.43.0 - metadata API
Add av_metadata_set2(), AV_METADATA_DONT_STRDUP_KEY and AV_METADATA_DONT_STRDUP_VAL.