Never assume the API of libav* to be stable unless at least 1 week has passed sincethe last major version increase.The last version increases were:libavcodec:  ?libavdevice: ?libavfilter: ?libavformat: ?libpostproc: ?libswscale:  ?libavutil:   2009-03-08  API changes, most recent first: 2009-04-03 - 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 - 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