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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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2009-04-03 - 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 - 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 50.2.0  - 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