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ffmpeg / doc / APIchanges @ 0eb4ff9e

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Never assume the API of libav* to be stable unless at least 1 week has passed since
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the last major version increase.
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The last version increases were:
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libavcodec:  ?
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libavdevice: ?
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libavfilter: ?
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libavformat: ?
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libpostproc: ?
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libswscale:  ?
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libavutil:   2009-03-08
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API changes, most recent first:
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2009-10-07 - r20189 - lavfi 0.5.1 - AVFilterPic
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  Added w and h fields to AVFilterPic.
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2009-06-22 - r19250 - lavf 52.34.1 - AVFormatContext.packet_size
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  This is now an unsigned int instead of a signed int.
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2009-06-19 - r19222 - lavc 52.32.0 - AVSubtitle.pts
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  Added a pts field to AVSubtitle which gives the subtitle's packet
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  PTS in AV_TIME_BASE. Some subtitle de-/encoders (e.g. XSUB) will
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  not work right without this.
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2009-06-03 - r19078 - lavc 52.30.2 - AV_PKT_FLAG_KEY
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  PKT_FLAG_KEY has been deprecated and will be dropped for the next
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  major version. Use AV_PKT_FLAG_KEY instead.
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2009-06-01 - r19025 - lavc 52.30.0 - av_lockmgr_register()
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  av_lockmgr_register() can be used to register a callback function
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  that lavc (and in the future, libraries that depend on lavc) can use
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  to implement mutexes. The application should provide a callback function
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  the implements the AV_LOCK_* operations described in avcodec.h.
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  When the lock manager is registered FFmpeg is guaranteed to behave
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  correct also in a multi-threaded application.
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2009-04-30 - r18719 - lavc 52.28.0 - av_free_packet
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  av_free_packet() is no longer an inline function. It is now exported.
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2009-04-11 - r18431 - lavc 52.25.0 - deprecate av_destruct_packet_nofree
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  Please use NULL instead. This has been supported since r16506
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  (lavf > 52.23.1, lavc > 52.10.0).
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2009-04-07 - r18351 - lavc 52.23.0 - avcodec_decode_video/audio/subtitle
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  The old decoding functions are deprecated, all new code should use the
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  new functions avcodec_decode_video2(), avcodec_decode_audio3() and
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  avcodec_decode_subtitle2(). These new functions take an AVPacket *pkt
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  argument instead of a const uint8_t *buf / int buf_size pair.
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2009-04-03 - r18321 - lavu 50.3.0 - av_fifo_space
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  Introduce the av_fifo_space() function.
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2009-04-02 - r18317 - lavc 52.23.0 - AVPacket
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  Move AVPacket declaration from libavformat/avformat.h to
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  libavcodec/avcodec.h.
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2009-03-22 - r18163 - lavu 50.2.0 - RGB32 pixel formats
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  Make the pixel formats: PIX_FMT_ARGB, PIX_FMT_RGBA, PIX_FMT_ABGR,
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  PIX_FMT_BGRA, which were defined as macros, defined as enum
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  PixelFormat values, and viceversa make PIX_FMT_RGB32,
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  PIX_FMT_RGB32_1, PIX_FMT_BGR32, PIX_FMT_BGR32_1 defined as macros.
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  Also make avcodec_get_pix_fmt() recognize the "rgb32" and "bgr32"
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  aliases.
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  Re-sort the enum PixelFormat list accordingly.
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  This change breaks API/ABI backward compatibility.
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2009-03-22 - r18133 - lavu 50.1.0 - PIX_FMT_RGB5X5 endian variants
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  Add the enum PixelFormat values:
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  PIX_FMT_RGB565BE, PIX_FMT_RGB565LE, PIX_FMT_RGB555BE, PIX_FMT_RGB555LE,
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  PIX_FMT_BGR565BE, PIX_FMT_BGR565LE, PIX_FMT_BGR555BE, PIX_FMT_BGR555LE.
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2009-03-21 - r18116 - lavu 50.0.0  - av_random*
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  The Mersenne Twister PRNG implemented through the av_random* functions
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  was removed. Use the lagged Fibonacci PRNG through the av_lfg* functions
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  instead.
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2009-03-08 - r17869 - lavu 50.0.0  - AVFifoBuffer
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  av_fifo_init, av_fifo_read, av_fifo_write and av_fifo_realloc were dropped
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  and replaced by av_fifo_alloc, av_fifo_generic_read, av_fifo_generic_write
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  and av_fifo_realloc2.
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  In addition, the order of the function arguments of av_fifo_generic_read
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  were changed to match av_fifo_generic_write.
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  The AVFifoBuffer/struct AVFifoBuffer may only be used in an opaque way by
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  applications, they may not use sizeof() or directly access members.
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2009-03-01 - r17682 - lavf 52.31.0 - Generic metadata API
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  Introduce a new metadata API (see av_metadata_get() and friends).
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  The old API is now deprecated and should not be used anymore. This especially
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  includes the following structure fields:
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    - AVFormatContext.title
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    - AVFormatContext.author
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    - AVFormatContext.copyright
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    - AVFormatContext.comment
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    - AVFormatContext.album
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    - AVFormatContext.year
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    - AVFormatContext.track
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    - AVFormatContext.genre
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    - AVStream.language
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    - AVStream.filename
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    - AVProgram.provider_name
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    - AVProgram.name
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    - AVChapter.title