API changes, most recent first:
+2016-04-27 - xxxxxxx - lavu 55.23.100 - log.h
+ Add a new function av_log_format_line2() which returns number of bytes
+ written to the target buffer.
+
2016-xx-xx - xxxxxxx - lavc 57.37.100 - avcodec.h
Add a new audio/video encoding and decoding API with decoupled input
and output -- avcodec_send_packet(), avcodec_receive_frame(),
2016-xx-xx - xxxxxxx - lavc 57.15.0 - avcodec.h
Add a new bitstream filtering API working with AVPackets.
- Deprecate the old bistream filtering API.
+ Deprecate the old bitstream filtering API.
2016-xx-xx - xxxxxxx - lavfi 6.42.0 - avfilter.h
Add AVFilterContext.hw_device_ctx.