API changes, most recent first:
+2014-04-xx - xxxxxxx - avcodec.h
+ Deprecate CODEC_FLAG_INPUT_PRESERVED. Its functionality is replaced by passing
+ reference-counted frames to encoders.
+
2014-04-29 - 1bf6396 - lavc 55.60.100 - avcodec.h
Add AVCodecDescriptor.mime_types field.