API changes, most recent first:
+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.