Never assume the API of libav* to be stable unless at least 1 week has passed since the last major version increase. The last version increases were: libavcodec: ? libavdevice: ? libavfilter: ? libavformat: ? libpostproc: ? libswscale: ? libavutil: 2009-03-08 API changes, most recent first: 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. 2009-04-02 - r18317 - lavc 52.23.0 - AVPacket Move AVPacket declaration from libavformat/avformat.h to libavcodec/avcodec.h. 2009-03-22 - r18163 - lavu 50.2.0 - RGB32 pixel formats Make the pixel formats: PIX_FMT_ARGB, PIX_FMT_RGBA, PIX_FMT_ABGR, PIX_FMT_BGRA, which were defined as macros, defined as enum PixelFormat values, and viceversa make PIX_FMT_RGB32, PIX_FMT_RGB32_1, PIX_FMT_BGR32, PIX_FMT_BGR32_1 defined as macros. Also make avcodec_get_pix_fmt() recognize the "rgb32" and "bgr32" aliases. Re-sort the enum PixelFormat list accordingly. This change breaks API/ABI backward compatibility. 2009-03-22 - r18133 - lavu 50.1.0 - PIX_FMT_RGB5X5 endian variants Add the enum PixelFormat values: PIX_FMT_RGB565BE, PIX_FMT_RGB565LE, PIX_FMT_RGB555BE, PIX_FMT_RGB555LE, PIX_FMT_BGR565BE, PIX_FMT_BGR565LE, PIX_FMT_BGR555BE, PIX_FMT_BGR555LE. 2009-03-21 - r18116 - lavu 50.0.0 - av_random* The Mersenne Twister PRNG implemented through the av_random* functions was removed. Use the lagged Fibonacci PRNG through the av_lfg* functions instead. 2009-03-08 - r17869 - lavu 50.0.0 - AVFifoBuffer av_fifo_init, av_fifo_read, av_fifo_write and av_fifo_realloc were dropped and replaced by av_fifo_alloc, av_fifo_generic_read, av_fifo_generic_write and av_fifo_realloc2. In addition, the order of the function arguments of av_fifo_generic_read were changed to match av_fifo_generic_write. The AVFifoBuffer/struct AVFifoBuffer may only be used in an opaque way by applications, they may not use sizeof() or directly access members. 2009-03-01 - r17682 - lavf 52.31.0 - Generic metadata API Introduce a new metadata API (see av_metadata_get() and friends). The old API is now deprecated and should not be used anymore. This especially includes the following structure fields: - AVFormatContext.title - AVFormatContext.author - AVFormatContext.copyright - AVFormatContext.comment - AVFormatContext.album - AVFormatContext.year - AVFormatContext.track - AVFormatContext.genre - AVStream.language - AVStream.filename - AVProgram.provider_name - AVProgram.name - AVChapter.title