API changes, most recent first:
+2009-06-22 - r19250 - lavf 52.34.1 - AVFormatContext.packet_size
+ This is now an unsigned int instead of a signed int.
+
+2009-06-19 - r19222 - lavc 52.32.0 - AVSubtitle.pts
+ Added a pts field to AVSubtitle which gives the subtitle's packet
+ PTS in AV_TIME_BASE. Some subtitle de-/encoders (e.g. XSUB) will
+ not work right without this.
+
+2009-06-03 - r19078 - lavc 52.30.2 - AV_PKT_FLAG_KEY
+ PKT_FLAG_KEY has been deprecated and will be dropped for the next
+ major version. Use AV_PKT_FLAG_KEY instead.
+
+2009-06-01 - r19025 - lavc 52.30.0 - av_lockmgr_register()
+ av_lockmgr_register() can be used to register a callback function
+ that lavc (and in the future, libraries that depend on lavc) can use
+ to implement mutexes. The application should provide a callback function
+ the implements the AV_LOCK_* operations described in avcodec.h.
+ When the lock manager is registered FFmpeg is guaranteed to behave
+ correct also in a multi-threaded application.
+
+2009-04-30 - r18719 - lavc 52.28.0 - av_free_packet
+ av_free_packet() is no longer an inline function. It is now exported.
+
+2009-04-11 - r18431 - lavc 52.25.0 - deprecate av_destruct_packet_nofree
+ Please use NULL instead. This has been supported since r16506
+ (lavf > 52.23.1, lavc > 52.10.0).
+
+2009-04-07 - r18351 - lavc 52.23.0 - avcodec_decode_video/audio/subtitle
+ The old decoding functions are deprecated, all new code should use the
+ new functions avcodec_decode_video2(), avcodec_decode_audio3() and
+ avcodec_decode_subtitle2(). These new functions take an AVPacket *pkt
+ argument instead of a const uint8_t *buf / int buf_size pair.
+
2009-04-03 - r18321 - lavu 50.3.0 - av_fifo_space
Introduce the av_fifo_space() function.