APIchanges

20090308 - 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.
  The AVFifoBuffer/struct AVFifoBuffer may only be used in an opaque way by applications,
  they may not use sizeof() or directly access members.

20090301 - r17682 - lavf 52.31.0 - Generic metadata API
  This version introduces a new metadata API (see av_metadata_get() and friends).
  The old API is now deprecated and shouldn't 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