FFmpeg/doc/APIchanges

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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