API changes, most recent first:
+2015-xx-xx - xxxxxxx - lavc 56.51.100 - avcodec.h
+ Add AV_PKT_DATA_QUALITY_STATS to export the quality value, PSNR, and pict_type
+ of an AVPacket.
+
+2015-07-16 - xxxxxxxx - lavc 56.49.100
+ Add av_codec_get_codec_properties(), FF_CODEC_PROPERTY_LOSSLESS
+ and FF_CODEC_PROPERTY_CLOSED_CAPTIONS
+
2015-xx-xx - xxxxxxx - lavu 56.15.0
Add av_version_info().