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: 2009-10-18 libavformat: ? libpostproc: ? libswscale: ? libavutil: 2009-03-08 API changes, most recent first: 2010-04-01 - r22806 - lavf 52.61.0 - metadata API Add a flag for av_metadata_set2() to disable overwriting of existing tags. 2010-04-01 - r22753 - lavc 52.66.0 Add avcodec_get_edge_width() 2010-03-31 - r22750 - lavc 52.65.0 Add avcodec_copy_context(). 2010-03-31 - r22748 - lavf 52.60.0 - av_match_ext() Make av_match_ext() public. 2010-03-31 - r22736 - lavu 50.14.0 - AVMediaType Move AVMediaType enum from libavcodec to libavutil. 2010-03-31 - r22735 - lavc 52.64.0 - AVMediaType Define AVMediaType enum, and use it instead of enum CodecType, which is deprecated and will be dropped at the next major bump. 2010-03-25 - r22684 - lavu 50.13.0 - av_strerror() Implement av_strerror(). 2010-03-23 - r22649 - lavc 52.60.0 - av_dct_init() Support DCT-I and DST-I 2010-03-15 - r22540 - lavf 52.56.0 - AVFormatContext.start_time_realtime Add AVFormatContext.start_time_realtime field. 2010-03-13 - r22506 - lavfi 1.18.0 - AVFilterPicRef.pos Add AVFilterPicRef.pos field. 2010-03-13 - r22501 - lavu 50.12.0 - error.h Move error code definitions from libavcodec/avcodec.h to the new public header libavutil/error.h. 2010-03-07 - r22291 - lavc 52.56.0 - avfft.h Add public FFT interface. 2010-03-06 - r22251 - lavu 50.11.0 - av_stristr() Add av_stristr(). 2010-03-03 - r22174 - lavu 50.10.0 - av_tree_enumerate() Add av_tree_enumerate(). 2010-02-07 - r21673 - lavu 50.9.0 - av_compare_ts() Add av_compare_ts(). 2010-02-05 - r30513 - lsws 0.10.0 - sws_getCoefficients() Add sws_getCoefficients(). 2010-02-01 - r21587 - lavf 52.50.0 - metadata API Add a list of generic tag names, change 'author' -> 'artist', 'year' -> 'date'. 2010-01-30 - r21545 - lavu 50.8.0 - av_get_pix_fmt() Add av_get_pix_fmt(). 2010-01-21 - r30381 - lsws 0.9.0 - sws_scale Change constness attributes of sws_scale() parameters. 2010-01-10 - r21121 - lavfi 1.15.0 - avfilter_graph_config_links() Add a log_ctx parameter to avfilter_graph_config_links(). 2010-01-07 - r30236 - lsws 0.8.0 - sws_isSupported{In,Out}put Add sws_isSupportedInput() and sws_isSupportedOutput() functions. 2010-01-06 - r21035 - lavfi 1.14.0 - avfilter_add_colorspace() Change the avfilter_add_colorspace() signature, make it accept an (AVFilterFormats **) rather than an (AVFilterFormats *) as before. 2010-01-03 - r21007 - lavfi 1.13.0 - avfilter_add_colorspace() Add avfilter_add_colorspace(). 2010-01-02 - r20998 - lavf 52.46.0 - av_match_ext() Add av_match_ext(), it should be used in place of match_ext(). 2010-01-01 - r20991 - lavf 52.45.0 - av_guess_format() Add av_guess_format(), it should be used in place of guess_format(). 2009-12-13 - r20834 - lavf 52.43.0 - metadata API Add av_metadata_set2(), AV_METADATA_DONT_STRDUP_KEY and AV_METADATA_DONT_STRDUP_VAL. 2009-12-13 - r20829 - lavu 50.7.0 - avstring.h API Add av_d2str(). 2009-12-13 - r20826 - lavc 52.42.0 - AVStream Add avg_frame_rate. 2009-12-12 - r20808 - lavu 50.6.0 - av_bmg_next() Introduce the av_bmg_next() function. 2009-12-05 - r20734 - lavfi 1.12.0 - avfilter_draw_slice() Add a slice_dir parameter to avfilter_draw_slice(). 2009-11-26 - r20611 - lavfi 1.11.0 - AVFilter Remove the next field from AVFilter, this is not anymore required. 2009-11-25 - r20607 - lavfi 1.10.0 - avfilter_next() Introduce the avfilter_next() function. 2009-11-25 - r20605 - lavfi 1.9.0 - avfilter_register() Change the signature of avfilter_register() to make it return an int. This is required since now the registration operation may fail. 2009-11-25 - r20603 - lavu 50.5.0 - pixdesc.h API Make the pixdesc.h API public. 2009-10-27 - r20385 - lavfi 1.5.0 - AVFilter.next Add a next field to AVFilter, this is used for simplifying the registration and management of the registered filters. 2009-10-23 - r20356 - lavfi 1.4.1 - AVFilter.description Add a description field to AVFilter. 2009-10-19 - r20302 - lavfi 1.3.0 - avfilter_make_format_list() Change the interface of avfilter_make_format_list() from avfilter_make_format_list(int n, ...) to avfilter_make_format_list(enum PixelFormat *pix_fmts). 2009-10-18 - r20272 - lavfi 1.0.0 - avfilter_get_video_buffer() Make avfilter_get_video_buffer() recursive and add the w and h parameters to it. 2009-10-07 - r20189 - lavfi 0.5.1 - AVFilterPic Add w and h fields to AVFilterPic. 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 Add a pts field to AVSubtitle which gives the subtitle 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 at 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 that implements the AV_LOCK_* operations described in avcodec.h. When the lock manager is registered, FFmpeg is guaranteed to behave correctly 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 Convert the pixel formats PIX_FMT_ARGB, PIX_FMT_RGBA, PIX_FMT_ABGR, PIX_FMT_BGRA, which were defined as macros, into enum PixelFormat values. Conversely PIX_FMT_RGB32, PIX_FMT_RGB32_1, PIX_FMT_BGR32 and PIX_FMT_BGR32_1 are now macros. avcodec_get_pix_fmt() now recognizes 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 was 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